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");
}
}
}