jsp第八周作业

1.登陆
输入用户名密码，判断用户名和密码相同，登陆成功，session中保存用户的用户名，进入主页main.jsp，主页有一个退出按钮，点击，回到登陆页login.jsp。要求：退出登录后，如果在浏览器直接输入主页main.jsp，访问不了，直接跳到登陆页。

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>login</title>
    
  </head>
  
  <body>
   <form  name="form" action="dologin.jsp" method="post">
      用户名：<input type="text" name="uname"><br>
      密码：<input type="password" name="upwd"><br>
    <input type="submit" value="登录" >    
    </form>
  </body>
</html>

　　dologin,jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>dologin</title>
    
  </head>
  
  <body>
     <%
       request.setCharacterEncoding("utf-8");
       String uname=request.getParameter("uname");
       String upwd=request.getParameter("upwd");
       if(uname.equals(upwd)){
          session.setAttribute("uname", uname);
          request.getRequestDispatcher("main.jsp").forward(request,response);
        }else{
           request.getRequestDispatcher("no.jsp").forward(request,response);
       }
     %>
  </body>
</html>

　　main.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>main</title>
    
  </head>
  
  <body>
    <h1>登陆成功！</h1>

    <%
        String uname = (String) session.getAttribute("uname");
        if (uname == null)
            response.sendRedirect("login.jsp");           
    %>
    
    <form name="form1" action="loout.jsp" method="post">
    <input type="submit" value="退出登录">
    </form>   
   
</body>
</html>

　　no.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>


<title>no</title>

</head>

<body>
    <h1>登陆失败！！</h1>
    <%response.setHeader("refresh", "5;url=login.jsp");%>

</body>
</html>

　　logout.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>logout</title>
    
  </head>
  
  <body>
    <%
    session.invalidate();
    response.setHeader("refresh", "5;url=login.jsp");
     %>
  </body>
</html>

2.购物车
和上一题一起，在main.jsp中做一个购物车，里面显示3个商品名和价格每一个后面有一个加入购物车按钮，main.jsp中有一个按钮（或者超链接）可以显示购物车。（选作：在购物车中加删除按钮删除商品）

main.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>main</title>
    
  </head>
  
  <body>
    <h1>登陆成功！</h1>

    <%
        String uname = (String) session.getAttribute("uname");
        
        if (uname == null)
            response.sendRedirect("login.jsp");
            
    %>
    
    <form action="show.jsp" method="post">
                商品：<br> <br>
                可乐 3.50<input type="checkbox" name="item" value="可乐">加入购物车 <br> 
                瓜子 6.00 <input type="checkbox" name="item" value="瓜子"> 加入购物车 <br> 
                矿泉水  1.00<input type="checkbox" name="item" value="矿泉水"> 加入购物车<br><br>
    <input type="submit" value="加入购物车">
    </form>
   
    <form name="form1" action="logout.jsp" method="post">
    <input type="submit" value="退出登录">
    </form>
 
</body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>show</title>
    
  </head>
  
  <body>
    <%
       request.setCharacterEncoding("utf-8");
       String itemName[]=request.getParameterValues("item");
       if(itemName==null){
          out.print("未添加购物车");
       }else{
          for(int i=0;i<itemName.length;i++){
          out.print((i+1)+"."+itemName[i]+"<br>");
          }
       }
     %>
  </body>
</html>

posted @ 2022-04-24 13:33 袁祥凤阅读(30) 评论(0) 收藏举报

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jsp第八周作业

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