Spring 事件监听

快速入门
在spring中只要实现 ApplicationListener 接口实现 onApplicationEvent 方法。即可完成监听事件，在event方法中因为是监听所有方法，在ioc容器中默认会初始化监听器外加5个本省具有的方法：下面代码演示几个常用的系统默认的方法，如果要实现自定义事件类监听，那么 instanof 判定即可后面的动物类演示一个自定义的事件
总结步骤：

实现ApplicationListener<ApplicationEvent> 并且对需要事件监听
实现ApplicationContextAware 并发布事件
3.构建事件类
4.配置xml

同理要使用，还要配置 bean

       <!-- 监听器 -->
    <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("开始执行");
        } else if (event instanceof ContextClosedEvent) {
            System.out.println("结束执行");
        }else if (event instanceof ContextRefreshedEvent) {
            System.out.println("刷新事件");
        }       
    }

}

、。- 动物类

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(){
        //必须通过ApplicationContext发布事件
        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 "动物事情";
    }
    
    
    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">
        <!-- 监听器 -->
    <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>

只要在容器中调用了这个方法，就会触发监听器

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

Spring 事件监听

xml 中配置

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