第八周Jsp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"%>
    <%
    request.setCharacterEncoding("UTF-8");
    response.setCharacterEncoding("UTF-8");
    %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <script type="text/javascript">
        function yz(){
            if (fm.uname.value=="") {
                alert("请输入账号");
                return;
            }
            else if (fm.pas.value=="") {
                alert("请输入密码");
                return;
            }
            fm.submit();
        }
    </script>
  <body>  
    <form action="dologin.jsp" name="fm">
    用户名：<input type="text" name="uname" />
     密码：<input type="password" name="pas" />
    <input type="button" value="登录" onclick="yz()" />
    </form>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  </head>
    <%
    request.setCharacterEncoding("UTF-8");
    response.setCharacterEncoding("UTF-8");
    %>
  <body>
     <%
        request.setCharacterEncoding("utf-8");
        String uname = request.getParameter("uname");
        String password = request.getParameter("pas");
        if (uname.equals(password)) {
            session.setAttribute("uname", uname);
            request.getRequestDispatcher("main.jsp").forward(request, response);
        } else {
            response.sendRedirect("no.jsp");
        }
    %>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
  <%
    request.setCharacterEncoding("UTF-8");
    response.setCharacterEncoding("UTF-8");
    %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  </head>
  <body>
  <%
    session.invalidate();
    response.setHeader("refresh", "5;url=index.jsp");
  %>
退出成功!
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
  <%
    request.setCharacterEncoding("UTF-8");
    response.setCharacterEncoding("UTF-8");
    %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  </head>
  <body>
  <%
  String uname=(String)session.getAttribute("uname");
  //如果他是空，说明没登陆，直接访问该页面了
  if(uname==null)
      response.sendRedirect("index.jsp");
   %>
   欢迎你<%=uname %>
  <a href="exit.jsp">退出登录</a> <br>
  </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）

posted @ 2022-04-24 17:11  星星邮寄者  阅读(27)  评论(0)  编辑  收藏  举报