贾云鹏

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。

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
  </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>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <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>
<!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 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 'no.jsp' starting page</title>

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

</body>
</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'logout.jsp' starting page</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>
  
  <body>
      <h1>退出成功</h1>
    <%
    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。

<!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>

 

（选作：在购物车中加删除按钮删除商品）

posted on 2022-04-24 11:22  贾云鹏  阅读(15)  评论(0)  编辑  收藏  举报

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