Java负载均衡简介及快速入门并实战（有源码）（下）-阿里云开发者社区

Java负载均衡简介及快速入门并实战（有源码）（下）

2022-12-13 199

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本文涉及的产品

传统型负载均衡 CLB，每月750个小时 15LCU

RDS MySQL Serverless 基础系列，0.5-2RCU 50GB

云数据库 RDS MySQL，集群版 2核4GB 100GB

简介： Java负载均衡是什么？将负载（工作任务，访问请求）进行分摊到多个操作单元（服务器，组件）上执行服务端：服务提供端，比如nginx负载均衡客户端：服务请求方，在发送请求之前已经选好了由哪个实例处理请求。

nacos-provider是生成者服务

接下来上全部代码

1、pom.xml

<?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>cn.nacos.consumer</groupId>
  <artifactId>nacos-consumer</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>nacos-consumer</name>
  <description>Demo project for Spring Boot</description>
  <properties>
    <java.version>1.8</java.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <spring-boot.version>2.1.0.RELEASE</spring-boot.version>
  </properties>
  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
      <exclusions>
        <exclusion>
          <groupId>org.junit.vintage</groupId>
          <artifactId>junit-vintage-engine</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <!--nacos依赖-->
    <dependency>
      <groupId>com.alibaba.cloud</groupId>
      <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
      <version>2.0.1.RELEASE</version>
    </dependency>
    <!--openfeign依赖-->
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-openfeign</artifactId>
      <version>2.1.1.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.16.10</version>
    </dependency>
    <dependency>
      <groupId>io.swagger</groupId>
      <artifactId>swagger-annotations</artifactId>
      <version>1.5.13</version>
    </dependency>
    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-boot-starter</artifactId>
      <version>3.2.0</version>
    </dependency>
  </dependencies>
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>${spring-boot.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
          <encoding>UTF-8</encoding>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
</project>

2、application.yml配置

server:
  port: 8087
spring:
  application:
    name: nacos-consumer
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
  #mysql config
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/study_cloud?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&useSSL=false
    username: root
    password: root
  main:
    allow-bean-definition-overriding: true
logging:
  level:
    root: info
    org.springframework: info
mybatis-plus:
  mapper-locations: classpath*:xml
  type-aliases-package: com.example.nacosprovider.entity
nacos-provider: #调用提供者名称
  ribbon:
    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule

3、ConsumerController

@@RestController
@Slf4j
public class ConsumerController {
  @Autowired
  private RestTemplate restTemplate;
  @ApiOperation("负载均衡")
  @GetMapping("/loadBalance")
  public String loadBalance() {
    //调用生产者微服务
    String forObject = restTemplate.getForObject("http://nacos-provider/provider/", String.class);
    return  "-------" + forObject;
  }
}