Spring中ApplicationEvent和ApplicationListener封装

1.测试程序EventTest.java，发布一个事件只需要调用FrameEventHolder.publishEvent()方法即可。

 package com.junge.spring.event;

 import com.junge.spring.vo.Mail;

 public class EventTest {

     /**
      * @param args
      */
     public static void main(String[] args) {
         FrameEvent frameEvent = new FrameEvent();

         Mail mail = new Mail();
         mail.setContent("accdddount");
         mail.setEmail("333@email.com");

         frameEvent.setPrameter(mail);
         frameEvent.setEventId("send_mail_notify");
         frameEvent.setSync(false);

         FrameEventHolder.publishEvent(frameEvent);
     }

 }

2.应用上下文保持器ContextHolder.java

 /**
  *
  */
 package com.junge.spring.context;

 import org.springframework.context.ApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;

 /**
  * @author Administrator
  *
  */
 public class ContextHolder {

     private static ApplicationContext context = null;

     static {
         context = new ClassPathXmlApplicationContext("event.xml");
     }

     public static ApplicationContext getApplicationContext() {
         return context;
     }
 }

3.事件类FrameEvent.java，继承自Spring的ApplicationEvent，可以保持事件处理参数

 /**
  *
  */
 package com.junge.spring.event;

 import org.springframework.context.ApplicationEvent;

 /**
  * @author Administrator
  *
  */
 public class FrameEvent extends ApplicationEvent {

     private static final long serialVersionUID = 1L;

     /**
      * 保持事件业务参数
      */
     private Object prameter;

     /**
      * 一类事件编号
      */
     private String eventId;

     public FrameEvent() {
         super("source");
     }

     public FrameEvent(Object source) {
         super(source);
     }

     public Object getPrameter() {
         return prameter;
     }

     public void setPrameter(Object prameter) {
         this.prameter = prameter;
     }

     public String getEventId() {
         return eventId;
     }

     public void setEventId(String eventId) {
         this.eventId = eventId;
     }

 }

4.发布事件静态方法 FrameEventHolder.java

package com.junge.spring.event;

import org.springframework.util.Assert;

import com.junge.spring.context.ContextHolder;

public class FrameEventHolder {

	public static void publishEvent(FrameEvent frameEvent) {

		Assert.notNull(frameEvent);

		ContextHolder.getApplicationContext().publishEvent(frameEvent);
	}

}

5.事件处理接口EventHandler.java

 package com.junge.spring.event.handler;

 public interface EventHandler {

     /**
      * 获取事件ID
      */
     String getEventId();

     /**
      * 处理事件入口
      *
      * @param parameter
      */
     void handle(Object parameter);

 }

6.事件处理接口抽象类FrameEventHandler.java，业务事件处理从该类继承

 /**
  *
  */
 package com.junge.spring.event.handler;

 /**
  * @author Administrator
  *
  */
 public abstract class FrameEventHandler implements EventHandler {

     private String eventId;

     /**
      * @param eventId
      *            the eventId to set
      */
     public void setEventId(String eventId) {
         this.eventId = eventId;
     }

     /*
      * (non-Javadoc)
      *
      * @see com.junge.spring.event.listener.EventHandler#getEventId()
      */
     @Override
     public String getEventId() {

         return eventId;
     }
 }

7.业务事件处理实现MailEventHandler.java，从FrameEventHandler.java继承，实现handle方法

 /**
  *
  */
 package com.junge.spring.event.handler;

 import com.junge.spring.vo.Mail;

 /**
  * @author Administrator
  *
  */
 public class MailEventHandler extends FrameEventHandler {

     @Override
     public void handle(Object parameter) {
         if (null != parameter) {
             Mail mail = (Mail) parameter;
             System.out.println("需要发送邮件给" + mail.getEmail() + "，邮件内容是:"
                     + mail.getContent());
         }

     }

 }

8.事件监听器FrameEventListener.java，调用事件业务处理逻辑（即调用handle方法）

 /**
  *
  */
 package com.junge.spring.event.listener;

 import org.springframework.context.ApplicationListener;

 import com.junge.spring.event.FrameEvent;
 import com.junge.spring.event.handler.EventHandler;

 /**
  * @author Administrator
  *
  */
 public class FrameEventListener implements ApplicationListener<FrameEvent> {

     private EventHandler eventHandler;

     @Override
     public void onApplicationEvent(FrameEvent event) {

         if (eventHandler.getEventId().equals(event.getEventId())) {
             eventHandler.handle(event.getPrameter());
         }
     }

     public EventHandler getEventHandler() {
         return eventHandler;
     }

     public void setEventHandler(EventHandler eventHandler) {
         this.eventHandler = eventHandler;
     }

 }

9.业务VO对象Mail.java

 /**
  *
  */
 package com.junge.spring.vo;

 /**
  * @author Administrator
  *
  */
 public class Mail {
     private String email;

     private String content;

     public String getEmail() {
         return email;
     }

     public void setEmail(String email) {
         this.email = email;
     }

     public String getContent() {
         return content;
     }

     public void setContent(String content) {
         this.content = content;
     }
 }

10.Spring业务配置文件event.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <p:beans xmlns:p="http://www.springframework.org/schema/beans"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://www.springframework.org/schema/beans spring-beans-3.2.xsd ">

     <p:bean id="mailHandler" class="com.junge.spring.event.handler.MailEventHandler">
         <p:property name="eventId" value="send_mail_notify" />
     </p:bean>

     <p:bean id="mailListener" class="com.junge.spring.event.listener.FrameEventListener">
         <p:property name="eventHandler" ref="mailHandler" />
     </p:bean>
 </p:beans>

11.测试结果

2015-1-23 14:23:17 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@2808b3: startup date [Fri Jan 23 14:23:17 CST 2015]; root of context hierarchy
2015-1-23 14:23:18 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [event.xml]
2015-1-23 14:23:19 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@db4fa2: defining beans [mailHandler,mailListener]; root of factory hierarchy
需要发送邮件给333@email.com，邮件内容是:accdddount