Spring 事件机制

通过模拟邮件的发送，说明Spring的事件监听机制

事件类

 package org.zln.module_chapter2.event;

 import org.springframework.context.ApplicationContext;
 import org.springframework.context.event.ApplicationContextEvent;

 /**
  * 发送邮件事件类
  * Created by sherry on 000005/7/5 22:10.
  */

 public class MailSendEvent extends ApplicationContextEvent {

     private String to;
     public MailSendEvent(ApplicationContext source,String to) {
         super(source);
         this.to = to;
     }

     public String getTo(){
         return this.to;
     }
 }

D:\GitHub\tools\JavaEEDevelop\Lesson17_JavaWebDemo\src\org\zln\module_chapter2\event\MailSendEvent.java

事件监听类

 package org.zln.module_chapter2.event;

 import org.springframework.context.ApplicationListener;

 /**
  * 邮件发送 监听类
  * Created by sherry on 000005/7/5 22:12.
  */

 public class MailSendListener implements ApplicationListener<MailSendEvent> {

     /*对MailSendEvent进行处理*/
     @Override
     public void onApplicationEvent(MailSendEvent mailSendEvent) {
         MailSendEvent mailSendEvent1 = mailSendEvent;
         System.out.println("MailSendListener:向"+mailSendEvent1.getTo()+"发送一封邮件");
     }
 }
     

D:\GitHub\tools\JavaEEDevelop\Lesson17_JavaWebDemo\src\org\zln\module_chapter2\event\MailSendListener.java

事件动作

 package org.zln.module_chapter2.event;

 import org.springframework.beans.BeansException;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationContextAware;

 /**
  * 邮件发送类
  * Created by sherry on 000005/7/5 22:15.
  */
 public class MailSender implements ApplicationContextAware{
     private ApplicationContext applicationContext;
     @Override
     public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
         this.applicationContext = applicationContext;
     }

     public void sendMail(String to){
         System.out.println("MailSender:模拟发送邮件");
         MailSendEvent mailSendEvent = new MailSendEvent(applicationContext,to);
         /*向容器中所有事件监听器发送事件*/
         applicationContext.publishEvent(mailSendEvent);
     }
 }

D:\GitHub\tools\JavaEEDevelop\Lesson17_JavaWebDemo\src\org\zln\module_chapter2\event\MailSender.java

事件注册

    <!--事件-->
    <bean class="org.zln.module_chapter2.event.MailSendListener"/>
    <bean id="mailSender" class="org.zln.module_chapter2.event.MailSender"/>

测试

package org.zln.module_chapter2.event;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import static org.junit.Assert.*;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"/org/zln/cfg/spring/applicationContext.xml"})/*启动Spring容器*/
public class MailSenderTest {

    @Autowired
    @Qualifier("mailSender")
    private MailSender mailSender;

    @Test
    public void testSetApplicationContext() throws Exception {

    }

    @Test
    public void testSendMail() throws Exception {
        mailSender.sendMail("nbzlnzlq@126.com");
    }
}

D:\GitHub\tools\JavaEEDevelop\Lesson17_JavaWebDemo\test\org\zln\module_chapter2\event\MailSenderTest.java