1 Spring Boot 监控
1.1 Java 监听机制
SpringBoot 的监听机制，其实是对Java提供的事件监听机制的封装。
Java中的事件监听机制定义了以下几个角色：
- 事件：Event，继承 java.util.EventObject 类的对象
- 事件源：Source ，任意对象Object
- 监听器：Listener，实现 java.util.EventListener 接口 的对象
1.2 SpringBoot 监听机制
SpringBoot 在项目run方法启动时，会对几个监听器进行回调，我们可以实现这些监听器接口，在项目启动时完成 一些操作。
ApplicationContextInitializer、SpringApplicationRunListener、CommandLineRunner、ApplicationRunner
新建springboot工程
MyApplicationContextInitializer
package com.itheima.springbootlistener.listener; import org.springframework.context.ApplicationContextInitializer; import org.springframework.context.ConfigurableApplicationContext; import org.springframework.stereotype.Component; @Component public class MyApplicationContextInitializer implements ApplicationContextInitializer { @Override public void initialize(ConfigurableApplicationContext applicationContext) { System.out.println("ApplicationContextInitializer....initialize"); } }
- MySpringApplicationRunListener
package com.itheima.springbootlistener.listener; import org.springframework.boot.SpringApplication; import org.springframework.boot.SpringApplicationRunListener; import org.springframework.context.ConfigurableApplicationContext; import org.springframework.core.env.ConfigurableEnvironment; import org.springframework.stereotype.Component; public class MySpringApplicationRunListener implements SpringApplicationRunListener { public MySpringApplicationRunListener(SpringApplication application, String[] args) { } @Override public void starting() { System.out.println("starting...项目启动中"); } @Override public void environmentPrepared(ConfigurableEnvironment environment) { System.out.println("environmentPrepared...环境对象开始准备"); } @Override public void contextPrepared(ConfigurableApplicationContext context) { System.out.println("contextPrepared...上下文对象开始准备"); } @Override public void contextLoaded(ConfigurableApplicationContext context) { System.out.println("contextLoaded...上下文对象开始加载"); } @Override public void started(ConfigurableApplicationContext context) { System.out.println("started...上下文对象加载完成"); } @Override public void running(ConfigurableApplicationContext context) { System.out.println("running...项目启动完成，开始运行"); } @Override public void failed(ConfigurableApplicationContext context, Throwable exception) { System.out.println("failed...项目启动失败"); } }
- MyCommandLineRunner
package com.itheima.springbootlistener.listener; import org.springframework.boot.CommandLineRunner; import org.springframework.stereotype.Component; import java.util.Arrays; @Component public class MyCommandLineRunner implements CommandLineRunner { @Override public void run(String... args) throws Exception { System.out.println("CommandLineRunner...run"); System.out.println(Arrays.asList(args)); } }
- MyApplicationRunner
package com.itheima.springbootlistener.listener; import org.springframework.boot.ApplicationArguments; import org.springframework.boot.ApplicationRunner; import org.springframework.stereotype.Component; import java.util.Arrays; /** * 当项目启动后执行run方法。 */ @Component public class MyApplicationRunner implements ApplicationRunner { @Override public void run(ApplicationArguments args) throws Exception { System.out.println("ApplicationRunner...run"); System.out.println(Arrays.asList(args.getSourceArgs())); } }
META-INF/spring.factories
org.springframework.context.ApplicationContextInitializer=com.itheima.springbootlistener.listener.MyApplicationContextInitializer org.springframework.boot.SpringApplicationRunListener=com.itheima.springbootlistener.listener.MySpringApplicationRunListener
1.3 总结
springboot提供的监听器如下
- ApplicationContextInitializer、
- SpringApplicationRunListener、
- CommandLineRunner、
- ApplicationRunner
当springboot启动的时候会自动执行监听器中的方法。
其中CommandLineRunner、ApplicationRunner通过加@Component即可直接剩下。剩下的两个需要配置到spring.factories文件中才能生效
2 SpringBoot监控-actuator基本使用
2.1 使用步骤
第一步导入依赖
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency>
第二步访问http://localhost:8080/acruator页面查看信息
{ "_links":{ "self":{ "href":"http://localhost:8080/actuator", "templated":false }, "health":{ "href":"http://localhost:8080/actuator/health", "templated":false }, "health-component-instance":{ "href":"http://localhost:8080/actuator/health/{component}/{instance}", "templated":true }, "health-component":{ "href":"http://localhost:8080/actuator/health/{component}", "templated":true }, "info":{ "href":"http://localhost:8080/actuator/info", "templated":false } } }
通过网址查看配置信息，比如配置信息如下
info.name=lucy info.age=99
查看地址http://localhost:8080/actuator/info ,其中info表示配置文件的前缀
2.2 配置信息
开启健康检查详细信息
management.endpoint.health.show-details=always
开启所有endpoint
management.endpoints.web.exposure.include=*
3 SpringBoot admin图形化工具
因为actuator查看数据不方便，所以使用admin
3.1 使用步骤
第一步创建server
<dependency> <groupId>de.codecentric</groupId> <artifactId>spring-boot-admin-starter-server</artifactId> </dependency>
在启动类上添加@EnableAdminServer
第二步创建client
<dependency> <groupId>de.codecentric</groupId> <artifactId>spring-boot-admin-starter-client</artifactId> </dependency>
spring.boot.admin.client.url=http://localhost:9000
management.endpoint.health.show-details=always
management.endpoints.web.exposure.include=*
第三步
启动server和client，访问server即可
4 SpringBoot项目部署
4.1 指定打包名称
<build> <finalName>springboot</finalName> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>
方式1
直接打jar包，运行jar包即可 java -jar xxx.jar
方式2
打war包，发布到tomcat中，打包前需要修改启动类，让启动类继承SpringBootServletInitializer，并重写configure方法
@SpringBootApplication public class SpringbootDeployApplication extends SpringBootServletInitializer { public static void main(String[] args) { SpringApplication.run(SpringbootDeployApplication.class, args); } @Override protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) { return builder.sources(SpringbootDeployApplication.class); } }
