spring-boot actuator（监控）配置和使用
在生产环境中，需要实时或定期监控服务的可用性。spring-boot 的actuator（监控）功能提供了很多监控所需的接口。简单的配置和使用如下：
1、引入依赖：
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-actuator</artifactId>
- </dependency>
如果使用http调用的方式，还需要这个依赖：
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-web</artifactId>
- </dependency>
2、配置：
application.yml中指定监控的HTTP端口（如果不指定，则使用和server相同的端口）；指定去掉某项的检查（比如不监控health.mail）：
- server:
- port: 8082
- management:
- port: 54001
- health:
- mail:
- enabled: false
3、使用：
查看health指标：http://localhost:54001/health
- {"status":"UP","diskSpace":{"status":"UP","total":120031539200,"free":33554337792,"threshold":10485760},"db":{"status":"UP","dataSource1":{"status":"UP","database":"MySQL","hello":1},"dataSource2":{"status":"UP","database":"MySQL","hello":1}}}
4、自定义指标：
4.1 /health：在某个类中implements HealthIndicator接口，然后实现其中的health()方法即可：
代码：
- @SpringBootApplication
- @EnableScheduling
- public class MySpringBootApplication implements HealthIndicator{
- private static Logger logger = LoggerFactory.getLogger(MySpringBootApplication.class);
- public static void main(String[] args) {
- SpringApplication.run(MySpringBootApplication.class, args);
- logger.info("My Spring Boot Application Started");
- }
- /**
- * 在/health接口调用的时候，返回多一个属性："mySpringBootApplication":{"status":"UP","hello":"world"}
- */
- @Override
- public Health health() {
- return Health.up().withDetail("hello", "world").build();
- }
- }
/health 运行结果（注意第二个指标）：
{"status":"UP","mySpringBootApplication":{"status":"UP","hello":"world"},"diskSpace":{"status":"UP","total":120031539200,"free":33554337792,"threshold":10485760},"db":{"status":"UP","dataSource1":{"status":"UP","database":"MySQL","hello":1},"dataSource2":{"status":"UP","database":"MySQL","hello":1}}}
4.2 /info：配置如下，可以直接给一个字符串，也可以从pom.xml配置中获取
- info:
- app:
- name: "@project.name@" #从pom.xml中获取
- description: "@project.description@"
- version: "@project.version@"
- spring-boot-version: "@project.parent.version@"
/info的结果如下：
{"app":{"name":"my-spring-boot","description":"Test Project for Spring Boot","version":"1.0","spring-boot-version":"1.3.6.RELEASE"}}
