Oracle数据库访问错误

    又遇到问题了，Java连接Oracle时出错，大家帮忙看看哈，谢谢哈。
    配置文件连接语句代码如下：
DBType=3

OracleDriver=oracle.jdbc.driver.OracleDriver
OracleURL=jdbc:oracle:thin:@localhost:1521:XE
datasource.username=system
datasource.password=yaoyao123456


    Java类中读取数据代码如下：
package dataConn;
import java.io.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.servlet.*;
import javax.servlet.http.*;

public class GetData extends HttpServlet {
   
DBConnection DBConn = new DBConnection();
    public ResultSet rs =null;
    public Connection con=null;
    public Statement st=null;
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException{

        response.setContentType("text/xml;charset=utf-8");
        response.setHeader("Cache-Control", "no-cache");
        String content = "";
        String name="";