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"}}
官网：http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/
源代码参考：https://github.com/xujijun/my-spring-boot
