Codeless的部落格

BeanPostProcessor可以針對初始化前後做一些修正(如:初始化前顯示為小寫,修正後為大寫等)

HelloWorld.java

package com.example ;

public class HelloWorld {
private String message ;
public void init(){
System.out.println("Initialization now") ;
}
public void getMessage(){
 System.out.println("Your Message : " + message);
}
public void setMessage(String message) {
this.message = message;
}
public void destroy(){
System.out.println("Destory now") ;
}
}

Main.java

package com.example ;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {

public static void main(String[] args) {
AbstractApplicationContext context = 
 new ClassPathXmlApplicationContext("Beans.xml");
 HelloWorld obj = (HelloWorld) context.getBean("helloWorld");
 obj.getMessage();
 context.registerShutdownHook();
}
}

PostHelloWorld.java

package com.example ;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;

public class PostHelloWorld implements BeanPostProcessor{
@Override
public Object postProcessAfterInitialization(Object bean, String name)
throws BeansException {
System.out.println("After Destory...");
return bean;
}
@Override
public Object postProcessBeforeInitialization(Object bean, String name)
throws BeansException {
System.out.println("Before Initialization...") ;
return bean;
}
}

Beans.xml

結果顯示如下所示:

Before Initialization...
Initialization now
After Destory...
Your Message : Hello World!
Destory now

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