JavaReflect

package com.daoFactory; import java.io.FileInputStream; import java.util.Properties; import com.baseDao.DAOInterface; /** * 最简单的java反射技术 * Creation date 2008-11-6 * @author huangshangwen * */ public class DAOFactory { /** * 私有静态对象,加载时候不做初始化 */ private static DAOFactory instance; private static DAOInterface daoInterface = null; private static Properties pro = null; /** * 静态工厂方法,返回此类的唯一实例. * 当发现实例没有初始化的时候才初始化. * 同步(synchronized) * @return */ public static synchronized DAOFactory getInstance(){ if(instance==null){ instance = new DAOFactory(); } return instance; } /** * className.properties文件中 * 利用"键值对"指定了具体dao的全路径 * @param key * @return */ public DAOInterface getDAOInterface(String key){ pro = new Properties(); try { //注意文件的相对路径.. pro.load(new FileInputStream("../JavaReflect/className.properties")); daoInterface = (DAOInterface) Class.forName(pro.getProperty(key)).newInstance(); } catch (Exception e) { return null; } return daoInterface; } }