spring的ApplicationEvent使用

1、创建一个MessageEvent事件

package dnn.mytest;
import org.springframework.context.ApplicationEvent;
/**
 * 创建一个信息事件，继承org.springframework.context.ApplicationEvent
 * @author lenovo
 *
 */
public class MessageEvent extends ApplicationEvent {
	private String name;
	private String message;
	private static final long serialVersionUID = 1L;
	public MessageEvent(Object source, String name, String message) {
		super(source);
		// TODO Auto-generated constructor stub
		this.name = name;
		this.message = message;
	}
	public String getText() {
		return name + "：" + message;
	}
}

2、创建一个事件的监听器

package dnn.mytest;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;
@Component
/**
 * 创建一个事件的监听器，实现org.springframework.context.ApplicationListener，同时要注册为组件
 * @author lenovo
 *
 */
public class MessageListener implements ApplicationListener<MessageEvent>{
	/**
	 * 重写onApplicationEvent方法，并且对MessageEvent事件进行处理
	 */
	@Override
	public void onApplicationEvent(MessageEvent event) {
		// TODO Auto-generated method stub
		System.out.println(event.getText());
	}
}

3、创建一个事件的工具类，用来发布事件

package dnn.mytest;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationEvent;
import org.springframework.stereotype.Component;

@Component
/**
 * 创建一个事件发布的工具类，同时注册为组件,实现org.springframework.context.ApplicationContextAware
 * @author lenovo
 *
 */
public class MessageEventUtils implements ApplicationContextAware {
	private static ApplicationContext applicationContext;
	/**
	 * 获取上下文中已经实例化的bean
	 */
	@Override
	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		// TODO Auto-generated method stub
		MessageEventUtils.applicationContext = applicationContext;
	}
	/**
	 * 发布事件的方法，当发布事件的时候会被监听器监听到，同时对事件进行处理
	 * @param applicationEvent
	 */
	public static void publishEvent(ApplicationEvent applicationEvent) {
		applicationContext.publishEvent(applicationEvent);
	}
}

4、测试

package dnn.mytest;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping(value = "/api/test")
public class TestController {
	@GetMapping("/test")
	public void testEvent() {
		// 发布事件
		MessageEventUtils.publishEvent(new MessageEvent("ceshi" , "xujuntao", "hello world"));
	}
}