Spring е¼

2022-05-16 15:29

Spring е¼

Ѿ½ Spring ĺ ApplicationContext beans ڡ beans ʱApplicationContext ĳЩ͵¼磬ʱContextStartedEvent ֹͣʱContextStoppedEvent

ͨ ApplicationEvent ApplicationListener ӿṩ ApplicationContext д¼һ bean ʵ ApplicationListenerôÿ ApplicationEvent ApplicationContext ϣǸ bean ᱻ֪ͨ

Spring ṩµı׼¼

	Spring ¼ &
1	ContextRefreshedEventApplicationContext ʼˢʱ¼Ҳ ConfigurableApplicationContext ӿʹ refresh()
2	ContextStartedEventʹ ConfigurableApplicationContext ӿе start() ApplicationContext ʱ¼Եݿ⣬ڽܵ¼κֹͣӦó
3	ContextStoppedEventʹ ConfigurableApplicationContext ӿе stop() ֹͣ ApplicationContext ʱ¼ڽܵ¼ҪĹ
4	ContextClosedEventʹ ConfigurableApplicationContext ӿе close() ر ApplicationContext ʱ¼һѹرյĵĩˣܱˢ»
5	RequestHandledEventһ web-specific ¼ bean HTTP Ѿ

Spring ¼ǵ̵߳ģһ¼ֱҳеĽߵõĸϢý̱̽ˣ¼ʹãӦóʱӦע⡣

¼

Ϊ˼¼һ bean Ӧʵֻһ onApplicationEvent() ApplicationListener ӿڡˣдһ¼δģԼοôִлĳЩ¼

ǡλʹ Eclipse IDEȻĲһ Spring Ӧó


1	һΪ SpringExample ĿڴĿ src ļдһ com.tutorialspoint
2	ʹ Add External JARs ѡ Spring ⣬ͼ Spring Hello World Example ½ڡ
3	com.tutorialspoint д Java HelloWorldCStartEventHandlerCStopEventHandler MainApp
4	src ļд Bean ļ Beans.xml
5	һǴ Java ļ Bean ļݣӦó򣬽ʾ

HelloWorld.java ļݣ

package com.tutorialspoint;
public class HelloWorld {
   private String message;
   public void setMessage(String message){
      this.message  = message;
   }
   public void getMessage(){
      System.out.println("Your Message : " + message);
   }
}

CStartEventHandler.java ļݣ

package com.tutorialspoint;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextStartedEvent;
public class CStartEventHandler 
   implements ApplicationListener<ContextStartedEvent>{
   public void onApplicationEvent(ContextStartedEvent event) {
      System.out.println("ContextStartedEvent Received");
   }
}

CStopEventHandler.java ļݣ

package com.tutorialspoint;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextStoppedEvent;
public class CStopEventHandler 
   implements ApplicationListener<ContextStoppedEvent>{
   public void onApplicationEvent(ContextStoppedEvent event) {
      System.out.println("ContextStoppedEvent Received");
   }
}

MainApp.java ļݣ

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");

      // Let us raise a start event.
      context.start();

      HelloWorld obj = (HelloWorld) context.getBean("helloWorld");

      obj.getMessage();

      // Let us raise a stop event.
      context.stop();
   }
}

ļ Beans.xml ļ

<?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="helloWorld" class="com.tutorialspoint.HelloWorld">
      <property name="message" value="Hello World!"/>
   </bean>

   <bean id="cStartEventHandler" 
         class="com.tutorialspoint.CStartEventHandler"/>

   <bean id="cStopEventHandler" 
         class="com.tutorialspoint.CStopEventHandler"/>

</beans>

һ˴Դ bean ļǾͿиӦóӦóһжϢ

ContextStartedEvent Received
Your Message : Hello World!
ContextStoppedEvent Received

Spring еԶ¼

дͷԼԶ¼ಽ衣һ¸˵дʹԶ Spring ¼


1	һΪ SpringExample ĿڴĿ src ļдһ com.tutorialspoint
2	ʹ Add External JARs ѡ Spring ⣬ͼ Spring Hello World Example ½ڡ
3	ͨչ ApplicationEvent,һ¼ CustomEvent붨һĬϵĹ캯Ӧô ApplicationEvent м̳еĹ캯
4	һ¼࣬Դκзٶ EventClassPublisher ʵ ApplicationEventPublisherAware㻹Ҫ XML ļΪһ bean֮ʶ bean Ϊ¼ߣΪʵ ApplicationEventPublisherAware ӿڡ
5	¼һбٶ EventClassHandler ʵ ApplicationListener ӿڣʵԶ¼ onApplicationEvent
6	src ļд bean ļ Beans.xml MainApp ࣬Ϊһ Spring ӦóС
7	һǴ Java ļ Bean ļݣӦó򣬽ʾ

CustomEvent.java ļݣ

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";
   }
}

CustomEventPublisher.java ļݣ

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);
   }
}

CustomEventHandler.java ļݣ

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

MainApp.java ļݣ

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();
   }
}

ļ 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>

һ˴Դ bean ļǾͿиӦóӦóһжϢ

My Custom Event
My Custom Event

ο

https://www.w3cschool.cn/wkspring https://www.runoob.com/w3cnote/basic-knowledge-summary-of-spring.html http://codepub.cn/2015/06/21/Basic-knowledge-summary-of-Spring https://dunwu.github.io/spring-tutorial https://mszlu.com/java/spring http://c.biancheng.net/spring/aop-module.html