ApplicationEvent and ApplicationListener encapsulation in Spring, applicationlistener

ApplicationEvent and ApplicationListener encapsulation in Spring, applicationlistener

1. Test Program EventTest. java. To publish an event, you only need to call the FrameEventHolder. publishEvent () method.

 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("333@email.com");16 17         frameEvent.setPrameter(mail);18         frameEvent.setEventId("send_mail_notify");19         frameEvent.setSync(false);20 21         FrameEventHolder.publishEvent(frameEvent);22     }23 24 }

 

2. Application context holder 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 Administrator11  * 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. The event class FrameEvent. java inherits from Spring's ApplicationEvent and can maintain the event processing parameters.

1/** 2*3 */4 package com. junge. spring. event; 5 6 import org. springframework. context. applicationEvent; 7 8/** 9 * @ author Administrator10 * 11 */12 public class FrameEvent extends ApplicationEvent {13 14 private static final long serialVersionUID = 1L; 15 16/** 17 * keep event service parameters 18 */19 private Object prameter; 20 21/** 22 * Class I event No. 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. Static Method for releasing events 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. event processing interface EventHandler. java

1 package com. junge. spring. event. handler; 2 3 public interface EventHandler {4 5/** 6 * Get event ID 7 */8 String getEventId (); 9 10/** 11 * event handling portal 12*13 * @ param parameter14 */15 void handle (Object parameter); 16 17}

6. the abstract class FrameEventHandler. java of the event processing interface inherits from this class.

 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 eventId16      *            the eventId to set17      */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     @Override28     public String getEventId() {29 30         return eventId;31     }32 }

7. Implement MailEventHandler. java for business event processing, inherit from FrameEventHandler. java, and implement the handle Method

1/** 2*3 */4 package com. junge. spring. event. handler; 5 6 import com. junge. spring. vo. mail; 7 8/** 9 * @ author Administrator10 * 11 */12 public class MailEventHandler extends FrameEventHandler {13 14 @ Override15 public void handle (Object parameter) {16 if (null! = Parameter) {17 Mail mail = (Mail) parameter; 18 System. out. println ("emails to be sent" + mail. getEmail () + ", email content:" 19 + mail. getContent (); 20} 21 22} 23 24}

8. The event listener FrameEventListener. java calls the event business processing logic (that is, the handle method)

 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 Administrator13  * 14  */15 public class FrameEventListener implements ApplicationListener<FrameEvent> {16 17     private EventHandler eventHandler;18 19     @Override20     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. Business VO object 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 business configuration file 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. Test Results

14:23:17 org. springframework. context. support. abstractApplicationContext prepareRefresh information: Refreshing org. springframework. context. support. classPathXmlApplicationContext @ 2808b3: startup date [Fri Jan 23 14:23:17 CST 2015]; root of context hierarchy2015-1-23 14:23:18 org. springframework. beans. factory. xml. xmlBeanDefinitionReader loadBeanDefinitions information: Loading XML bean definitions from class path resource [event. xml] 14:23:19 org. springframework. beans. factory. support. defaultListableBeanFactory preInstantiateSingletons: Pre-instantiating singletons in org. springframework. beans. factory. support. defaultListableBeanFactory @ db4fa2: defining beans [mailHandler, mailListener]; root of factory hierarchy needs to send an email to the 333@email.com with the content of accdddount