Introduction to springboot event monitoring (with code)

This article brings you an introduction to springboot event monitoring (with code). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Define events

@Getter
public class TestEvent extends ApplicationEvent {
   private String msg;

   public TestEvent(Object source, String msg) {
       super(source);
       this.msg = msg;
   }
}

Define event monitoring (annotation method)

 @Component
 public class TestListen {
   @EventListener
   public void testListen(TestEvent event) {
       System.out.println(event.getMsg());
   }
}

Note: @Component annotation

Publish event

@Autowired
private ApplicationContext publiser;

@GetMapping("test-listen")
public void testListen() {
    for (int i = 0; i < 10; i++) {
        System.out.println("i = " + i);
    }
    publiser.publishEvent(new TestEvent(this, "测试事件监听"));
    for (int j = 0; j < 10; j++) {
       System.out.println("j = " + j);
   }
}

Execution sequence during testing:

1. i loop
2. Print "event = [test event listening]"
3. j loop

Asynchronous monitoring

Listening plus @Async annotation

@Component
public class TestListen {
   @EventListener
   @Async
   public void testListen(TestEvent event) {
       for (int i = 0; i < 10; i++) {
           System.out.println("event = [" + event.getMsg() + "]");
       }
   }
}

Execution order during testing:

1. i loop
2. j loop
3. Print "event = [test event listening]"

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