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; 
    } 
}