Spring ApplicationListener的使用详解

介绍

spring applicationlistener 是spring事件机制的一部分,与applicationevent抽象类结合完成applicationcontext的事件通知机制.

contextrefreshedevent事件监听

以spring的内置事件contextrefreshedevent为例,当applicationcontext被初始化或刷新时，会触发contextrefreshedevent事件.如下代码示例:

@component
public class learnlistener implements applicationlistener<contextrefreshedevent> {
  @override
  public void onapplicationevent(contextrefreshedevent event) {
   //获取所有的bean
   string[] definitionnames = event.getapplicationcontext().getbeandefinitionnames();
   for (string name : definitionnames) {
     //打印名称
     system.out.println("name = " + name);
   }
  }
}

自定义事件

代码

//继承applicationevent 抽象类就可以自定义事件模型
public class myevent extends applicationevent {
 
  private long id;
  private string message;
  public myevent(object source) {
    super(source);
  }

  public myevent(object source, long id, string message) {
    super(source);
    this.id = id;
    this.message = message;
  }
  //get set 方法省略
}

//实现applicationlistener接口
  @component
public class mylistener implements applicationlistener<myevent> {
  @override
  public void onapplicationevent(myevent event) {
    system.out.println("监听到事件: "+event.getid()+"\t"+event.getmessage());
  }
}

测试

@springboottest
@runwith(springrunner.class)
public class listenertest {
  @autowired
  private applicationcontext applicationcontext;

  @test
  public void testlistenner() {
    myevent myevent = new myevent("myevent", 9527l, "十二点了 该吃饭了~");
    applicationcontext.publishevent(myevent);
   // system.out.println("发送结束");
  }
}

结果

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