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"%>

<html>
  <head>
  </head>
  <body>
 <script type="text/javascript">
 function yz(){
            if(loginForm.uname.value==""){
                alert("账号不能为空!");
                return;
            }
            if(loginForm.password.value==""){
                alert("密码不能为空!");
                return;
            }
            loginForm.submit();
        }
 </script>
  
    <form action="dologin.jsp" method="post" name="loginForm">
    用户名:<input type="text" name="uname"/><br>
    密码:&nbsp;&nbsp;&nbsp;
    <input type="password" name="password" /><br>
    <input type="button" value="登录" style="margin-left: 120px" onclick="yz()"/>
    
    </form>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>


</head>

<body>
    <%
        String uname = request.getParameter("uname");
        String password = request.getParameter("password");
        if (uname.equals(password)) {
            session.setAttribute("uname", uname);
            request.getRequestDispatcher("main.jsp").forward(request,response);
        } else {
            response.sendRedirect("fail.jsp");
        }
    %>

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

<html>
<head>


</head>

<body>
    <%
        request.setCharacterEncoding("utf-8");
        String uname = (String) session.getAttribute("uname");
        if (uname == null) {
            response.sendRedirect("login.jsp");
        }
    %>

    登陆成功！！！
    <br> 欢迎您 :
    <%=uname%>
    <a href="login.jsp">退出</a>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>


</head>

<body>
    
        登录失败！！！
    <%
    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）

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

<html>
  <head>
  </head>
  <body>
  <script type="text/javascript">
        function btn(){
            if(loginForm.uname.value==""){
                alert("账号不能为空!");
                return;
            }
            if(loginForm.password.value==""){
                alert("密码不能为空!");
                return;
            }
    
            loginForm.submit();
        }
    </script>
  
    <form action="dologin.jsp" method="post" name="loginForm">
    用户名:<input type="text" name="uname"/><br>
    密码:&nbsp;&nbsp;&nbsp;
    <input type="password" name="password" /><br>
    <input type="button" value="登录" style="margin-left: 120px" onclick="btn()"/>
    
    </form>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>


</head>

<body>
    <%
       request.setCharacterEncoding("utf-8");
        String uname = request.getParameter("uname");
        String password = request.getParameter("password");
        if (uname.equals(password)) {
            session.setAttribute("uname", uname);
            request.getRequestDispatcher("main.jsp").forward(request,response);
        } else {
            response.sendRedirect("login.jsp");
        }
    %>

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

<html>
<head>


</head>

<body>
    <%
        request.setCharacterEncoding("utf-8");
        String uname = (String) session.getAttribute("uname");
        if (uname == null) {
            response.sendRedirect("login.jsp");
        }
    %>

    登陆成功！！！
    <br> 欢迎您 :
    <%=uname%>
    <a href="login.jsp">退出</a>
    <hr>
    <form action="cart.jsp" method="post">
    <table >
            <tr>
                <td>商品名称</td>
                <td>价格(元)</td>
                <td>&nbsp;&nbsp;&nbsp;加购</td>
            </tr>
            <tr>
                <td>羽毛球</td>
                <td>&nbsp;&nbsp;5</td>
                <td>&nbsp;&nbsp;&nbsp;&nbsp;<input type="checkbox" name="checked" value="羽毛球"/>
                </td>
            </tr>
            <tr>
                <td>毽子</td>
                <td>&nbsp;&nbsp;6</td>
                <td>&nbsp;&nbsp;&nbsp;&nbsp;<input type="checkbox" name="checked" value="毽子"/>
                </td>
            </tr>
            <tr>
                <td>乒乓球</td>
                <td>&nbsp;&nbsp;3</td>
                <td>&nbsp;&nbsp;&nbsp;&nbsp;<input type="checkbox" name="checked" value="乒乓球"/>
                </td>
            </tr>
            <tr><td>
            <input type="submit" value="显示购物车"/>
            </td></tr>
            
    </table>

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

<html>
  <head>
  </head>
  <body>
您的购物车有：<br>
 <%
    request.setCharacterEncoding("utf-8");
    String thing[]=request.getParameterValues("checked");
    if(thing==null){
    out.print("您还没有加入任何东西，快去主页看看吧！");
    }
    else{
    for(int i=0;i<thing.length;i++){
    out.print("("+(i+1)+")"+thing[i]+"<br>");
    }
    }
     %>

  
  </body>
</html>

 

 

posted @ 2022-04-24 17:40  聂芳芳  阅读(13)  评论(0)    收藏  举报