JDBC DAOFActory 클래스 구현

package ajax.user.language.factory.dao_factory; import java.io.File; import java.io.FileInputStream; import java.io.InputStream; import java.util.Properties; /** *          JDBC   ：                       （      ） *                dao     (       ); *     ：（1）    DAO         （  Object        ） * （2）                。 * （3）    dao     ，       JDBC hibernate      ，                * @author kevin Email:[email protected] * 2010-01-09 */ public class DaoFactory { /**      */ private static DaoFactory daoFactory=null; /**dao      */ private static Object daoImpl=null; /**  new  */ private DaoFactory(){} /**      */ public static DaoFactory getDaoFactoryInstance(){ if(daoFactory==null){ synchronized(DaoFactory .class){ if(daoFactory==null){//        ，                       daoFactory=new DaoFactory(); } } } return daoFactory; } /** *     properties     dao      * properti    :userDao=ajax.user.language.entity.User（      ）; *          Object  ，                    。 * @param key userDao * @param filePath properties     * @return Object   */ public Object produceDaoImpObject(String key,String filePath){ try { Properties prop=new Properties(); InputStream input=new FileInputStream(new File(filePath)); prop.load(input); String daoClass=prop.getProperty(key); daoImpl=Class.forName(daoClass).newInstance(); } catch (Exception e) { throw new ExceptionInInitializerError(); } return daoImpl; } /** *          src         * @param key * @return Object   */ public Object produceDaoImpObjectOverFileName(String key,String FileName){ try { Properties prop=new Properties(); InputStream input=DaoFactory.class.getClassLoader().getResourceAsStream(FileName); prop.load(input); String daoClass=prop.getProperty(key); System.out.println(daoClass); daoImpl=Class.forName(daoClass).newInstance(); } catch (Exception e) { e.printStackTrace(); throw new ExceptionInInitializerError(); } return daoImpl; } } 

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package ajax.user.language.dao.impl; import ajax.user.language.entity.Student; import ajax.user.language.factory.dao_factory.DaoFactory; public class Test { public static void main(String[] args) { DaoFactory daoFactory=DaoFactory.getDaoFactoryInstance(); //StuDaoImpl stuImpl=(StuDaoImpl)daoFactory.produceDaoImpObjectOverFileName("StudentDaoImpl","daoconfig.properties"); //StuDaoImpl stuImpl=(StuDaoImpl)daoFactory.produceDaoImpObject("StudentDaoImpl","D://newapps//workspace//ajax//src//daoconfig.properties"); StuDaoImpl stuImpl=(StuDaoImpl)daoFactory.produceDaoImpObject("StudentDaoImpl","src/daoconfig.properties"); Student s1=new Student(); s1.setId("stu1"); s1.setName("zhangsan"); s1.setSex("F"); try { stuImpl.addStudent(s1); } catch (Exception e) { e.printStackTrace(); } } }