SpringBoot的actuator组件快速使用

       Spring Boot Actuator 组件的主要作用是为 Spring Boot 应用提供生产级监控和管理功能。它让应用能够自我监控和管理，是微服务架构中不可或缺的组件。

  1.引入依赖

      <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency>

  2.application.xml文件配置

management:endpoint:web:exposure:include: "*"health:show-details: alwayshealth:defaults:enabled: false

      上面配置会暴露所有端点，并总是显示健康检查详情，禁用默认的健康检查器（其它端点访问结果为空）。

3.主要端点以及作用

端点	路径	作用
health	/actuator/health	应用健康状态
info	/actuator/info	应用基本信息
metrics	/actuator/metrics	应用指标数据
env	/actuator/env	环境配置信息
configprops	/actuator/configprops	配置属性
beans	/actuator/beans	Spring Beans 信息
mappings	/actuator/mappings	URL 映射信息
loggers	/actuator/loggers	日志配置管理
threaddump	/actuator/threaddump	线程转储
heapdump	/actuator/heapdump	堆内存转储

4.访问端点/actuator/health

启动服务之后。

{"status": "UP","details": {"application": {"status": "UP"}}
}

当启用默认健康检查器时

management:endpoint:web:exposure:include: "*"health:show-details: alwayshealth:defaults:enabled: true

显示信息如下：

{"status": "DOWN","details": {"diskSpace": {"status": "UP","details": {"total": 350731890688,"free": 312695111680,"threshold": 10485760}},"db": {"status": "UP","details": {"database": "MySQL","hello": 1}},"refreshScope": {"status": "UP"},"redis": {"status": "DOWN","details": {"error": "org.springframework.data.redis.RedisConnectionFailureException: Unable to connect to Redis; nested exception is io.lettuce.core.RedisConnectionException: Unable to connect to localhost:6379"}}}
}

5./actuator（显示所有端点的页面）

{"_links": {"self": {"href": "http://localhost:8080/lams-portal/actuator","templated": false},"health": {"href": "http://localhost:8080/lams-portal/actuator/health","templated": false},"health-component-instance": {"href": "http://localhost:8080/lams-portal/actuator/health/{component}/{instance}","templated": true},"health-component": {"href": "http://localhost:8080/lams-portal/actuator/health/{component}","templated": true},"info": {"href": "http://localhost:8080/lams-portal/actuator/info","templated": false}}
}

6.访问其它端点显示为空（没有配置）