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【Spring】Spring常用配置-事件(Application Event)
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‎springBoot/.idea/workspace.xml‎

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‎springBoot/src/main/java/cn/hncu/p2_5_2ApplicationEvent/DemoListener.java‎

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@@ -16,6 +16,5 @@ public class DemoListener implements ApplicationListener<DemoEvent> {//实现App
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public void onApplicationEvent(DemoEvent demoEvent) {//使用onApplicationEvent方法对消息进行接受处理
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String msg = demoEvent.getMsg();
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System.out.println(this.getClass()+"监听到了bean-demoPublisher发布的消息:"+msg);
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//监听到之后可以做其他事
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}
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}

‎springBoot/src/main/java/cn/hncu/p2_5_2ApplicationEvent/DemoPublisher.java‎

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ApplicationContext applicationContext;//注入ApplicationContext用来发布事件
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public void publish(String msg){
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applicationContext.publishEvent(new DemoEvent(this,msg));
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DemoEvent demoEvent = new DemoEvent(this,msg);
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applicationContext.publishEvent(demoEvent);//在这里的时候,会去运行DemoListener中的onApplicationEvent方法
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System.out.println("消息:"+demoEvent.getMsg());
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//使用ApplicationContext的publishEvent方法来发布
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}
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#分析
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Spring的事件(Application Event)为Bean与Bean之间的消息通信提供了支持。
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当一个Bean处理完一个任务之后,希望另一个Bean知道并能做出相应的处理,这时我们就需要让另外一个Bean监听当前Bean所发送的事件。
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Spring的事件需要遵循如下流程:
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1、自定义事件,集成ApplicationEvent。
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2、定义事件监听器,实现ApplicationListener
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3、使用容器发布容器
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进行本示例的演示,需要先配置好Maven和Spring哦、
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见:
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<a href="http://blog.csdn.net/qq_26525215/article/details/53010442" target='_blank'>【Spring】基于IntelliJ IDEA搭建Maven</a>
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下面直接上示例吧。
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#示例
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##自定义事件
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```
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package cn.hncu.p2_5_2ApplicationEvent;
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import org.springframework.context.ApplicationEvent;
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/**
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* Created with IntelliJ IDEA.
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* User: 陈浩翔.
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* Date: 2016年11月15日.
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* Time: 下午 8:39.
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* Explain:自定义事件
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*/
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public class DemoEvent extends ApplicationEvent{
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private static final long serialVersionUID = 1L;
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private String msg;
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public DemoEvent(Object source,String msg) {
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super(source);
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this.msg=msg;
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System.out.println(this.getClass()+",构造方法");
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}
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public String getMsg() {
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return msg;
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}
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public void setMsg(String msg) {
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this.msg = msg;
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}
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}
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```
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##事件监听器
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```
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package cn.hncu.p2_5_2ApplicationEvent;
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import org.springframework.context.ApplicationListener;
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import org.springframework.stereotype.Component;
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/**
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* Created with IntelliJ IDEA.
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* User: 陈浩翔.
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* Date: 2016年11月15日.
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* Time: 下午 8:50.
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* Explain:事件监听器
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*/
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@Component
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public class DemoListener implements ApplicationListener<DemoEvent> {//实现ApplicationListener接口,并指定监听的事件类型
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@Override
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public void onApplicationEvent(DemoEvent demoEvent) {//使用onApplicationEvent方法对消息进行接受处理
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String msg = demoEvent.getMsg();
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System.out.println(this.getClass()+"监听到了bean-demoPublisher发布的消息:"+msg);
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}
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}
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```
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##事件发布类
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```
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package cn.hncu.p2_5_2ApplicationEvent;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.context.ApplicationContext;
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import org.springframework.stereotype.Component;
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/**
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* Created with IntelliJ IDEA.
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* User: 陈浩翔.
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* Date: 2016年11月15日.
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* Time: 下午 10:39.
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* Explain:事件发布类
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*/
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@Component
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public class DemoPublisher {
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@Autowired
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ApplicationContext applicationContext;//注入ApplicationContext用来发布事件
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public void publish(String msg){
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DemoEvent demoEvent = new DemoEvent(this,msg);
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applicationContext.publishEvent(demoEvent);//在这里的时候,会去运行DemoListener中的onApplicationEvent方法
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System.out.println("消息:"+demoEvent.getMsg());
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//使用ApplicationContext的publishEvent方法来发布
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}
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}
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```
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##配置类
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```
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package cn.hncu.p2_5_2ApplicationEvent;
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import org.springframework.context.annotation.ComponentScan;
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import org.springframework.context.annotation.Configuration;
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/**
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* Created with IntelliJ IDEA.
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* User: 陈浩翔.
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* Date: 2016年11月15日.
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* Time: 下午 10:46.
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* Explain:配置类
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*/
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@Configuration
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@ComponentScan("cn.hncu.p2_5_2ApplicationEvent")
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public class EventConfig {
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}
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```
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##运行类
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```
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package cn.hncu.p2_5_2ApplicationEvent;
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import org.springframework.context.annotation.AnnotationConfigApplicationContext;
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/**
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* Created with IntelliJ IDEA.
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* User: 陈浩翔.
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* Date: 2016年11月15日.
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* Time: 下午 10:47.
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* Explain:运行类
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*/
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public class Main {
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public static void main(String[] args) {
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AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(EventConfig.class);
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DemoPublisher demoPublisher = context.getBean(DemoPublisher.class);
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demoPublisher.publish("hello 你好...");
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context.close();
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}
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}
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```
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#运行结果
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![](http://img.blog.csdn.net/20161115232149376)
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