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