jsp 传值 post得不到值，get可以，为什么
小弟写了个登陆界面，页面提交给servlet，提交方法用post得不到值，用get却可以。可是不能用get啊，不然密码地址栏里都出来了
登陆jsp如下：
- HTML code
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><html> <head> <title>网站信息管理系统</title> <link href="home/home.css" rel="stylesheet" type="text/css" /> </head> <body> <Script>if(self!=top){top.location=self.location;}</script> <script language="javascript"> function checklogin() { if (document.login.name.value == '') { alert('请输入帐户'); document.login.username.focus(); return false } if (document.login.password.value == '') { alert('请输入密码'); document.login.password.focus(); return false } if (document.login.yzm.value == '') { alert('请输入验证码'); document.login.yzm.focus(); return false } } </script> <div class="b_w"> <div class="l_t"> <div class="left l_title"> 网站管理系统 </div> <div class="right"> <a href="../"> <img src="home/icon_back.gif" alt="返回" hspace="4" vspace="8" border="0" /> </a> <a href="javascript:window.close()"><img src="home/icon_close.gif" alt="关闭" hspace="4" vspace="8" border="0" /> </a> </div> </div> <div class="l_bg"> <form action="/SixMen/Employee" name="login" method="post" onSubmit="return checklogin();"> <ul class="l_user"> <li> 帐户： <input name="name" size="14" type="text" class="l_input" /> </li> <li> 密码： <input name="password" size="14" type="password" class="l_input" /> </li> <li> 验证： <input name="yzm" id="yzm" size="3" type="text" class="l_input" /> <img id=img src="home/img.jsp" alt="图片看不清？点击刷新" onclick="img.src='home/img.jsp?'+new Date().getTime()";> </li> <li> <input class="l_bnt" value="登 录" type="submit" /> <input class="l_bnt" value="重 写" type="reset" /> </li> </ul> </form> </div> <div class="l_f"> <div class="left"> <img src="home/f_l.gif" /> </div> <div class="left"> <img src="home/f_bg.gif" width="378" height="36" /> </div> <div class="right"> <img src="home/f_r.gif" /> </div> </div> </div> </body></html>
servlet代码如下：
- Java code
package com.SixMen.Servlet.Employee;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import com.SixMen.Dao.Employee.EmployeeDao;import com.SixMen.Impl.Employee.EmployeeImpl;public class EmployeeLoginServlet extends HttpServlet { /** * */ private static final long serialVersionUID = 1993790530757753459L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpSession session = request.getSession(); String ses=(String)session.getAttribute("code");//获取验证码 System.out.println(ses);////////////////////// String yzm=request.getParameter("yzm");//获取用户输入的验证码 System.out.println(yzm);////////////////////// String name = request.getParameter("name"); System.out.println(name);////////////////////// String pasw=request.getParameter("password");//获取用户名和密码 if(request.getAttribute("employeename")!=null){ request.getRequestDispatcher("Employee/alreadylogin.jsp").forward(request, response);//已经登录 }else if(name!=null){ System.out.println("开始登陆1"); if(ses.equals(yzm)){//验证码一致 EmployeeDao user=new EmployeeImpl(); if(user.CheckUser(name, pasw)){//判断用户登录信息 session.setAttribute("employeename", name);//将用户姓名记入session session.setAttribute("dutyID", user.getUserdutyID(name));//将用户的岗位id记入session session.setAttribute("depname", user.getUserDepname(name));//将用户的部门name记入session request.getRequestDispatcher("/Employee/Storeroom").forward(request, response);//登陆成功 }else{ request.getRequestDispatcher("/Employee/").forward(request, response);//登录失败 } }else{ request.getRequestDispatcher("/Employee/").forward(request, response);//登录失败 } }else{ System.out.println(name); System.out.println("开始登陆2"); request.getRequestDispatcher("/Employee/login.jsp").forward(request, response); } }}[解决办法]
request.getAttribute("yzm"); 改成这样 用POST 试试看
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你先把图片验证去掉试试看！ 看能不能执行post方法！
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页面问题排查方法：
删除页面非关键内容，先保证主要功能可用，再添加其他的。
你的js,验证码，div，都是额外的。
尝试只保留form和必须的input。
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[解决办法]
post请求的时候，form提交的按钮太多，所以会出现这个错误，建议如楼上说的一样，把验证放到别的jsp中用<jsp:include page="验证的jsp页面"> 试试！