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。
1 package com.junge.spring.event; 2 3 import com.junge.spring.vo.Mail; 4 5 public class EventTest { 6 7 /** 8 * @param args 9 */ 10 public static void main(String[] args) { 11 FrameEvent frameEvent = new FrameEvent(); 12 13 Mail mail = new Mail(); 14 mail.setContent("accdddount"); 15 mail.setEmail("[email protected]"); 16 17 frameEvent.setPrameter(mail); 18 frameEvent.setEventId("send_mail_notify"); 19 frameEvent.setSync(false); 20 21 FrameEventHolder.publishEvent(frameEvent); 22 } 23 24 }
2.应用上下文保持器ContextHolder.java
1 /** 2 * 3 */ 4 package com.junge.spring.context; 5 6 import org.springframework.context.ApplicationContext; 7 import org.springframework.context.support.ClassPathXmlApplicationContext; 8 9 /** 10 * @author Administrator 11 * 12 */ 13 public class ContextHolder { 14 15 private static ApplicationContext context = null; 16 17 static { 18 context = new ClassPathXmlApplicationContext("event.xml"); 19 } 20 21 public static ApplicationContext getApplicationContext() { 22 return context; 23 } 24 }
3.事件类FrameEvent.java，继承自Spring的ApplicationEvent，可以保持事件处理参数
1 /** 2 * 3 */ 4 package com.junge.spring.event; 5 6 import org.springframework.context.ApplicationEvent; 7 8 /** 9 * @author Administrator 10 * 11 */ 12 public class FrameEvent extends ApplicationEvent { 13 14 private static final long serialVersionUID = 1L; 15 16 /** 17 * 保持事件业务参数 18 */ 19 private Object prameter; 20 21 /** 22 * 一类事件编号 23 */ 24 private String eventId; 25 26 public FrameEvent() { 27 super("source"); 28 } 29 30 public FrameEvent(Object source) { 31 super(source); 32 } 33 34 public Object getPrameter() { 35 return prameter; 36 } 37 38 public void setPrameter(Object prameter) { 39 this.prameter = prameter; 40 } 41 42 public String getEventId() { 43 return eventId; 44 } 45 46 public void setEventId(String eventId) { 47 this.eventId = eventId; 48 } 49 50 }
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
1 package com.junge.spring.event.handler; 2 3 public interface EventHandler { 4 5 /** 6 * 获取事件ID 7 */ 8 String getEventId(); 9 10 /** 11 * 处理事件入口 12 * 13 * @param parameter 14 */ 15 void handle(Object parameter); 16 17 }
6.事件处理接口抽象类FrameEventHandler.java，业务事件处理从该类继承
1 /** 2 * 3 */ 4 package com.junge.spring.event.handler; 5 6 /** 7 * @author Administrator 8 * 9 */ 10 public abstract class FrameEventHandler implements EventHandler { 11 12 private String eventId; 13 14 /** 15 * @param eventId 16 * the eventId to set 17 */ 18 public void setEventId(String eventId) { 19 this.eventId = eventId; 20 } 21 22 /* 23 * (non-Javadoc) 24 * 25 * @see com.junge.spring.event.listener.EventHandler#getEventId() 26 */ 27 @Override 28 public String getEventId() { 29 30 return eventId; 31 } 32 }
7.业务事件处理实现MailEventHandler.java，从FrameEventHandler.java继承，实现handle方法
1 /** 2 * 3 */ 4 package com.junge.spring.event.handler; 5 6 import com.junge.spring.vo.Mail; 7 8 /** 9 * @author Administrator 10 * 11 */ 12 public class MailEventHandler extends FrameEventHandler { 13 14 @Override 15 public void handle(Object parameter) { 16 if (null != parameter) { 17 Mail mail = (Mail) parameter; 18 System.out.println("需要发送邮件给" + mail.getEmail() + "，邮件内容是:" 19 + mail.getContent()); 20 } 21 22 } 23 24 }
8.事件监听器FrameEventListener.java，调用事件业务处理逻辑（即调用handle方法）
1 /** 2 * 3 */ 4 package com.junge.spring.event.listener; 5 6 import org.springframework.context.ApplicationListener; 7 8 import com.junge.spring.event.FrameEvent; 9 import com.junge.spring.event.handler.EventHandler; 10 11 /** 12 * @author Administrator 13 * 14 */ 15 public class FrameEventListener implements ApplicationListener<FrameEvent> { 16 17 private EventHandler eventHandler; 18 19 @Override 20 public void onApplicationEvent(FrameEvent event) { 21 22 if (eventHandler.getEventId().equals(event.getEventId())) { 23 eventHandler.handle(event.getPrameter()); 24 } 25 } 26 27 public EventHandler getEventHandler() { 28 return eventHandler; 29 } 30 31 public void setEventHandler(EventHandler eventHandler) { 32 this.eventHandler = eventHandler; 33 } 34 35 }
9.业务VO对象Mail.java
1 /** 2 * 3 */ 4 package com.junge.spring.vo; 5 6 /** 7 * @author Administrator 8 * 9 */ 10 public class Mail { 11 private String email; 12 13 private String content; 14 15 public String getEmail() { 16 return email; 17 } 18 19 public void setEmail(String email) { 20 this.email = email; 21 } 22 23 public String getContent() { 24 return content; 25 } 26 27 public void setContent(String content) { 28 this.content = content; 29 } 30 }
10.Spring业务配置文件event.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <p:beans xmlns:p="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://www.springframework.org/schema/beans spring-beans-3.2.xsd "> 5 6 <p:bean id="mailHandler" class="com.junge.spring.event.handler.MailEventHandler"> 7 <p:property name="eventId" value="send_mail_notify" /> 8 </p:bean> 9 10 <p:bean id="mailListener" class="com.junge.spring.event.listener.FrameEventListener"> 11 <p:property name="eventHandler" ref="mailHandler" /> 12 </p:bean> 13 </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[email protected]，邮件内容是:accdddount