SpringBoot 官方文档示例：(5)通过Listener获取应用的Availability状态

1.创建listener类：

package cn.edu.tju.component;

import org.springframework.boot.availability.AvailabilityChangeEvent;
import org.springframework.boot.availability.LivenessState;
import org.springframework.context.event.EventListener;
import org.springframework.stereotype.Component;

@Component
public class MyAvailabilityStateExporter {
    @EventListener
    public void onStateChange(AvailabilityChangeEvent<LivenessState> event) {
        switch (event.getState()) {
            case CORRECT:
                System.out.println("correct......");
                break;
            case  BROKEN:
                System.out.println("broken......");
                break;
        }
    }
}

2.触发应用的availability状态改变

package cn.edu.tju.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.availability.AvailabilityChangeEvent;
import org.springframework.boot.availability.LivenessState;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class LivenessController {
    @Autowired
    ApplicationEventPublisher applicationEventPublisher;

    @RequestMapping("/live")
    public String test(){
        AvailabilityChangeEvent.publish(applicationEventPublisher,new NullPointerException("info"),
                LivenessState.BROKEN);
        return "ok";
    }
}

3.接口调用时的输出