jsp中调用类的方法，总是报错，数据库连接一切正常，用main方法调用类的方法就没问题~~~~！！

Question

package com.PIM.dao;public class UserDao {    public boolean exsit(String name) throws SQLException { Connection conn=DBUtil.getConnection(); String sql="" + " select * from imooc_goddess " + " where user_name=? "; PreparedStatement ptmt=conn.prepareStatement(sql); ptmt.setString(1, name); ResultSet rs=ptmt.executeQuery(); if(rs!=null){ return true; } else{ return false; }}jsp 页面：<%@ page language="java" import="java.util.* ,com.PIM.dao.*,com.PIM.model.*" contentType ="text/html; charset=utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; String password = null; request.setCharacterEncoding("utf-8"); //只是针对POST方式提交的请求，对GET方式无效。 response.setContentType("text/html;charset=utf-8"); UserDao ud= new UserDao();//报错的地方~~~~~~~~~~~~~~~！！！！！！！！~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ boolean a = ud.exsit("565203087");//写死，数据库中有这条数据。但是调用总是报错。 if(a){ request.getRequestDispatcher("main.jsp").forward(request,response);//服务器内部转发 } else{ response.sendRedirect("Registion.jsp");//请求重定向 }%>main 方法：UserDao ud = new UserDao();boolean a = ud.exsit("565203087"); System.out.println(a);//一切正常，服务台能返回true    

Answer 1

把报错内容贴出来瞅瞅。