mybeanfactory.java

出学者的基础,你可以用它来开始你学习AJAX的旅程.很简单的.

package demo;

import java.util.*;
import java.io.*;
import java.lang.reflect.*;

public class MyBeanFactory{
	private static MyBeanFactory instance = null;

	private MyBeanFactory(){}

	public static MyBeanFactory getInstance(){
		if(instance == null){
			instance = new MyBeanFactory();
		}
		return instance;
	}
	
	//根据用户传入的ID创建对应的实例并返回
	public Object getBean(String id){
		try{
			//读取配置文件
			InputStream is = getClass().getResourceAsStream("/beans.properties");
			Properties pro = new Properties();
			//把属性文件内容载入到Properties，由Properties对其
			//进行解析，我们就可以直接从Properties类里边根据id
			//对到对应的值了，如pro.getProperty(id)得到类名
			pro.load(is);
			String className = pro.getProperty(id);
			Class cls = Class.forName(className);
			return cls.newInstance();
		}catch(Exception e){
			e.printStackTrace();
			return null;
		}
	}
}