Spring教程28篇：Spring 中的自定义事件

Spring 中的自定义事件

编写和发布自己的自定义事件有许多步骤。按照在这一章给出的说明来编写，发布和处理自定义 Spring 事件。

这个是 CustomEvent.java 文件的内容：

  package com.tutorialspoint;
    import org.springframework.context.ApplicationEvent;
    public class CustomEvent extends ApplicationEvent{ 
       public CustomEvent(Object source) {
          super(source);
       }
       public String toString(){
          return "My Custom Event";
       }
    }

下面是 CustomEventPublisher.java 文件的内容：

  package com.tutorialspoint;
    import org.springframework.context.ApplicationEventPublisher;
    import org.springframework.context.ApplicationEventPublisherAware;
    public class CustomEventPublisher 
       implements ApplicationEventPublisherAware {
       private ApplicationEventPublisher publisher;
       public void setApplicationEventPublisher
                  (ApplicationEventPublisher publisher){
          this.publisher = publisher;
       }
       public void publish() {
          CustomEvent ce = new CustomEvent(this);
          publisher.publishEvent(ce);
       }
    }

下面是 CustomEventHandler.java 文件的内容：

  package com.tutorialspoint;
    import org.springframework.context.ApplicationListener;
    public class CustomEventHandler 
       implements ApplicationListener<CustomEvent>{
       public void onApplicationEvent(CustomEvent event) {
          System.out.println(event.toString());
       }
    }

下面是 MainApp.java 文件的内容：

  package com.tutorialspoint;
    import org.springframework.context.ConfigurableApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    public class MainApp {
       public static void main(String[] args) {
          ConfigurableApplicationContext context = 
          new ClassPathXmlApplicationContext("Beans.xml");    
          CustomEventPublisher cvp = 
          (CustomEventPublisher) context.getBean("customEventPublisher");
          cvp.publish();  
          cvp.publish();
       }
    }

下面是配置文件 Beans.xml：

  <?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-3.0.xsd">

       <bean id="customEventHandler" 
          class="com.tutorialspoint.CustomEventHandler"/>

       <bean id="customEventPublisher" 
          class="com.tutorialspoint.CustomEventPublisher"/>

    </beans>

一旦你完成了创建源和 bean 的配置文件后，我们就可以运行该应用程序。如果你的应用程序一切都正常，将输出以下信息：

  My Custom Event
    My Custom Event

作者：陈

来源：https://www.w3cschool.cn/wkspring/7jho1ict.html