第八次作業

1.登陸

輸入用戶名密碼，判斷用戶名和密碼相同，登陸成功，session中保存用戶的用戶名，進入主頁main.jsp，主頁有一個退出按鈕，點擊，回到登陸頁login.jsp。要求：退出登錄后，如果在瀏覽器直接輸入主頁main.jsp，訪問不了，直接跳到登陸頁。

2.購物車
和上一題一起，在main.jsp中做一個購物車，里面顯示3個商品名和價格每一個后面有一個加入購物車按鈕，main.jsp中有一個按鈕（或者超鏈接）可以顯示購物車。（選作：在購物車中加刪除按鈕刪除商品）

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
  <head>    
    <title></title>
    <script type="text/javascript">
    function v() {
        if (loginForm.uname.value=="") {
            alert("賬號不能為空！");
            return;
        }
        if (loginForm.password.value=="") {
            alert("密碼不能為空！");
            return;
        }
        loginForm.submit();
    }
    </script>
  </head>  
  <body>
  <form name="loginForm" action="1.oblogin.jsp" method="post">
  賬號：<input type="text" name="uname"><br>
  密碼：<input type="password" name="password"> <br> 
  <input type="submit" value="登錄" onclick="v()">
  </form>  
  </body></html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
  <head>    
    <title></title>
  </head>  
  <body>
  <%
  String uname=(String)session.getAttribute("uname");if(uname==null)
      response.sendRedirect("login.jsp");
   %>
  <a href="1.out.jsp">退出登錄</a> <br>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html><head><title></title></head><body>
    登陸失敗，請重試！
    <%
      response.setHeader("refresh", "5;url=login.jsp");
    %></body></html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html><head><title></title></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("false.jsp");
        }
    %>
</body></html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
  <head>    
    <title></title>
  </head>  
  <body>
  <%
    session.invalidate();
    response.setHeader("refresh", "5;url=login.jsp");
  %>
退出成功!
  </body></html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><html><head><title></title></head>
<body>
    
    <%
        String uname = (String) session.getAttribute("uname");
        if (uname == null)
            response.sendRedirect("login.jsp");
    %>

    歡迎你<%=uname%>
    <a href="logout.jsp">退出登錄</a>
    <br>
    玉米￥10<a href="buy.jsp?sgname=1">購買</a><br>
           土豆￥9.9<a href="buy.jsp?sgname=2">購買</a><br>

</body></html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><html><head><title></title></head><body>
    <%
        ArrayList books = (ArrayList) session.getAttribute("sgs");
        if (sgs == null) {
            sgs = new ArrayList();
            session.setAttribute("sgs",sgs);
        }
        String sgname = request.getParameter("sgname");
        String sg01="玉米,價格：20元";
        String sg02="土豆,價格：30元";
        if (sgname != null) {
            sgname = new String(sgname.getBytes("ISO-8859-1"), "utf-8");
            if(sgname.equals("1")){
                sgs.add(sg01);
            }else{
                books.add(book02);
            }
        }
        String delete = request.getParameter("delete");
        if (delete != null) {
            int i = Integer.parseInt(delete);
           sgs.remove(i);
            
        }
    %>
    購物車中的信息為：
    <br>
    <%
        int i = 0;
        for (i = 0; i <sgs.size(); i++) {
    %>
    <a href="buy.jsp?delete=<%=i%> ">刪除</a>
    <%
        out.println(sgs.get(i) + "<br>");
        }
    %>
    <a href="main.jsp">返回主頁面</a></body></html>

posted on 2022-04-24 19:58 李育博閱讀(15) 評論(0) 收藏舉報

刷新頁面返回頂部

公告