快速入門
在spring中只要實(shí)現(xiàn) ApplicationListener 接口 實(shí)現(xiàn) onApplicationEvent 方法。即可完成監(jiān)聽事件， 在event方法中 因?yàn)槭潜O(jiān)聽所有方法 ，在ioc容器中默認(rèn)會(huì)初始化監(jiān)聽器 外加5個(gè)本省具有的方法：下面代碼演示 幾個(gè)常用的系統(tǒng)默認(rèn)的方法，如果要實(shí)現(xiàn)自定義事件類監(jiān)聽，那么 instanof 判定即可 后面的動(dòng)物類演示一個(gè)自定義的事件
總結(jié)步驟：

1. 實(shí)現(xiàn)ApplicationListener<ApplicationEvent> 并且對(duì)需要事件監(jiān)聽
2. 實(shí)現(xiàn)ApplicationContextAware 并發(fā)布 事件
   3.構(gòu)建事件類
   4.配置xml

同理要使用，還要配置 bean

       <!-- 監(jiān)聽器 -->
    <bean id="mylistener" class="listener.myListener"></bean>

package listener;

import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextClosedEvent;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.context.event.ContextStartedEvent;

public class myListener implements ApplicationListener<ApplicationEvent>{

    @Override
    public void onApplicationEvent(ApplicationEvent event) {
        if (event instanceof ContextStartedEvent) {
             System.out.println("開始執(zhí)行");
        } else if (event instanceof ContextClosedEvent) {
            System.out.println("結(jié)束執(zhí)行");
        }else if (event instanceof ContextRefreshedEvent) {
            System.out.println("刷新事件");
        }       
    }

}

、。- 動(dòng)物類

package entiy;

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

public class Animal implements ApplicationContextAware{
    
    private ApplicationContext ac;

    public void speak(){
        //必須通過ApplicationContext發(fā)布事件
        ac.publishEvent(new AnimalSpeakEvent(ac));
    }

    @Override
    public void setApplicationContext(ApplicationContext arg0)
            throws BeansException {
          this.ac = arg0;       
    }
}

package entiy;

import org.springframework.context.ApplicationEvent;

public class AnimalSpeakEvent extends ApplicationEvent {


    public String getAnimalEvent(){
        return "動(dòng)物事情";
    }
    
    
    public AnimalSpeakEvent(Object source) {
        super(source);
    }
    
    /**
     * 
     */
    private static final long serialVersionUID = 1L;

}

xml 中配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd">
        <!-- 監(jiān)聽器 -->
    <bean id="mylistener" class="listener.myListener"></bean>
    <bean id="Animal" class="entiy.Animal"></bean>
    <bean id="jdk" class="services.servicesimpl" autowire="byName"> <property name="idao" ref="IDaoImpl"></property></bean>
    <bean id="IDaoImpl" class="basedao.impl.IDaoImpl"></bean>
</beans>

只要在容器中 調(diào)用了這個(gè)方法，就會(huì)觸發(fā)監(jiān)聽器

        Animal animal = (Animal) context.getBean("Animal");
        animal.speak();