有没有人帮看看啊，连接数据库报错

package com.oracle.conn;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class acc {

public static void main(String[] args) throws ClassNotFoundException,SQLException{
    // TODO Auto-generated method stub
    Class.forName("oracle.jdbc.driver.OracleDriver");
    
    String url="jdbc:oracle:thin:@localhost:1521:xe";
    String user="Tan";
    String password="123456";
    Connection conn = DriverManager.getConnection(url, user, password);
    System.out.println(conn);
}

}

空指针异常了呀，应该是jdbc连接数据库失败导致的吧，看下15行哪里为空了
看下 driverName 跟oracle版本，jar包是否对应 oracle9之后是使用下边的
driverName = "oracle.jdbc.OracleDriver";
这是我这边写的一个测试jdbc的你可以试下 jar是 ojdbc6-11.2.0.4.0.jar

public class JdbcUtil {
     private static String url = "jdbc:oracle:thin:@10.10.10.101:1521:test";
        private static String userName = "test";
        private static String pwd = "test";
        private static String driverName = "oracle.jdbc.OracleDriver";

    static {
        try {
            Class.forName(driverName);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws SQLException {
        Connection connection = null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        String sql = "  select  b.usercode usercode from loginUser b where b.usercode= ? and b.password=?";

        try {
            connection = DriverManager.getConnection(url, userName, pwd);
        } catch (SQLException e1) {
            e1.printStackTrace();
        }

        try {
            ps = connection.prepareStatement(sql);
            ps.setString(1, "111111");
            ps.setString(2, "123456");
            rs = ps.executeQuery();
            while (rs.next()) {
                String usercode = rs.getString("usercode");
                System.out.println("登录用户为:" + usercode);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (rs != null) {
                rs.close();
            }

            if (ps != null) {
                ps.close();
            }

            if (connection != null) {
                connection.close();
            }
        }
    }
}