关于封装jdbc

public class DBConnection { /** * @param args */ public static Connection getConnection() { /** * 用户无需了解底层是如何实现的,它也不需要关心使用的是哪种数据库 */ IDBConnection service = DBConnectionFactory.getInstance(); Connection conn = service.getConnection(); return conn; } public static void closeConnection(Connection conn) { IDBConnection service = DBConnectionFactory.getInstance(); service.closeConnection(conn); } } 下面这个就是我的工厂了 DBConnectionFactory.java package org.cdy.www.factory; import org.cdy.www.service.IDBConnection; public class DBConnectionFactory { private static IDBConnection instance; //同步锁 private static Object initLock = new Object(); public static IDBConnection getInstance() { if (instance == null) { synchronized (initLock) { try { try { instance = (IDBConnection) Class.forName( DBConnectionConfig.className).newInstance(); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (InstantiationException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } return instance; } }