传智博客jdbc学习案例

package cn.itcast.jdbc.dao; import java.io.File; import java.io.FileInputStream; import java.io.InputStream; import java.util.Properties; /** * * 2008-12-6 * * @author <a href="mailto:liyongibm@gmail.com">liyong</a> * */ public class DaoFactory { private static UserDao userDao = null; private static DaoFactory instance = new DaoFactory(); private DaoFactory() { try { Properties prop = new Properties(); InputStream inStream = DaoFactory.class.getClassLoader() .getResourceAsStream("daoconfig.properties"); prop.load(inStream); String userDaoClass = prop.getProperty("userDaoClass"); Class clazz = Class.forName(userDaoClass); userDao = (UserDao) clazz.newInstance(); } catch (Throwable e) { throw new ExceptionInInitializerError(e); } } public static DaoFactory getInstance() { return instance; } public UserDao getUserDao() { return userDao; } }