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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