【java_wxid项目】【第十六章】【Spring Cloud Alibaba Sentinel集成】

java_wxid   
├── demo                                                            // 演示模块
│     └── 模块名称：apache-mybatis-demo模块                            //Apache Mybatis集成（已实现并有博文总结）
│     └── 模块名称：apache-shardingsphere-demo模块                     //Apache ShardingSphere集成（已实现并有博文总结）
│     └── 模块名称：design-demo模块                                    //设计模式实战落地（已实现并有博文总结）
│     └── 模块名称：elasticsearch-demo模块                             //ElasticSearch集成（已实现并有博文总结）
│     └── 模块名称：mongodb-demo模块                                   //MongoDB集成（已实现并有博文总结）
│     └── 模块名称：redis-demo模块                                     //Redis集成（已实现并有博文总结）
│     └── 模块名称：spring-boot-demo模块                               //Spring Boot快速构建应用（已实现并有博文总结）
│     └── 模块名称：spring-cloud-alibaba-nacos-demo模块                //Spring Cloud Alibaba Nacos集成（已实现并有博文总结）
│     └── 模块名称：spring-cloud-alibaba-seata-demo模块                //Spring Cloud Alibaba Seata集成（已实现并有博文总结）
│     └── 模块名称：spring-cloud-alibaba-sentinel-demo模块             //Spring Cloud Alibaba Sentinel集成（已实现并有博文总结）
│     └── 模块名称：spring-cloud-gateway-demo模块                      //Spring Cloud Gateway集成（已实现并有博文总结）
│     └── 模块名称：spring-cloud-hystrix-demo模块                      //Spring Cloud Hystrix集成（已实现并有博文总结）
│     └── 模块名称：spring-cloud-open-feign-demo模块                   //Spring Cloud Open Feign集成（已实现并有博文总结）
│     └── 模块名称：spring-cloud-ribbon-demo模块                       //Spring Cloud Ribbon集成（已实现并有博文总结）
│     └── 模块名称：spring-cloud-security-oauth2-demo模块              //Spring Cloud Security Oauth2集成（已实现并有博文总结）
│     └── 模块名称：spring-cloud-security-oauth2-sso-client-demo模块   //Spring Cloud Security Oauth2集成（已实现并有博文总结）
│     └── 模块名称：spring-cloud-skywalking-demo模块                   //Spring Cloud Skywalking集成（已实现并有博文总结）
│     └── 模块名称：spring-cloud-stream-demo模块                       //Spring Cloud Stream集成（已实现并有博文总结）
│     └── 模块名称：swagger-demo模块                                   //springfox-swagger2集成（已实现并有博文总结）
│     └── 模块名称：xxl-job模块                                        //xxl-job集成（已实现并有博文总结）
│     └── 模块名称：apache-spark-demo模块                              //Apache Spark集成
│     └── 模块名称：etl-hdfs-hive-hbase-demo模块                       //ETL、HDFS、Hive、Hbase集成
│     └── 模块名称：ddd-mode-demo模块                                  //DDD领域设计
│     └── 模块名称：netty-demo模块                                     //Netty集成
│     └── 模块名称：vue-demo模块                                       //前端vue集成
├── document                                                        // 文档
│     └── JavaKnowledgeDocument                                     //java知识点
│           └── java基础知识点.md                     
│           └── mq知识点.md
│           └── mysql知识点.md
│           └── redis知识点.md
│           └── springcould知识点.md
│           └── spring知识点.md
│     └── FounderDocument                                           //创始人
│           └── 创始人.md

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>spring-cloud-alibaba-sentinel-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-cloud-alibaba-sentinel-demo</name>
    <description>Demo project for Spring Boot</description>
    <!--    属性配置-->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <!--引入 Spring Boot、Spring Cloud、Spring Cloud Alibaba 三者 BOM 文件，进行依赖版本的管理，防止不兼容。
        在 https://dwz.cn/mcLIfNKt 文章中，Spring Cloud Alibaba 开发团队推荐了三者的依赖关系-->
        <spring.boot.version>2.3.12.RELEASE</spring.boot.version>
        <spring.cloud.version>Hoxton.SR12</spring.cloud.version>
        <spring.cloud.alibaba.version>2.2.7.RELEASE</spring.cloud.alibaba.version>
    </properties>
    <dependencies>
        <!--        代表web模块，在这个模块中含了许多JAR包，有spring相关的jar，内置tomcat服务器，jackson等，这些web项目中常用的的功能都会自动引入-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>2.4.5</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>2.4.1</version>
        </dependency>
        <!--        druid驱动-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.23</version>
        </dependency>
        <!--        mysql连接-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.22</version>
        </dependency>
        <!--        mybatis的一个库-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.2</version>
        </dependency>
        <!-- Alibaba Nacos 配置 -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
        <!--        在SpringBoot 2.4.x的版本之后，对于bootstrap.properties/bootstrap.yaml配置文件(我们合起来成为Bootstrap配置文件)的支持，其实这个jar包里什么都没有，就只有一个标识类Marker，用来标识要开启Bootstrap配置文件的支持，由于父类用了2.5.6版本需要导入如下的依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bootstrap</artifactId>
            <version>3.1.0</version>
        </dependency>
        <!--openfeign客户端依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-openfeign-core</artifactId>
            <version>2.2.6.RELEASE</version>
        </dependency>
        <!--引入HttpClient依赖-->
        <dependency>
            <groupId>io.github.openfeign</groupId>
            <artifactId>feign-httpclient</artifactId>
        </dependency>
        <!-- 引入Feign Slf4j -->
        <dependency>
            <groupId>com.netflix.feign</groupId>
            <artifactId>feign-slf4j</artifactId>
            <version>8.14.4</version>
        </dependency>
        <!--        lombok插件-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>RELEASE</version>
            <scope>compile</scope>
        </dependency>
<!--        @SentinelResource 注解用来标识资源是否被限流、降级。
        blockHandler: 定义当资源内部发生了BlockException应该进入的方法（捕获的是Sentinel定义的异常）
        fallback: 定义的是资源内部发生了Throwable应该进入的方法
        exceptionsToIgnore：配置fallback可以忽略的异常
        源码入口：com.alibaba.csp.sentinel.annotation.aspectj.SentinelResourceAspect-->
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-annotation-aspectj</artifactId>
            <version>1.8.0</version>
        </dependency>
<!--        流控规则设置可以通过Sentinel dashboard配置
        客户端需要引入 Transport 模块来与 Sentinel 控制台进行通信。-->
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-transport-simple-http</artifactId>
            <version>1.8.0</version>
        </dependency>
        <!--- 解决流控链路不生效的问题
        从1.6.3版本开始，Sentinel Web filter默认收敛所有URL的入口context，导致链路限流不生效。
        从1.7.0版本开始，官方在CommonFilter引入了WEB_CONTEXT_UNIFY参数，用于控制是否收敛context，将其配置为false即可根据不同的URL进行链路限流。
        1.8.0 需要引入sentinel-web-servlet依赖
        -->
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-web-servlet</artifactId>
        </dependency>
        <!-- Spring Cloud Alibaba整合Sentinel -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--sentinel持久化 采用 Nacos 作为规则配置数据源-->
<!--        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
        </dependency>-->
    </dependencies>
    <!--
        引入 Spring Boot、Spring Cloud、Spring Cloud Alibaba 三者 BOM 文件，进行依赖版本的管理，防止不兼容。
        在 https://dwz.cn/mcLIfNKt 文章中，Spring Cloud Alibaba 开发团队推荐了三者的依赖关系
     -->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-parent</artifactId>
                <version>${spring.boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring.cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring.cloud.alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

package com.example.springcloudalibabasentineldemo;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@MapperScan("com.example.springcloudalibabasentineldemo.dao")
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class SpringCloudAlibabaSentinelDemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringCloudAlibabaSentinelDemoApplication.class, args);
    }
}

#bootstrap.yml优先级比application.yml优先级高
spring:
  #prefix−{spring.profile.active}.${file-extension}
  #nacos会根据当前环境去拼接配置名称查找相应配置文件，
  #示例：{spring.application.name}-{spring.profiles.active}-{spring.cloud.nacos.config.file-extension}
  #获取到值：nacos-autoconfig-service-dev.yml
  profiles:
    #开发环境dev，测试环境test，生产环境prod
    active: dev
  application:
    #配置应用的名称，用于获取配置
    name: spring-cloud-alibaba-sentinel-demo
  cloud:
    nacos:
      discovery:
        # 服务注册地址
        server-addr: 106.14.132.94:8848
      config:
        #nacos配置中心地址
        server-addr: 106.14.132.94:8848
        #配置中心的命名空间id
        namespace: 9e50b6d9-6c3d-4e7a-b701-10f085e4b98d
        #配置分组，默认没有也可以
        group: DEFAULT_GROUP
        #配置文件后缀，用于拼接配置配置文件名称，目前只支持yaml和properties
        file-extension: yaml
        #配置自动刷新
        refresh-enabled: true
        #配置文件的前缀，默认是application.name的值，如果配了prefix，就取prefix的值
        #prefix: nacos-autoconfig-service-${spring.profile.active}
        # 配置编码
        encode: UTF-8
        username: nacos
        password: nacos

server:
  port: 8095
#暴露actuator端点   http://localhost:8800/actuator/sentinel
management:
  endpoints:
    web:
      exposure:
        include: '*'
spring:
  application:
    name: mall-user-sentinel-demo
  cloud:
    sentinel:
      transport:
        # 添加sentinel的控制台地址
        dashboard: 127.0.0.1:8080
        # 指定应用与Sentinel控制台交互的端口，应用本地会起一个该端口占用的HttpServer
        #port: 8719
  #      datasource:
  #        ds1:
  #          nacos:
  #            server-addr: 127.0.0.1:8848
  #            dataId: ${spring.application.name}
  #            groupId: DEFAULT_GROUP
  #            data-type: json
  #            rule-type: flow
  #数据库配置
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://139.224.137.74:3306/syncdemo?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
    username: root
    password: ca0a997ee4770063
#mybatis
mybatis-plus:
  mapper-locations: classpath*:/mapper/*.xml
  #实体扫描，多个package用逗号或者分号分隔
  typeAliasesPackage: com.example.springcloudalibabasentineldemo.entity

package com.example.springcloudalibabasentineldemo.config;
import com.alibaba.csp.sentinel.adapter.servlet.CommonFilter;
import com.alibaba.csp.sentinel.adapter.servlet.callback.WebCallbackManager;
import com.example.springcloudalibabasentineldemo.sentinel.MyUrlBlockHandler;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
 * @className: SentinelConfig
 * @description: https://github.com/alibaba/Sentinel/issues/1213
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
@Configuration
public class SentinelConfig {
    @Bean
    public FilterRegistrationBean sentinelFilterRegistration() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new CommonFilter());
        registration.addUrlPatterns("/*");
        // 入口资源关闭聚合  解决流控链路不生效的问题
        registration.addInitParameter(CommonFilter.WEB_CONTEXT_UNIFY, "false");
        registration.setName("sentinelFilter");
        registration.setOrder(1);
        //CommonFilter的BlockException自定义处理逻辑
        WebCallbackManager.setUrlBlockHandler(new MyUrlBlockHandler());
        //解决授权规则不生效的问题
        //com.alibaba.csp.sentinel.adapter.servlet.callback.RequestOriginParser
        //WebCallbackManager.setRequestOriginParser(new MyRequestOriginParser());
        return registration;
    }
}

package com.example.springcloudalibabasentineldemo.controller;
import com.alibaba.csp.sentinel.Entry;
import com.alibaba.csp.sentinel.SphU;
import com.alibaba.csp.sentinel.Tracer;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.RuleConstant;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.PostConstruct;
import java.util.ArrayList;
import java.util.List;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
@RestController
@Slf4j
public class HelloController {
    private static final String RESOURCE_NAME = "hello";
    @RequestMapping(value = "/hello")
    public String hello() {
        Entry entry = null;
        try {
            // 资源名可使用任意有业务语义的字符串，比如方法名、接口名或其它可唯一标识的字符串。
            entry = SphU.entry(RESOURCE_NAME);
            // 被保护的业务逻辑
            String str = "hello world";
            log.info("====="+str+"=====");
            return str;
        } catch (BlockException e1) {
            // 资源访问阻止，被限流或被降级
            //进行相应的处理操作
            log.info("block!");
            return "被流控了！";
        } catch (Exception ex) {
            // 若需要配置降级规则，需要通过这种方式记录业务异常
            Tracer.traceEntry(ex, entry);
        } finally {
            if (entry != null) {
                entry.exit();
            }
        }
        return null;
    }
    /**
     * 定义流控规则
     */
    @PostConstruct
    private static void initFlowRules(){
        List<FlowRule> rules = new ArrayList<>();
        FlowRule rule = new FlowRule();
        //设置受保护的资源
        rule.setResource(RESOURCE_NAME);
        // 设置流控规则 QPS
        rule.setGrade(RuleConstant.FLOW_GRADE_QPS);
        // 设置受保护的资源阈值
        // Set limit QPS to 20.
        rule.setCount(1);
        rules.add(rule);
        // 加载配置好的规则
        FlowRuleManager.loadRules(rules);
    }
}

package com.example.springcloudalibabasentineldemo.controller;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.example.springcloudalibabasentineldemo.entity.UserEntity;
import com.example.springcloudalibabasentineldemo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.concurrent.atomic.AtomicInteger;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
@RestController
public class LimitFlowController {
    @RequestMapping("/test")
//    @SentinelResource(value = "test",blockHandlerClass = CommonBlockHandler.class,blockHandler = "handleException3")
    public String test() {
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "========test()========";
    }
    AtomicInteger atomicInteger = new AtomicInteger();
    @RequestMapping("/test2")
    public String test2() {
        atomicInteger.getAndIncrement();
        if (atomicInteger.get() % 2 == 0){
            //模拟异常和异常比率
            int i = 1/0;
        }
        return "========test2()========";
    }
    @Autowired
    private UserService userService;
    @RequestMapping(value = "/test3")  //CommonFilter
    public UserEntity test3() {
        UserEntity user = userService.getUser(1);
        return user;
    }
    @RequestMapping(value = "/test4")
    public UserEntity test4() {
        UserEntity user = userService.getUser(1);
        return user;
    }
    public String handleException(BlockException exception) {
        return "===被限流降级啦===";
    }
}

package com.example.springcloudalibabasentineldemo.controller;
import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.example.springcloudalibabasentineldemo.entity.UserEntity;
import com.example.springcloudalibabasentineldemo.feign.OrderFeignService;
import com.example.springcloudalibabasentineldemo.sentinel.CommonBlockHandler;
import com.example.springcloudalibabasentineldemo.sentinel.CommonFallback;
import com.example.springcloudalibabasentineldemo.service.UserService;
import com.example.springcloudalibabasentineldemo.utils.PageUtils;
import com.example.springcloudalibabasentineldemo.utils.R;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.Arrays;
import java.util.Map;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
@RestController
@RequestMapping(value = "/user")
public class UserController {
    @Autowired
    private UserService userService;
    @Autowired
    OrderFeignService orderFeignService;
    @RequestMapping(value = "/getNacosConfigure")
    @SentinelResource(value = "getNacosConfigure",
            blockHandlerClass = CommonBlockHandler.class,
            blockHandler = "getNacosConfigure",
            fallbackClass = CommonFallback.class,
            fallback = "getNacosConfigure"
    )
    public String getNacosConfigure() {
//        try {
//            // 模拟测试并发线程数限流
//            Thread.sleep(900);
//        } catch (InterruptedException e) {
//            e.printStackTrace();
//        }
        // findOrderByUserId  限流规则  2    sentinel dashboard 定义规则
        //feign调用
        String result = orderFeignService.getNacosConfigure();
        return result;
    }
    /**
     * 列表
     */
    @RequestMapping("/list")
    @SentinelResource(value = "userlist",
            blockHandlerClass = CommonBlockHandler.class,
            blockHandler = "handleException",fallback = "fallback")
    public R list(@RequestParam Map<String, Object> params){
        PageUtils page = userService.queryPage(params);
       // int i=1/0;
        return R.ok().put("page", page);
    }
    public R handleException(@RequestParam Map<String, Object> params,BlockException exception){
        return R.error(-1,"===被限流降级啦===");
    }
    /**
     * 信息
     */
    @RequestMapping("/info/{id}")
    @SentinelResource(value = "userinfo",
            blockHandlerClass = CommonBlockHandler.class,
            blockHandler = "handleException2",
            fallbackClass = CommonFallback.class,
            fallback = "fallback"
    )
    public R info(@PathVariable("id") Integer id){
    UserEntity user = userService.getById(id);
    if(id==4){
        throw new IllegalArgumentException("异常参数");
        }
        return R.ok().put("mapper", user);
    }
    public R handleException2(@PathVariable("id") Integer id, BlockException exception){
        return R.error(-1,"===被限流降级啦===");
    }
    public R fallback(@PathVariable("id") Integer id,Throwable e){
        return R.error(-1,"===被熔断降级啦==="+e.getMessage());
    }
    /**
     * 保存
     */
    @RequestMapping("/save")
    public R save(@RequestBody UserEntity user){
    userService.save(user);
        return R.ok();
    }
    /**
     * 修改
     */
    @RequestMapping("/update")
    public R update(@RequestBody UserEntity user){
    userService.updateById(user);
        return R.ok();
    }
    /**
     * 删除
     */
    @RequestMapping("/delete")
    public R delete(@RequestBody Integer[] ids){
    userService.removeByIds(Arrays.asList(ids));
        return R.ok();
    }
}

package com.example.springcloudalibabasentineldemo.dao;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.springcloudalibabasentineldemo.entity.UserEntity;
import org.apache.ibatis.annotations.Mapper;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
@Mapper
public interface UserDao extends BaseMapper<UserEntity> {
}

package com.example.springcloudalibabasentineldemo.demo;
import com.alibaba.csp.sentinel.Entry;
import com.alibaba.csp.sentinel.SphU;
import com.alibaba.csp.sentinel.context.ContextUtil;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.RuleConstant;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityRule;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityRuleManager;
import java.util.Collections;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
public class AuthorityDemo {
    private static final String RESOURCE_NAME = "testABC";
    public static void main(String[] args) {
        System.out.println("========Testing for black list========");
        initBlackRules();
        testFor(RESOURCE_NAME, "appA");
        testFor(RESOURCE_NAME, "appB");
        testFor(RESOURCE_NAME, "appC");
        testFor(RESOURCE_NAME, "appE");
        System.out.println("========Testing for white list========");
        initWhiteRules();
        testFor(RESOURCE_NAME, "appA");
        testFor(RESOURCE_NAME, "appB");
        testFor(RESOURCE_NAME, "appC");
        testFor(RESOURCE_NAME, "appE");
    }
    private static void testFor(/*@NonNull*/ String resource, /*@NonNull*/ String origin) {
        ContextUtil.enter(resource, origin);
        Entry entry = null;
        try {
            entry = SphU.entry(resource);
            System.out.println(String.format("Passed for resource %s, origin is %s", resource, origin));
        } catch (BlockException ex) {
            System.err.println(String.format("Blocked for resource %s, origin is %s", resource, origin));
        } finally {
            if (entry != null) {
                entry.exit();
            }
            ContextUtil.exit();
        }
    }
    private static void initWhiteRules() {
        AuthorityRule rule = new AuthorityRule();
        rule.setResource(RESOURCE_NAME);
        rule.setStrategy(RuleConstant.AUTHORITY_WHITE);
        rule.setLimitApp("appA,appE");
        AuthorityRuleManager.loadRules(Collections.singletonList(rule));
    }
    private static void initBlackRules() {
        AuthorityRule rule = new AuthorityRule();
        rule.setResource(RESOURCE_NAME);
        rule.setStrategy(RuleConstant.AUTHORITY_BLACK);
        rule.setLimitApp("appA,appB");
        AuthorityRuleManager.loadRules(Collections.singletonList(rule));
    }
}

package com.example.springcloudalibabasentineldemo.demo;
import com.alibaba.csp.sentinel.Entry;
import com.alibaba.csp.sentinel.SphU;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.RuleConstant;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager;
import com.alibaba.csp.sentinel.util.TimeUtil;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
public class FlowThreadDemo {
    private static AtomicInteger pass = new AtomicInteger();
    private static AtomicInteger block = new AtomicInteger();
    private static AtomicInteger total = new AtomicInteger();
    private static AtomicInteger activeThread = new AtomicInteger();
    private static volatile boolean stop = false;
    private static final int threadCount = 100;
    private static int seconds = 60 + 40;
    private static volatile int methodBRunningTime = 2000;
    public static void main(String[] args) throws Exception {
        System.out.println(
                "MethodA will call methodB. After running for a while, methodB becomes fast, "
                        + "which make methodA also become fast ");
        tick();
        initFlowRule();
        for (int i = 0; i < threadCount; i++) {
            Thread entryThread = new Thread(new Runnable() {
                @Override
                public void run() {
                    while (true) {
                        Entry methodA = null;
                        try {
                            TimeUnit.MILLISECONDS.sleep(5);
                            methodA = SphU.entry("methodA");
                            activeThread.incrementAndGet();
                            Entry methodB = SphU.entry("methodB");
                            TimeUnit.MILLISECONDS.sleep(methodBRunningTime);
                            methodB.exit();
                            pass.addAndGet(1);
                        } catch (BlockException e1) {
                            block.incrementAndGet();
                        } catch (Exception e2) {
                            // biz exception
                        } finally {
                            total.incrementAndGet();
                            if (methodA != null) {
                                methodA.exit();
                                activeThread.decrementAndGet();
                            }
                        }
                    }
                }
            });
            entryThread.setName("working thread");
            entryThread.start();
        }
    }
    private static void initFlowRule() {
        List<FlowRule> rules = new ArrayList<FlowRule>();
        FlowRule rule1 = new FlowRule();
        rule1.setResource("methodA");
        // set limit concurrent thread for 'methodA' to 20
        rule1.setCount(20);
        rule1.setGrade(RuleConstant.FLOW_GRADE_THREAD);
        rule1.setLimitApp("default");
        rules.add(rule1);
        FlowRuleManager.loadRules(rules);
    }
    private static void tick() {
        Thread timer = new Thread(new TimerTask());
        timer.setName("sentinel-timer-task");
        timer.start();
    }
    static class TimerTask implements Runnable {
        @Override
        public void run() {
            long start = System.currentTimeMillis();
            System.out.println("begin to statistic!!!");
            long oldTotal = 0;
            long oldPass = 0;
            long oldBlock = 0;
            while (!stop) {
                try {
                    TimeUnit.SECONDS.sleep(1);
                } catch (InterruptedException e) {
                }
                long globalTotal = total.get();
                long oneSecondTotal = globalTotal - oldTotal;
                oldTotal = globalTotal;
                long globalPass = pass.get();
                long oneSecondPass = globalPass - oldPass;
                oldPass = globalPass;
                long globalBlock = block.get();
                long oneSecondBlock = globalBlock - oldBlock;
                oldBlock = globalBlock;
                System.out.println(seconds + " total qps is: " + oneSecondTotal);
                System.out.println(TimeUtil.currentTimeMillis() + ", total:" + oneSecondTotal
                        + ", pass:" + oneSecondPass
                        + ", block:" + oneSecondBlock
                        + " activeThread:" + activeThread.get());
                if (seconds-- <= 0) {
                    stop = true;
                }
                if (seconds == 40) {
                    System.out.println("method B is running much faster; more requests are allowed to pass");
                    methodBRunningTime = 20;
                }
            }
            long cost = System.currentTimeMillis() - start;
            System.out.println("time cost: " + cost + " ms");
            System.out.println("total:" + total.get() + ", pass:" + pass.get()
                    + ", block:" + block.get());
            System.exit(0);
        }
    }
}

package com.example.springcloudalibabasentineldemo.demo;
import com.alibaba.csp.sentinel.Entry;
import com.alibaba.csp.sentinel.SphU;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.RuleConstant;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager;
import com.alibaba.csp.sentinel.util.TimeUtil;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
public class PaceFlowDemo {
    private static final String KEY = "abc";
    private static volatile CountDownLatch countDown;
    private static final Integer requestQps = 100;
    private static final Integer count = 10;
    private static final AtomicInteger done = new AtomicInteger();
    private static final AtomicInteger pass = new AtomicInteger();
    private static final AtomicInteger block = new AtomicInteger();
    public static void main(String[] args) throws InterruptedException {
        System.out.println("pace behavior");
        countDown = new CountDownLatch(1);
        initPaceFlowRule();
        simulatePulseFlow();
        countDown.await();
        System.out.println("done");
        System.out.println("total pass:" + pass.get() + ", total block:" + block.get());
        System.out.println();
        System.out.println("default behavior");
        TimeUnit.SECONDS.sleep(5);
        done.set(0);
        pass.set(0);
        block.set(0);
        countDown = new CountDownLatch(1);
        initDefaultFlowRule();
        simulatePulseFlow();
        countDown.await();
        System.out.println("done");
        System.out.println("total pass:" + pass.get() + ", total block:" + block.get());
        System.exit(0);
    }
    private static void initPaceFlowRule() {
        List<FlowRule> rules = new ArrayList<FlowRule>();
        FlowRule rule1 = new FlowRule();
        rule1.setResource(KEY);
        rule1.setCount(count);
        rule1.setGrade(RuleConstant.FLOW_GRADE_QPS);
        rule1.setLimitApp("default");
        /*
         * CONTROL_BEHAVIOR_RATE_LIMITER means requests more than threshold will be queueing in the queue,
         * until the queueing time is more than {@link FlowRule#maxQueueingTimeMs}, the requests will be rejected.
         */
        rule1.setControlBehavior(RuleConstant.CONTROL_BEHAVIOR_RATE_LIMITER);
        rule1.setMaxQueueingTimeMs(20 * 1000);
        rules.add(rule1);
        FlowRuleManager.loadRules(rules);
    }
    private static void initDefaultFlowRule() {
        List<FlowRule> rules = new ArrayList<FlowRule>();
        FlowRule rule1 = new FlowRule();
        rule1.setResource(KEY);
        rule1.setCount(count);
        rule1.setGrade(RuleConstant.FLOW_GRADE_QPS);
        rule1.setLimitApp("default");
        // CONTROL_BEHAVIOR_DEFAULT means requests more than threshold will be rejected immediately.
        rule1.setControlBehavior(RuleConstant.CONTROL_BEHAVIOR_DEFAULT);
        rules.add(rule1);
        FlowRuleManager.loadRules(rules);
    }
    private static void simulatePulseFlow() {
        for (int i = 0; i < requestQps; i++) {
            Thread thread = new Thread(new Runnable() {
                @Override
                public void run() {
                    long startTime = TimeUtil.currentTimeMillis();
                    Entry entry = null;
                    try {
                        entry = SphU.entry(KEY);
                    } catch (BlockException e1) {
                        block.incrementAndGet();
                    } catch (Exception e2) {
                        // biz exception
                    } finally {
                        if (entry != null) {
                            entry.exit();
                            pass.incrementAndGet();
                            long cost = TimeUtil.currentTimeMillis() - startTime;
                            System.out.println(
                                    TimeUtil.currentTimeMillis() + " one request pass, cost " + cost + " ms");
                        }
                    }
                    try {
                        TimeUnit.MILLISECONDS.sleep(5);
                    } catch (InterruptedException e1) {
                        // ignore
                    }
                    if (done.incrementAndGet() >= requestQps) {
                        countDown.countDown();
                    }
                }
            }, "Thread " + i);
            thread.start();
        }
    }
}

package com.example.springcloudalibabasentineldemo.demo;
import com.alibaba.csp.sentinel.Entry;
import com.alibaba.csp.sentinel.EntryType;
import com.alibaba.csp.sentinel.SphU;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.system.SystemRule;
import com.alibaba.csp.sentinel.slots.system.SystemRuleManager;
import com.alibaba.csp.sentinel.util.TimeUtil;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
public class SystemGuardDemo {
    private static AtomicInteger pass = new AtomicInteger();
    private static AtomicInteger block = new AtomicInteger();
    private static AtomicInteger total = new AtomicInteger();
    private static volatile boolean stop = false;
    private static final int threadCount = 100;
    private static int seconds = 60 + 40;
    public static void main(String[] args) throws Exception {
        tick();
        initSystemRule();
        for (int i = 0; i < threadCount; i++) {
            Thread entryThread = new Thread(new Runnable() {
                @Override
                public void run() {
                    while (true) {
                        Entry entry = null;
                        try {
                            entry = SphU.entry("methodA", EntryType.IN);
                            pass.incrementAndGet();
                            try {
                                TimeUnit.MILLISECONDS.sleep(20);
                            } catch (InterruptedException e) {
                                // ignore
                            }
                        } catch (BlockException e1) {
                            block.incrementAndGet();
                            try {
                                TimeUnit.MILLISECONDS.sleep(20);
                            } catch (InterruptedException e) {
                                // ignore
                            }
                        } catch (Exception e2) {
                            // biz exception
                        } finally {
                            total.incrementAndGet();
                            if (entry != null) {
                                entry.exit();
                            }
                        }
                    }
                }
            });
            entryThread.setName("working-thread");
            entryThread.start();
        }
    }
    private static void initSystemRule() {
        List<SystemRule> rules = new ArrayList<SystemRule>();
        SystemRule rule = new SystemRule();
        // max load is 3
        rule.setHighestSystemLoad(3.0);
        // max cpu usage is 60%
        rule.setHighestCpuUsage(0.6);
        // max avg rt of all request is 10 ms
        rule.setAvgRt(10);
        // max total qps is 20
        rule.setQps(20);
        // max parallel working thread is 10
        rule.setMaxThread(10);
        rules.add(rule);
        SystemRuleManager.loadRules(Collections.singletonList(rule));
    }
    private static void tick() {
        Thread timer = new Thread(new TimerTask());
        timer.setName("sentinel-timer-task");
        timer.start();
    }
    static class TimerTask implements Runnable {
        @Override
        public void run() {
            System.out.println("begin to statistic!!!");
            long oldTotal = 0;
            long oldPass = 0;
            long oldBlock = 0;
            while (!stop) {
                try {
                    TimeUnit.SECONDS.sleep(1);
                } catch (InterruptedException e) {
                }
                long globalTotal = total.get();
                long oneSecondTotal = globalTotal - oldTotal;
                oldTotal = globalTotal;
                long globalPass = pass.get();
                long oneSecondPass = globalPass - oldPass;
                oldPass = globalPass;
                long globalBlock = block.get();
                long oneSecondBlock = globalBlock - oldBlock;
                oldBlock = globalBlock;
                System.out.println(seconds + ", " + TimeUtil.currentTimeMillis() + ", total:"
                    + oneSecondTotal + ", pass:"
                    + oneSecondPass + ", block:" + oneSecondBlock);
                if (seconds-- <= 0) {
                    stop = true;
                }
            }
            System.exit(0);
        }
    }
}

package com.example.springcloudalibabasentineldemo.demo;
import com.alibaba.csp.sentinel.Entry;
import com.alibaba.csp.sentinel.SphU;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.RuleConstant;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager;
import com.alibaba.csp.sentinel.util.TimeUtil;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
public class WarmUpFlowDemo {
    private static final String KEY = "abc";
    private static AtomicInteger pass = new AtomicInteger();
    private static AtomicInteger block = new AtomicInteger();
    private static AtomicInteger total = new AtomicInteger();
    private static volatile boolean stop = false;
    private static final int threadCount = 100;
    private static int seconds = 60 + 40;
    public static void main(String[] args) throws Exception {
        initFlowRule();
        // trigger Sentinel internal init
        Entry entry = null;
        try {
            entry = SphU.entry(KEY);
        } catch (Exception e) {
        } finally {
            if (entry != null) {
                entry.exit();
            }
        }
        Thread timer = new Thread(new TimerTask());
        timer.setName("sentinel-timer-task");
        timer.start();
        //first make the system run on a very low condition
        for (int i = 0; i < 3; i++) {
            Thread t = new Thread(new WarmUpTask());
            t.setName("sentinel-warmup-task");
            t.start();
        }
        Thread.sleep(20000);
        /*
         * Start more thread to simulate more qps. Since we use {@link RuleConstant.CONTROL_BEHAVIOR_WARM_UP} as
         * {@link FlowRule#controlBehavior}, real passed qps will increase to {@link FlowRule#count} in
         * {@link FlowRule#warmUpPeriodSec} seconds.
         */
        for (int i = 0; i < threadCount; i++) {
            Thread t = new Thread(new RunTask());
            t.setName("sentinel-run-task");
            t.start();
        }
    }
    private static void initFlowRule() {
        List<FlowRule> rules = new ArrayList<FlowRule>();
        FlowRule rule1 = new FlowRule();
        rule1.setResource(KEY);
        rule1.setCount(20);
        rule1.setGrade(RuleConstant.FLOW_GRADE_QPS);
        rule1.setLimitApp("default");
        rule1.setControlBehavior(RuleConstant.CONTROL_BEHAVIOR_WARM_UP);
        rule1.setWarmUpPeriodSec(10);
        rules.add(rule1);
        FlowRuleManager.loadRules(rules);
    }
    static class WarmUpTask implements Runnable {
        @Override
        public void run() {
            while (!stop) {
                Entry entry = null;
                try {
                    entry = SphU.entry(KEY);
                    // token acquired, means pass
                    pass.addAndGet(1);
                } catch (BlockException e1) {
                    block.incrementAndGet();
                } catch (Exception e2) {
                    // biz exception
                } finally {
                    total.incrementAndGet();
                    if (entry != null) {
                        entry.exit();
                    }
                }
                Random random2 = new Random();
                try {
                    TimeUnit.MILLISECONDS.sleep(random2.nextInt(2000));
                } catch (InterruptedException e) {
                    // ignore
                }
            }
        }
    }
    static class RunTask implements Runnable {
        @Override
        public void run() {
            while (!stop) {
                Entry entry = null;
                try {
                    entry = SphU.entry(KEY);
                    pass.addAndGet(1);
                } catch (BlockException e1) {
                    block.incrementAndGet();
                } catch (Exception e2) {
                    // biz exception
                } finally {
                    total.incrementAndGet();
                    if (entry != null) {
                        entry.exit();
                    }
                }
                Random random2 = new Random();
                try {
                    TimeUnit.MILLISECONDS.sleep(random2.nextInt(50));
                } catch (InterruptedException e) {
                    // ignore
                }
            }
        }
    }
    static class TimerTask implements Runnable {
        @Override
        public void run() {
            long start = System.currentTimeMillis();
            System.out.println("begin to statistic!!!");
            long oldTotal = 0;
            long oldPass = 0;
            long oldBlock = 0;
            while (!stop) {
                try {
                    TimeUnit.SECONDS.sleep(1);
                } catch (InterruptedException e) {
                }
                long globalTotal = total.get();
                long oneSecondTotal = globalTotal - oldTotal;
                oldTotal = globalTotal;
                long globalPass = pass.get();
                long oneSecondPass = globalPass - oldPass;
                oldPass = globalPass;
                long globalBlock = block.get();
                long oneSecondBlock = globalBlock - oldBlock;
                oldBlock = globalBlock;
                System.out.println(TimeUtil.currentTimeMillis() + ", total:" + oneSecondTotal
                        + ", pass:" + oneSecondPass
                        + ", block:" + oneSecondBlock);
                if (seconds-- <= 0) {
                    stop = true;
                }
            }
            long cost = System.currentTimeMillis() - start;
            System.out.println("time cost: " + cost + " ms");
            System.out.println("total:" + total.get() + ", pass:" + pass.get()
                    + ", block:" + block.get());
            System.exit(0);
        }
    }
}

package com.example.springcloudalibabasentineldemo.entity;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
import java.io.Serializable;
/**
 * @className: RedisController
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
@Data
@TableName("t_user")
public class UserEntity implements Serializable {
  private static final long serialVersionUID = 1L;
  /**
   * 
   */
  @TableId
  private Integer id;
  /**
   * 
   */
  private String username;
  /**
   * 
   */
  private Integer age;
}

/**
 * Copyright (c) 2016-2019 人人开源 All rights reserved.
 *
 * https://www.renren.io
 *
 * 版权所有，侵权必究！
 */
package com.example.springcloudalibabasentineldemo.exception;
/**
 * @description:自定义异常
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
public class RRException extends RuntimeException {
  private static final long serialVersionUID = 1L;
    private String msg;
    private int code = 500;
    public RRException(String msg) {
    super(msg);
    this.msg = msg;
  }
  public RRException(String msg, Throwable e) {
    super(msg, e);
    this.msg = msg;
  }
  public RRException(String msg, int code) {
    super(msg);
    this.msg = msg;
    this.code = code;
  }
  public RRException(String msg, int code, Throwable e) {
    super(msg, e);
    this.msg = msg;
    this.code = code;
  }
  public String getMsg() {
    return msg;
  }
  public void setMsg(String msg) {
    this.msg = msg;
  }
  public int getCode() {
    return code;
  }
  public void setCode(int code) {
    this.code = code;
  }
}

package com.example.springcloudalibabasentineldemo.feign;
import com.example.springcloudalibabasentineldemo.utils.R;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
@FeignClient(value = "open-feign",path = "/feign")
public interface OrderFeignService {
    @RequestMapping("/getNacosConfigure")
    public String getNacosConfigure();
}

package com.example.springcloudalibabasentineldemo.sentinel;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.example.springcloudalibabasentineldemo.utils.R;
import java.util.Map;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
public class CommonBlockHandler {
    /**
     * 注意： 必须为 static 函数   多个方法之间方法名不能一样
     * @param exception
     * @return
     */
    public static R handleException(Map<String, Object> params, BlockException exception){
        return R.error(-1,"===被限流啦==="+exception);
    }
    public String getNacosConfigure() {
        return "===被限流啦===";
    }
    public static R handleException2(Integer id, BlockException exception){
        return R.error(-1,"===被限流啦==="+exception);
    }
    public static String handleException3(BlockException exception){
        return "===被限流啦==="+exception;
    }
}

package com.example.springcloudalibabasentineldemo.sentinel;
import com.example.springcloudalibabasentineldemo.utils.R;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
public class CommonFallback {
    /**
     * 注意： 必须为 static 函数
     * @param e
     * @return
     */
    public static R fallback(Integer id, Throwable e){
        return R.error(-2,"===被异常降级啦==="+e.getMessage());
    }
    public String getNacosConfigure() {
        return "===被异常降级啦===";
    }
}

package com.example.springcloudalibabasentineldemo.sentinel;
import com.alibaba.csp.sentinel.adapter.spring.webmvc.callback.BlockExceptionHandler;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityException;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeException;
import com.alibaba.csp.sentinel.slots.block.flow.FlowException;
import com.alibaba.csp.sentinel.slots.block.flow.param.ParamFlowException;
import com.alibaba.csp.sentinel.slots.system.SystemBlockException;
import com.example.springcloudalibabasentineldemo.utils.R;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
@Slf4j
@Component
public class MyBlockExceptionHandler implements BlockExceptionHandler {
    @Override
    public void handle(HttpServletRequest request, HttpServletResponse response, BlockException e) throws Exception {
        log.info("BlockExceptionHandler BlockException================"+e.getRule());
        R r = null;
        if (e instanceof FlowException) {
            r = R.error(100,"接口限流了");
        } else if (e instanceof DegradeException) {
            r = R.error(101,"服务降级了");
        } else if (e instanceof ParamFlowException) {
            r = R.error(102,"热点参数限流了");
        } else if (e instanceof SystemBlockException) {
            r = R.error(103,"触发系统保护规则了");
        } else if (e instanceof AuthorityException) {
            r = R.error(104,"授权规则不通过");
        }
        //返回json数据
        response.setStatus(500);
        response.setCharacterEncoding("utf-8");
        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
        new ObjectMapper().writeValue(response.getWriter(), r);
    }
}

package com.example.springcloudalibabasentineldemo.sentinel;
import com.alibaba.csp.sentinel.adapter.spring.webmvc.callback.RequestOriginParser;
import javax.servlet.http.HttpServletRequest;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
//@Component
public class MyRequestOriginParser implements RequestOriginParser {
    /**
     * 通过request获取来源标识，交给授权规则进行匹配
     * @param request
     * @return
     */
    @Override
    public String parseOrigin(HttpServletRequest request) {
        // 标识字段名称可以自定义
        String origin = request.getParameter("serviceName");
//        if (StringUtil.isBlank(origin)){
//            throw new IllegalArgumentException("serviceName参数未指定");
//        }
        return origin;
    }
}

package com.example.springcloudalibabasentineldemo.sentinel;
import com.alibaba.csp.sentinel.adapter.servlet.callback.UrlBlockHandler;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityException;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeException;
import com.alibaba.csp.sentinel.slots.block.flow.FlowException;
import com.alibaba.csp.sentinel.slots.block.flow.param.ParamFlowException;
import com.alibaba.csp.sentinel.slots.system.SystemBlockException;
import com.example.springcloudalibabasentineldemo.utils.R;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.MediaType;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
@Slf4j
public class MyUrlBlockHandler implements UrlBlockHandler {
    @Override
    public void blocked(HttpServletRequest request, HttpServletResponse response, BlockException e) throws IOException {
        log.info("UrlBlockHandler BlockException================"+e.getRule());
        R r = null;
        if (e instanceof FlowException) {
            r = R.error(100,"接口限流了");
        } else if (e instanceof DegradeException) {
            r = R.error(101,"服务降级了");
        } else if (e instanceof ParamFlowException) {
            r = R.error(102,"热点参数限流了");
        } else if (e instanceof SystemBlockException) {
            r = R.error(103,"触发系统保护规则了");
        } else if (e instanceof AuthorityException) {
            r = R.error(104,"授权规则不通过");
        }
        //返回json数据
        response.setStatus(500);
        response.setCharacterEncoding("utf-8");
        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
        new ObjectMapper().writeValue(response.getWriter(), r);
    }
}

package com.example.springcloudalibabasentineldemo.service.impl;
import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.springcloudalibabasentineldemo.dao.UserDao;
import com.example.springcloudalibabasentineldemo.entity.UserEntity;
import com.example.springcloudalibabasentineldemo.service.UserService;
import com.example.springcloudalibabasentineldemo.utils.PageUtils;
import com.example.springcloudalibabasentineldemo.utils.Query;
import org.springframework.stereotype.Service;
import java.util.Map;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
@Service("userService")
public class UserServiceImpl extends ServiceImpl<UserDao, UserEntity> implements UserService {
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<UserEntity> page = this.page(
                new Query<UserEntity>().getPage(params),
                new QueryWrapper<UserEntity>()
        );
        return new PageUtils(page);
    }
    @Override
    @SentinelResource(value = "getUser")  //aop
    public UserEntity getUser(int id){
        UserEntity user = baseMapper.selectById(id);
        return user;
    }
    public UserEntity handleException(int id, BlockException ex) {
        UserEntity userEntity = new UserEntity();
        userEntity.setUsername("===被限流降级啦===");
        return userEntity;
    }
}

package com.example.springcloudalibabasentineldemo.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.example.springcloudalibabasentineldemo.entity.UserEntity;
import com.example.springcloudalibabasentineldemo.utils.PageUtils;
import java.util.Map;
/**
 * @description:
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
public interface UserService extends IService<UserEntity> {
    PageUtils queryPage(Map<String, Object> params);
    UserEntity getUser(int id);
}

/**
 * Copyright (c) 2016-2019 人人开源 All rights reserved.
 *
 * https://www.renren.io
 *
 * 版权所有，侵权必究！
 */
package com.example.springcloudalibabasentineldemo.utils;
/**
 * @description:常量
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
public class Constant {
  /** 超级管理员ID */
  public static final int SUPER_ADMIN = 1;
    /**
     * 当前页码
     */
    public static final String PAGE = "page";
    /**
     * 每页显示记录数
     */
    public static final String LIMIT = "limit";
    /**
     * 排序字段
     */
    public static final String ORDER_FIELD = "sidx";
    /**
     * 排序方式
     */
    public static final String ORDER = "order";
    /**
     *  升序
     */
    public static final String ASC = "asc";
  /**
   * 菜单类型
   * 
   * @author chenshun
   * @email sunlightcs@gmail.com
   * @date 2016年11月15日 下午1:24:29
   */
    public enum MenuType {
        /**
         * 目录
         */
      CATALOG(0),
        /**
         * 菜单
         */
        MENU(1),
        /**
         * 按钮
         */
        BUTTON(2);
        private int value;
        MenuType(int value) {
            this.value = value;
        }
        public int getValue() {
            return value;
        }
    }
    /**
     * 定时任务状态
     * 
     * @author chenshun
     * @email sunlightcs@gmail.com
     * @date 2016年12月3日 上午12:07:22
     */
    public enum ScheduleStatus {
        /**
         * 正常
         */
      NORMAL(0),
        /**
         * 暂停
         */
      PAUSE(1);
        private int value;
        ScheduleStatus(int value) {
            this.value = value;
        }
        public int getValue() {
            return value;
        }
    }
    /**
     * 云服务商
     */
    public enum CloudService {
        /**
         * 七牛云
         */
        QINIU(1),
        /**
         * 阿里云
         */
        ALIYUN(2),
        /**
         * 腾讯云
         */
        QCLOUD(3);
        private int value;
        CloudService(int value) {
            this.value = value;
        }
        public int getValue() {
            return value;
        }
    }
}

/**
 * Copyright (c) 2016-2019 人人开源 All rights reserved.
 *
 * https://www.renren.io
 *
 * 版权所有，侵权必究！
 */
package com.example.springcloudalibabasentineldemo.utils;
import com.baomidou.mybatisplus.core.metadata.IPage;
import java.io.Serializable;
import java.util.List;
/**
 * @description:分页工具类
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
public class PageUtils implements Serializable {
  private static final long serialVersionUID = 1L;
  /**
   * 总记录数
   */
  private int totalCount;
  /**
   * 每页记录数
   */
  private int pageSize;
  /**
   * 总页数
   */
  private int totalPage;
  /**
   * 当前页数
   */
  private int currPage;
  /**
   * 列表数据
   */
  private List<?> list;
  /**
   * 分页
   * @param list        列表数据
   * @param totalCount  总记录数
   * @param pageSize    每页记录数
   * @param currPage    当前页数
   */
  public PageUtils(List<?> list, int totalCount, int pageSize, int currPage) {
    this.list = list;
    this.totalCount = totalCount;
    this.pageSize = pageSize;
    this.currPage = currPage;
    this.totalPage = (int)Math.ceil((double)totalCount/pageSize);
  }
  /**
   * 分页
   */
  public PageUtils(IPage<?> page) {
    this.list = page.getRecords();
    this.totalCount = (int)page.getTotal();
    this.pageSize = (int)page.getSize();
    this.currPage = (int)page.getCurrent();
    this.totalPage = (int)page.getPages();
  }
  public int getTotalCount() {
    return totalCount;
  }
  public void setTotalCount(int totalCount) {
    this.totalCount = totalCount;
  }
  public int getPageSize() {
    return pageSize;
  }
  public void setPageSize(int pageSize) {
    this.pageSize = pageSize;
  }
  public int getTotalPage() {
    return totalPage;
  }
  public void setTotalPage(int totalPage) {
    this.totalPage = totalPage;
  }
  public int getCurrPage() {
    return currPage;
  }
  public void setCurrPage(int currPage) {
    this.currPage = currPage;
  }
  public List<?> getList() {
    return list;
  }
  public void setList(List<?> list) {
    this.list = list;
  }
}

/**
 * Copyright (c) 2016-2019 人人开源 All rights reserved.
 *
 * https://www.renren.io
 *
 * 版权所有，侵权必究！
 */
package com.example.springcloudalibabasentineldemo.utils;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.core.metadata.OrderItem;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.example.springcloudalibabasentineldemo.xss.SQLFilter;
import org.apache.commons.lang.StringUtils;
import java.util.Map;
/**
 * @description:查询参数
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
public class Query<T> {
    public IPage<T> getPage(Map<String, Object> params) {
        return this.getPage(params, null, false);
    }
    public IPage<T> getPage(Map<String, Object> params, String defaultOrderField, boolean isAsc) {
        //分页参数
        long curPage = 1;
        long limit = 10;
        if(params.get(Constant.PAGE) != null){
            curPage = Long.parseLong((String)params.get(Constant.PAGE));
        }
        if(params.get(Constant.LIMIT) != null){
            limit = Long.parseLong((String)params.get(Constant.LIMIT));
        }
        //分页对象
        Page<T> page = new Page<>(curPage, limit);
        //分页参数
        params.put(Constant.PAGE, page);
        //排序字段
        //防止SQL注入（因为sidx、order是通过拼接SQL实现排序的，会有SQL注入风险）
        String orderField = SQLFilter.sqlInject((String)params.get(Constant.ORDER_FIELD));
        String order = (String)params.get(Constant.ORDER);
        //前端字段排序
        if(StringUtils.isNotEmpty(orderField) && StringUtils.isNotEmpty(order)){
            if(Constant.ASC.equalsIgnoreCase(order)) {
                return  page.addOrder(OrderItem.asc(orderField));
            }else {
                return page.addOrder(OrderItem.desc(orderField));
            }
        }
        //没有排序字段，则不排序
        if(StringUtils.isBlank(defaultOrderField)){
            return page;
        }
        //默认排序
        if(isAsc) {
            page.addOrder(OrderItem.asc(defaultOrderField));
        }else {
            page.addOrder(OrderItem.desc(defaultOrderField));
        }
        return page;
    }
}

/**
 * Copyright (c) 2016-2019 人人开源 All rights reserved.
 *
 * https://www.renren.io
 *
 * 版权所有，侵权必究！
 */
package com.example.springcloudalibabasentineldemo.utils;
import org.apache.http.HttpStatus;
import java.util.HashMap;
import java.util.Map;
/**
 * @description:返回数据
 * @author: zhiweiLiao
 * @date: 2022-09-13 15:28
 */
public class R extends HashMap<String, Object> {
  private static final long serialVersionUID = 1L;
  public R() {
    put("code", 0);
    put("msg", "success");
  }
  public static R error() {
    return error(HttpStatus.SC_INTERNAL_SERVER_ERROR, "未知异常，请联系管理员");
  }
  public static R error(String msg) {
    return error(HttpStatus.SC_INTERNAL_SERVER_ERROR, msg);
  }
  public static R error(int code, String msg) {
    R r = new R();
    r.put("code", code);
    r.put("msg", msg);
    return r;
  }
  public static R ok(String msg) {
    R r = new R();
    r.put("msg", msg);
    return r;
  }
  public static R ok(Map<String, Object> map) {
    R r = new R();
    r.putAll(map);
    return r;
  }
  public static R ok() {
    return new R();
  }
  public R put(String key, Object value) {
    super.put(key, value);
    return this;
  }
}

package com.example.springcloudalibabasentineldemo.xss;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
 *
 * HTML filtering utility for protecting against XSS (Cross Site Scripting).
 *
 * This code is licensed LGPLv3
 *
 * This code is a Java port of the original work in PHP by Cal Hendersen.
 * http://code.iamcal.com/php/lib_filter/
 *
 * The trickiest part of the translation was handling the differences in regex handling
 * between PHP and Java.  These resources were helpful in the process:
 *
 * http://java.sun.com/j2se/1.4.2/docs/api/java/util/regex/Pattern.html
 * http://us2.php.net/manual/en/reference.pcre.pattern.modifiers.php
 * http://www.regular-expressions.info/modifiers.html
 *
 * A note on naming conventions: instance variables are prefixed with a "v"; global
 * constants are in all caps.
 *
 * Sample use:
 * String input = ...
 * String clean = new HTMLFilter().filter( input );
 *
 * The class is not thread safe. Create a new instance if in doubt.
 *
 * If you find bugs or have suggestions on improvement (especially regarding
 * performance), please contact us.  The latest version of this
 * source, and our contact details, can be found at http://xss-html-filter.sf.net
 *
 * @author Joseph O'Connell
 * @author Cal Hendersen
 * @author Michael Semb Wever
 */
public final class HTMLFilter {
    /** regex flag union representing /si modifiers in php **/
    private static final int REGEX_FLAGS_SI = Pattern.CASE_INSENSITIVE | Pattern.DOTALL;
    private static final Pattern P_COMMENTS = Pattern.compile("<!--(.*?)-->", Pattern.DOTALL);
    private static final Pattern P_COMMENT = Pattern.compile("^!--(.*)--$", REGEX_FLAGS_SI);
    private static final Pattern P_TAGS = Pattern.compile("<(.*?)>", Pattern.DOTALL);
    private static final Pattern P_END_TAG = Pattern.compile("^/([a-z0-9]+)", REGEX_FLAGS_SI);
    private static final Pattern P_START_TAG = Pattern.compile("^([a-z0-9]+)(.*?)(/?)$", REGEX_FLAGS_SI);
    private static final Pattern P_QUOTED_ATTRIBUTES = Pattern.compile("([a-z0-9]+)=([\"'])(.*?)\\2", REGEX_FLAGS_SI);
    private static final Pattern P_UNQUOTED_ATTRIBUTES = Pattern.compile("([a-z0-9]+)(=)([^\"\\s']+)", REGEX_FLAGS_SI);
    private static final Pattern P_PROTOCOL = Pattern.compile("^([^:]+):", REGEX_FLAGS_SI);
    private static final Pattern P_ENTITY = Pattern.compile("&#(\\d+);?");
    private static final Pattern P_ENTITY_UNICODE = Pattern.compile("&#x([0-9a-f]+);?");
    private static final Pattern P_ENCODE = Pattern.compile("%([0-9a-f]{2});?");
    private static final Pattern P_VALID_ENTITIES = Pattern.compile("&([^&;]*)(?=(;|&|$))");
    private static final Pattern P_VALID_QUOTES = Pattern.compile("(>|^)([^<]+?)(<|$)", Pattern.DOTALL);
    private static final Pattern P_END_ARROW = Pattern.compile("^>");
    private static final Pattern P_BODY_TO_END = Pattern.compile("<([^>]*?)(?=<|$)");
    private static final Pattern P_XML_CONTENT = Pattern.compile("(^|>)([^<]*?)(?=>)");
    private static final Pattern P_STRAY_LEFT_ARROW = Pattern.compile("<([^>]*?)(?=<|$)");
    private static final Pattern P_STRAY_RIGHT_ARROW = Pattern.compile("(^|>)([^<]*?)(?=>)");
    private static final Pattern P_AMP = Pattern.compile("&");
    private static final Pattern P_QUOTE = Pattern.compile("<");
    private static final Pattern P_LEFT_ARROW = Pattern.compile("<");
    private static final Pattern P_RIGHT_ARROW = Pattern.compile(">");
    private static final Pattern P_BOTH_ARROWS = Pattern.compile("<>");
    // @xxx could grow large... maybe use sesat's ReferenceMap
    private static final ConcurrentMap<String,Pattern> P_REMOVE_PAIR_BLANKS = new ConcurrentHashMap<String, Pattern>();
    private static final ConcurrentMap<String,Pattern> P_REMOVE_SELF_BLANKS = new ConcurrentHashMap<String, Pattern>();
    /** set of allowed html elements, along with allowed attributes for each element **/
    private final Map<String, List<String>> vAllowed;
    /** counts of open tags for each (allowable) html element **/
    private final Map<String, Integer> vTagCounts = new HashMap<String, Integer>();
    /** html elements which must always be self-closing (e.g. "<img />") **/
    private final String[] vSelfClosingTags;
    /** html elements which must always have separate opening and closing tags (e.g. "<b></b>") **/
    private final String[] vNeedClosingTags;
    /** set of disallowed html elements **/
    private final String[] vDisallowed;
    /** attributes which should be checked for valid protocols **/
    private final String[] vProtocolAtts;
    /** allowed protocols **/
    private final String[] vAllowedProtocols;
    /** tags which should be removed if they contain no content (e.g. "<b></b>" or "<b />") **/
    private final String[] vRemoveBlanks;
    /** entities allowed within html markup **/
    private final String[] vAllowedEntities;
    /** flag determining whether comments are allowed in input String. */
    private final boolean stripComment;
    private final boolean encodeQuotes;
    private boolean vDebug = false;
    /**
     * flag determining whether to try to make tags when presented with "unbalanced"
     * angle brackets (e.g. "<b text </b>" becomes "<b> text </b>").  If set to false,
     * unbalanced angle brackets will be html escaped.
     */
    private final boolean alwaysMakeTags;
    /** Default constructor.
     *
     */
    public HTMLFilter() {
        vAllowed = new HashMap<>();
        final ArrayList<String> a_atts = new ArrayList<String>();
        a_atts.add("href");
        a_atts.add("target");
        vAllowed.put("a", a_atts);
        final ArrayList<String> img_atts = new ArrayList<String>();
        img_atts.add("src");
        img_atts.add("width");
        img_atts.add("height");
        img_atts.add("alt");
        vAllowed.put("img", img_atts);
        final ArrayList<String> no_atts = new ArrayList<String>();
        vAllowed.put("b", no_atts);
        vAllowed.put("strong", no_atts);
        vAllowed.put("i", no_atts);
        vAllowed.put("em", no_atts);
        vSelfClosingTags = new String[]{"img"};
        vNeedClosingTags = new String[]{"a", "b", "strong", "i", "em"};
        vDisallowed = new String[]{};
        vAllowedProtocols = new String[]{"http", "mailto", "https"}; // no ftp.
        vProtocolAtts = new String[]{"src", "href"};
        vRemoveBlanks = new String[]{"a", "b", "strong", "i", "em"};
        vAllowedEntities = new String[]{"amp", "gt", "lt", "quot"};
        stripComment = true;
        encodeQuotes = true;
        alwaysMakeTags = true;
    }
    /** Set debug flag to true. Otherwise use default settings. See the default constructor.
     *
     * @param debug turn debug on with a true argument
     */
    public HTMLFilter(final boolean debug) {
        this();
        vDebug = debug;
    }
    /** Map-parameter configurable constructor.
     *
     * @param conf map containing configuration. keys match field names.
     */
    public HTMLFilter(final Map<String,Object> conf) {
        assert conf.containsKey("vAllowed") : "configuration requires vAllowed";
        assert conf.containsKey("vSelfClosingTags") : "configuration requires vSelfClosingTags";
        assert conf.containsKey("vNeedClosingTags") : "configuration requires vNeedClosingTags";
        assert conf.containsKey("vDisallowed") : "configuration requires vDisallowed";
        assert conf.containsKey("vAllowedProtocols") : "configuration requires vAllowedProtocols";
        assert conf.containsKey("vProtocolAtts") : "configuration requires vProtocolAtts";
        assert conf.containsKey("vRemoveBlanks") : "configuration requires vRemoveBlanks";
        assert conf.containsKey("vAllowedEntities") : "configuration requires vAllowedEntities";
        vAllowed = Collections.unmodifiableMap((HashMap<String, List<String>>) conf.get("vAllowed"));
        vSelfClosingTags = (String[]) conf.get("vSelfClosingTags");
        vNeedClosingTags = (String[]) conf.get("vNeedClosingTags");
        vDisallowed = (String[]) conf.get("vDisallowed");
        vAllowedProtocols = (String[]) conf.get("vAllowedProtocols");
        vProtocolAtts = (String[]) conf.get("vProtocolAtts");
        vRemoveBlanks = (String[]) conf.get("vRemoveBlanks");
        vAllowedEntities = (String[]) conf.get("vAllowedEntities");
        stripComment =  conf.containsKey("stripComment") ? (Boolean) conf.get("stripComment") : true;
        encodeQuotes = conf.containsKey("encodeQuotes") ? (Boolean) conf.get("encodeQuotes") : true;
        alwaysMakeTags = conf.containsKey("alwaysMakeTags") ? (Boolean) conf.get("alwaysMakeTags") : true;
    }
    private void reset() {
        vTagCounts.clear();
    }
    private void debug(final String msg) {
        if (vDebug) {
            Logger.getAnonymousLogger().info(msg);
        }
    }
    //---------------------------------------------------------------
    // my versions of some PHP library functions
    public static String chr(final int decimal) {
        return String.valueOf((char) decimal);
    }
    public static String htmlSpecialChars(final String s) {
        String result = s;
        result = regexReplace(P_AMP, "&amp;", result);
        result = regexReplace(P_QUOTE, "&quot;", result);
        result = regexReplace(P_LEFT_ARROW, "&lt;", result);
        result = regexReplace(P_RIGHT_ARROW, "&gt;", result);
        return result;
    }
    //---------------------------------------------------------------
    /**
     * given a user submitted input String, filter out any invalid or restricted
     * html.
     *
     * @param input text (i.e. submitted by a user) than may contain html
     * @return "clean" version of input, with only valid, whitelisted html elements allowed
     */
    public String filter(final String input) {
        reset();
        String s = input;
        debug("************************************************");
        debug("              INPUT: " + input);
        s = escapeComments(s);
        debug("     escapeComments: " + s);
        s = balanceHTML(s);
        debug("        balanceHTML: " + s);
        s = checkTags(s);
        debug("          checkTags: " + s);
        s = processRemoveBlanks(s);
        debug("processRemoveBlanks: " + s);
        s = validateEntities(s);
        debug("    validateEntites: " + s);
        debug("************************************************\n\n");
        return s;
    }
    public boolean isAlwaysMakeTags(){
        return alwaysMakeTags;
    }
    public boolean isStripComments(){
        return stripComment;
    }
    private String escapeComments(final String s) {
        final Matcher m = P_COMMENTS.matcher(s);
        final StringBuffer buf = new StringBuffer();
        if (m.find()) {
            final String match = m.group(1); //(.*?)
            m.appendReplacement(buf, Matcher.quoteReplacement("<!--" + htmlSpecialChars(match) + "-->"));
        }
        m.appendTail(buf);
        return buf.toString();
    }
    private String balanceHTML(String s) {
        if (alwaysMakeTags) {
            //
            // try and form html
            //
            s = regexReplace(P_END_ARROW, "", s);
            s = regexReplace(P_BODY_TO_END, "<$1>", s);
            s = regexReplace(P_XML_CONTENT, "$1<$2", s);
        } else {
            //
            // escape stray brackets
            //
            s = regexReplace(P_STRAY_LEFT_ARROW, "&lt;$1", s);
            s = regexReplace(P_STRAY_RIGHT_ARROW, "$1$2&gt;<", s);
            //
            // the last regexp causes '<>' entities to appear
            // (we need to do a lookahead assertion so that the last bracket can
            // be used in the next pass of the regexp)
            //
            s = regexReplace(P_BOTH_ARROWS, "", s);
        }
        return s;
    }
    private String checkTags(String s) {
        Matcher m = P_TAGS.matcher(s);
        final StringBuffer buf = new StringBuffer();
        while (m.find()) {
            String replaceStr = m.group(1);
            replaceStr = processTag(replaceStr);
            m.appendReplacement(buf, Matcher.quoteReplacement(replaceStr));
        }
        m.appendTail(buf);
        s = buf.toString();
        // these get tallied in processTag
        // (remember to reset before subsequent calls to filter method)
        for (String key : vTagCounts.keySet()) {
            for (int ii = 0; ii < vTagCounts.get(key); ii++) {
                s += "</" + key + ">";
            }
        }
        return s;
    }
    private String processRemoveBlanks(final String s) {
        String result = s;
        for (String tag : vRemoveBlanks) {
            if(!P_REMOVE_PAIR_BLANKS.containsKey(tag)){
                P_REMOVE_PAIR_BLANKS.putIfAbsent(tag, Pattern.compile("<" + tag + "(\\s[^>]*)?></" + tag + ">"));
            }
            result = regexReplace(P_REMOVE_PAIR_BLANKS.get(tag), "", result);
            if(!P_REMOVE_SELF_BLANKS.containsKey(tag)){
                P_REMOVE_SELF_BLANKS.putIfAbsent(tag, Pattern.compile("<" + tag + "(\\s[^>]*)?/>"));
            }
            result = regexReplace(P_REMOVE_SELF_BLANKS.get(tag), "", result);
        }
        return result;
    }
    private static String regexReplace(final Pattern regex_pattern, final String replacement, final String s) {
        Matcher m = regex_pattern.matcher(s);
        return m.replaceAll(replacement);
    }
    private String processTag(final String s) {
        // ending tags
        Matcher m = P_END_TAG.matcher(s);
        if (m.find()) {
            final String name = m.group(1).toLowerCase();
            if (allowed(name)) {
                if (!inArray(name, vSelfClosingTags)) {
                    if (vTagCounts.containsKey(name)) {
                        vTagCounts.put(name, vTagCounts.get(name) - 1);
                        return "</" + name + ">";
                    }
                }
            }
        }
        // starting tags
        m = P_START_TAG.matcher(s);
        if (m.find()) {
            final String name = m.group(1).toLowerCase();
            final String body = m.group(2);
            String ending = m.group(3);
            //debug( "in a starting tag, name='" + name + "'; body='" + body + "'; ending='" + ending + "'" );
            if (allowed(name)) {
                String params = "";
                final Matcher m2 = P_QUOTED_ATTRIBUTES.matcher(body);
                final Matcher m3 = P_UNQUOTED_ATTRIBUTES.matcher(body);
                final List<String> paramNames = new ArrayList<String>();
                final List<String> paramValues = new ArrayList<String>();
                while (m2.find()) {
                    paramNames.add(m2.group(1)); //([a-z0-9]+)
                    paramValues.add(m2.group(3)); //(.*?)
                }
                while (m3.find()) {
                    paramNames.add(m3.group(1)); //([a-z0-9]+)
                    paramValues.add(m3.group(3)); //([^\"\\s']+)
                }
                String paramName, paramValue;
                for (int ii = 0; ii < paramNames.size(); ii++) {
                    paramName = paramNames.get(ii).toLowerCase();
                    paramValue = paramValues.get(ii);
//          debug( "paramName='" + paramName + "'" );
//          debug( "paramValue='" + paramValue + "'" );
//          debug( "allowed? " + vAllowed.get( name ).contains( paramName ) );
                    if (allowedAttribute(name, paramName)) {
                        if (inArray(paramName, vProtocolAtts)) {
                            paramValue = processParamProtocol(paramValue);
                        }
                        params += " " + paramName + "=\"" + paramValue + "\"";
                    }
                }
                if (inArray(name, vSelfClosingTags)) {
                    ending = " /";
                }
                if (inArray(name, vNeedClosingTags)) {
                    ending = "";
                }
                if (ending == null || ending.length() < 1) {
                    if (vTagCounts.containsKey(name)) {
                        vTagCounts.put(name, vTagCounts.get(name) + 1);
                    } else {
                        vTagCounts.put(name, 1);
                    }
                } else {
                    ending = " /";
                }
                return "<" + name + params + ending + ">";
            } else {
                return "";
            }
        }
        // comments
        m = P_COMMENT.matcher(s);
        if (!stripComment && m.find()) {
            return  "<" + m.group() + ">";
        }
        return "";
    }
    private String processParamProtocol(String s) {
        s = decodeEntities(s);
        final Matcher m = P_PROTOCOL.matcher(s);
        if (m.find()) {
            final String protocol = m.group(1);
            if (!inArray(protocol, vAllowedProtocols)) {
                // bad protocol, turn into local anchor link instead
                s = "#" + s.substring(protocol.length() + 1, s.length());
                if (s.startsWith("#//")) {
                    s = "#" + s.substring(3, s.length());
                }
            }
        }
        return s;
    }
    private String decodeEntities(String s) {
        StringBuffer buf = new StringBuffer();
        Matcher m = P_ENTITY.matcher(s);
        while (m.find()) {
            final String match = m.group(1);
            final int decimal = Integer.decode(match).intValue();
            m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal)));
        }
        m.appendTail(buf);
        s = buf.toString();
        buf = new StringBuffer();
        m = P_ENTITY_UNICODE.matcher(s);
        while (m.find()) {
            final String match = m.group(1);
            final int decimal = Integer.valueOf(match, 16).intValue();
            m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal)));
        }
        m.appendTail(buf);
        s = buf.toString();
        buf = new StringBuffer();
        m = P_ENCODE.matcher(s);
        while (m.find()) {
            final String match = m.group(1);
            final int decimal = Integer.valueOf(match, 16).intValue();
            m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal)));
        }
        m.appendTail(buf);
        s = buf.toString();
        s = validateEntities(s);
        return s;
    }
    private String validateEntities(final String s) {
        StringBuffer buf = new StringBuffer();
        // validate entities throughout the string
        Matcher m = P_VALID_ENTITIES.matcher(s);
        while (m.find()) {
            final String one = m.group(1); //([^&;]*)
            final String two = m.group(2); //(?=(;|&|$))
            m.appendReplacement(buf, Matcher.quoteReplacement(checkEntity(one, two)));
        }
        m.appendTail(buf);
        return encodeQuotes(buf.toString());
    }
    private String encodeQuotes(final String s){
        if(encodeQuotes){
            StringBuffer buf = new StringBuffer();
            Matcher m = P_VALID_QUOTES.matcher(s);
            while (m.find()) {
                final String one = m.group(1); //(>|^)
                final String two = m.group(2); //([^<]+?)
                final String three = m.group(3); //(<|$)
                m.appendReplacement(buf, Matcher.quoteReplacement(one + regexReplace(P_QUOTE, "&quot;", two) + three));
            }
            m.appendTail(buf);
            return buf.toString();
        }else{
            return s;
        }
    }
    private String checkEntity(final String preamble, final String term) {
        return ";".equals(term) && isValidEntity(preamble)
                ? '&' + preamble
                : "&amp;" + preamble;
    }
    private boolean isValidEntity(final String entity) {
        return inArray(entity, vAllowedEntities);
    }
    private static boolean inArray(final String s, final String[] array) {
        for (String item : array) {
            if (item != null && item.equals(s)) {
                return true;
            }
        }
        return false;
    }
    private boolean allowed(final String name) {
        return (vAllowed.isEmpty() || vAllowed.containsKey(name)) && !inArray(name, vDisallowed);
    }
    private boolean allowedAttribute(final String name, final String paramName) {
        return allowed(name) && (vAllowed.isEmpty() || vAllowed.get(name).contains(paramName));
    }
}