JDBC连接oracle 10g express Edition 的时候报错error while performing database login with ** driver

用JDBC连接oracle 10g express Edition 的时候报错error while performing database login with (driver name ) driver ，那位大侠指点下可能出现的情况！谢了哦！

package dao;import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;public class DBFactory { protected static Connection getconnection(){    Connection conn = null;  try {   Class.forName("oracle.jdbc.driver.oracledriver");      conn = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:xe");   } catch (SQLException e) {    // TODO Auto-generated catch block    e.printStackTrace();   }   catch (ClassNotFoundException e) {   // TODO Auto-generated catch block   e.printStackTrace();  }  return conn; }这就是连接代码，jar包是自带的classes12 ，服务全部已启动状态

你的连接错着呢如下：把这个（127.0.0.1）换成你的IP地址 如 192.168.1.56