jsp第八周作业

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>My JSP 'login.jsp' starting page</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>

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    
    <title>My JSP 'dologin.jsp' starting page</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>

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
   
    <title>My JSP 'main.jsp' starting page</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>

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
   
    <title>My JSP 'no.jsp' starting page</title>
    
  </head>
  
  <body>
  <h1>登陆失败！！</h1>
    <%response.setHeader("refresh", "5;url=login.jsp");%>
 
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

  </head>
  
   <body>
    <h1>登陆成功！</h1>

    <%
        String uname = (String) session.getAttribute("uname");
        if (uname == null)
            response.sendRedirect("login.jsp");
            
    %>
    <form action="buy.jsp">
         是否加入购物车？<br> <input type="checkbox" name="item" value="grape">
         葡萄 $1<br> <input type="checkbox" name="item"  value="banana">
         香蕉 $2<br> <input type="checkbox" name="item"  value="apple">
         苹果 $3<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>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'buy.jsp' starting page</title>


  </head>
  
<body>

    <h2>购物车</h2>
    <%
        request.setCharacterEncoding("utf-8");
        String itemName[] = request.getParameterValues("item");
        if (itemName == null) {
            out.print("购物车为空");
        } else {
            for (int k = 0; k < itemName.length; k++) {
                out.print("(" + (k + 1) + ")" + itemName[k] + "<br>");
            }
        }
    %>

</body>
</html>

posted on 2022-04-24 17:44 陶醉～阅读(9) 评论(0) 编辑收藏举报

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