急！！jsp+servlet+javabean 制作登录页面问题

为什么我在登录页面输入完名称密码后调到的空白页面，真心求指导！
这个是我登录页面的代码
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>登录</title>
</head>
<body>
<center><br><br><br>
<p><form action="<%=request.getContextPath ()%>/CheckServlet" method="post">
<table width="259" border="1" cellpadding="0" cellspacing="0" bordercolor="#0099FF">
<tr align="center">
    <td height="20" colspan="2"><span class="style1">登陆</span></td>
</tr>
<tr>
    <td width="50" height="20">用户名</td>
    <td width="161" align="left"><input name="uname" type="text" id="uname" size="19"></td>
</tr>
<tr>
    <td height="20">密码</td>
    <td align="left"><input name="pword" type="password" id="pword" size="20"></td>
</tr>
<tr align="center">
    <td colspan="2"><input type="submit" name="Submit" value="提交">  
      <input type="reset" name="Submit" value="重置"></td>
</tr>
</table>
</form>
<p>
</center>
</body>
</html>
这个是我com.ceun包下的CheckServlet代码
package com.ceun;import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import com.ceun.bean.UserBean;
/** */
/**
*
* @author ceun
* @version
*/
public class CheckServlet extends HttpServlet{

    /**
*
*/
private static final long serialVersionUID = 1L; /** *//** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String uname=request.getParameter("uname");
        String pword=request.getParameter("pword");
        out.println("<br><br><br><hr><center><font color=red size=12><B>");
        try{
        UserBean user=new UserBean();
        if(user.check(uname,pword))
            out.println("登陆成功");
        else
            out.println("登陆失败");
        }catch(Exception e){

        }
        out.println("</B></font></center>");
        out.close();
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** *//** Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** *//** Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** *//** Returns a short description of the Servlet.
     */
    public String getServletInfo() {
        return "Short description";
    }
    // </editor-fold>
}
这个是com.ceun.bean包下的UserBean代码package com.ceun.bean;
import java.sql.*;
import com.ceun.util.DbUtil;
public class UserBean {

    /**//** Creates a new instance of UserBean */
    public UserBean() {
    }
    public boolean check(String uname,String pword)
      throws Exception{
    Connection con= DbUtil.connectToDb();
    Statement stmt=null;
      try{
            String sql="SELECT * FROM loginInfo "+
         " WHERE uname='"+uname+"' and pword='"+pword+"'";
              stmt=con.createStatement();

              ResultSet rs=stmt.executeQuery(sql);
              if(rs.next()) return true;
        }
      catch(Exception ex)
      {

      }finally{
        try{
          stmt.close();
          con.close();
        }catch(Exception e){e.printStackTrace();}
      }
     return false;
}

}
这个是com.ceun.util包下的DbUtil代码package com.ceun.util;import java.sql.*;/**//**
* <strong>DbUtil</strong> is a utility class to create
* a connection to our sample database.
*/
public class DbUtil {
    static String driverName="sun.jdbc.odbc.JdbcOdbcDriver";
    static String dbUrl="jdbc:odbc:huoche";public DbUtil() {}public static java.sql.Connection connectToDb(String databaseName)throws Exception
{
        Connection connection=null;
        String connName = dbUrl+databaseName;
        Class.forName(driverName).newInstance();
        connection = DriverManager.getConnection(connName);
        return connection;
}public static java.sql.Connection connectToDb()throws Exception{
    return (connectToDb("logInfo"));
}
}

解决方案 »

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为什么我在login.jsp页面不管输入什么，都是跳转到一个空白的页面。真心求指导~
有没有跳到servlet?
你可以debug或者在println验证一下。
跳转到CheckServlet页面了，但是页面里除了一条横线什么都没有。
这个是web.xml代码<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>
jht</display-name>
<servlet>
<description>
</description>
<display-name>
j</display-name>
<servlet-name>j</servlet-name>
<servlet-class>
j</servlet-class>
</servlet>
<servlet>
<description>
</description>
<display-name>
h</display-name>
<servlet-name>h</servlet-name>
<servlet-class>
h</servlet-class>
</servlet>
<servlet>
<description>
</description>
<display-name>
a</display-name>
<servlet-name>a</servlet-name>
<servlet-class>
com.ceun.a</servlet-class>
</servlet>
<servlet>
<description>
</description>
<display-name>
CheckServlet</display-name>
<servlet-name>CheckServlet</servlet-name>
<servlet-class>
com.ceun.CheckServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>j</servlet-name>
<url-pattern>/j</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>h</servlet-name>
<url-pattern>/h</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>a</servlet-name>
<url-pattern>/a</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CheckServlet</servlet-name>
<url-pattern>/CheckServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
很有可能抛异常了
try{
        UserBean user=new UserBean();
        if(user.check(uname,pword))
            out.println("登陆成功");
        else
            out.println("登陆失败");
        }catch(Exception e){

        }
上面的代码如果抛异常的话在页面上什么也显示不出来
如果代码抛异常了，执行到下面红色的部分呢，不是什么都没打印出来吗try{
        UserBean user=new UserBean();
        if(user.check(uname,pword))
            out.println("登陆成功");
        else
            out.println("登陆失败");
        }catch(Exception e){

        }
如果代码抛异常了，执行到下面红色的部分呢，不是什么都没打印出来吗
try{
        UserBean user=new UserBean();
        if(user.check(uname,pword))
            out.println("登陆成功");
        else
            out.println("登陆失败");
        }catch(Exception e){

        }
catch(Exception e){
           out.println(e);
        }
再试试，看看是不是还是什么都没有
我加入了out.println(e);然后显示的是java.sql.SQLException: [Microsoft][ODBC 驱动程序管理器] 未发现数据源名称并且未指定默认驱动程序
缺少数据源，首先，创建一个数据源在你电脑的控制面板-管理工具-数据源里面创建
缺少了驱动，连接SqlServer之类的数据库都有与之对应的驱动
用的是sql 桥连在开始运行中输入odbcad32 配置一个数据源 DatebaseDesign
配置系统dsn 点添加下拉菜单有个sqlserver 确定后  配完测试一下
我用的是access数据库，应该怎么操作呢？
lz 你+我QQ把，我帮你盖，这样看得我纠结 . 543452810