声明：代码是JavaEE开发的颠覆者 Spring Boot实战代码中的，我买了这书，并练习

1自定义事件

[code]public class DemoEvent extends ApplicationEvent{
private static final long serialVersionUID = 1L;
public String msg;

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

2定义监听者，对被监听的对象进行处理

[code]@Component
public class DemoListener implements ApplicationListener<DemoEvent> {//设置要监听的类
@Override
//对监听对象进行处理
public void onApplicationEvent(DemoEvent event) {
//被监听的对象
String msg = event.msg;
System.out.println("DemoListener监听到DemoEvent发布的消息:"+ msg);
}
}

3发布监听

[code]
@Component
public class DemoPublisher {
@Autowired
ApplicationContext applicationContext;
//发布事件
public void publish(String msg){
applicationContext.publishEvent(new DemoEvent(this, msg));
}

}

4配置类

[code]
@Configuration
@ComponentScan("com.wisely.highlight_spring4.ch2.event")
public class EventConfig {

}

测试

[code]package com.wisely.highlight_spring4.ch2.event;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class Main {
public static void main(String[] args) {
AnnotationConfigApplicationContext context =
new AnnotationConfigApplicationContext(EventConfig.class);
DemoPublisher demoPublisher = context.getBean(DemoPublisher.class);
demoPublisher.publish("你好");
context.close();
}
}