访问量和要修改的值都为null啊

package RS;

import java.util.HashMap;
import java.util.Map;

public class BDUtil {

   public static Map<String, User> map = new HashMap<String, User>();
   static {
       map.put("101", new User("101","AA","123456","AA@qq.com"));
       map.put("102", new User("102","BB","123456","BB@qq.com"));
       map.put("103", new User("103","CC","123456","CC@qq.com"));
       map.put("104", new User("104","DD","123456","DD@qq.com"));
   }

   //判断用户名密码是否正确
   public static boolean PD(User user) {
       boolean flag = false;
       for (String key : map.keySet()) {
           User u = map.get(key);
           if (user.getAccount().equals(u.getAccount()) && user.getPassword().equals(u.getPassword())) {
               flag = true;
           }
       }
       return flag;
   }
}
<%@ 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>
<title>Insert title here</title>
</head>
<body>
   <%
   //request.setAttribute("name", "imooc");
   //request.getRequestDispatcher("result.jsp").forward(request, response);

   %>
   <h3>人事管理登陆页面</h3>
   
   <hr>
   <form action="control.jsp">
   <table>
       <tr>
           <td>
               账号：<input type="text" name="account"><br>
           </td>
       </tr>
       <tr>
           <td>
               密码：<input type="password" name="password"><br>
           </td>
       </tr>
       <tr>
           <td>
               <input type="submit" value="提交"><br>
           </td>
       </tr>
   </table>
   </form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@page import="RS.*" %>
<%@page import="java.util.Map" %>
<%@page import="java.util.HashMap" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta>
<title>Insert title here</title>
</head>
<body>

   <%
       String aaa = request.getMethod();
       String account = request.getParameter("account");
       String password = request.getParameter("password");
       User user = new User(account,null,password,null);
       boolean flag = BDUtil.PD(user);
       Map<String,User> map = BDUtil.map;
       session.setAttribute("account", account);
       if(flag == true){
           Object o = application.getAttribute("count");
           if(o == null){
               application.setAttribute("conut", 1);
           }else{
               int count = Integer.parseInt(o.toString());
               application.setAttribute("count", count + 1);
           }
   %>
   <%=aaa %>

       <h3>人事管理页面</h3>
       <h4>登陆账号为：<%=session.getAttribute("account") %></h4>
       <h4>访问量：<%=application.getAttribute("count") %></h4>
       <table border="1">
           <tr>
               <td>
                   账号
               </td>
               <td>
                   姓名
               </td>
               <td>
                   邮箱
               </td>
               <td>
                   修改
               </td>
           </tr>

           <%
               for(String key : map.keySet()){
                   User u = map.get(key);
           %>


                   <tr>
                       <td>
                           <%=
                               u.getAccount()
                           %>
                       </td>
                       <td>
                           <%=
                               u.getName()
                           %>
                       </td>
                       <td>
                           <%=
                               u.getEmail()
                           %>
                       </td>
                       <td>
                           <a href="update.jsp?account=<%=u.getAccount()%>
                                               name=<%=u.getName()%>
                                               email=<%=u.getEmail()%>">修改</a>
                       </td>
                   </tr>

           <%

               }
           %>
           </table>
   <%
       }else{
           out.print("用户密码不正确");
       }
   %>
</body>
</html>

慕侠0164612 2018-04-03

源自：JSP内置对象 4-7 信息修改功能

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1回答

一叶知秋519 回答被采纳获得+3积分 2018-04-03 15:09:36

点击修改的链接传递的参数中间加一个&：<a href="update.jsp?account=<%=u.getAccount()%>&name=<%=u.getName()%>&email=<%=u.getEmail()%>">修改</a>

另外，你在update.jsp中，需要获取到这三项的值，然后写到input框内。

祝学习愉快！

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慕侠0164612 提问者 #1

非常感谢！

2018-04-03 15:15:07
慕侠0164612 提问者 #2

点击修改之后的值获取到了，但是访问量还是一为null？

2018-04-03 15:16:09
一叶知秋519 回复提问者慕侠0164612 #3

application.setAttribute("conut", 1); 将conut改为count; 用到的count的拼写应该都是一致的呀。祝学习愉快！

2018-04-03 15:57:08