今天写的一个工厂工具类

package com.student.tools;



import java.io.IOException;

import java.io.InputStream;

import java.util.Properties;



public class ObjectFactory {

	private static Properties pro=new Properties();

	public static Object getBean(String key){

		InputStream is= ObjectFactory.class.getResourceAsStream("/bean.properties");

		String className=null;

		try {

			pro.clear();

			pro.load(is);

			className=pro.getProperty(key);

			Class<?> clazz= Class.forName(className);

			return clazz.newInstance();

		} catch (IOException e) {

			e.printStackTrace();

			throw new RuntimeException("无法读取配置文件");			

		} catch (ClassNotFoundException e) {

			e.printStackTrace();

			throw new RuntimeException("无法找到类"+className);

		} catch (InstantiationException e) {

			e.printStackTrace();

			throw new RuntimeException("无法实例化"+className);	

		} catch (IllegalAccessException e) {

			e.printStackTrace();

			throw new RuntimeException("无法访问"+className+"的构造函数");

		}

	}

}

 

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