JSP第六次作业

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"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
</head>
<body>
  <form action="aaa.jsp">
  用户名<input type="text" value="cby" name="id"/>
  密码<input type="password" value="cby" name="psw"/> 
  <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></title>
</head>
<html>
    <%
  String id=request.getParameter("id");
  String psw=request.getParameter("psw");
  if(id.equals(psw)){
  session.setAttribute("id", id);
  request.getRequestDispatcher("circle.jsp").forward(request, response);
  }
   %>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
</head>
 
  <%
  String sid=(String)session.getAttribute("id");
  if(sid==null){
  response.sendRedirect("a2.jsp");
  }
   %>
  <body>
  id为:<%=sid %>
  <a href="a2.jsp">退出</a>
  </body>
    </html>

 

 

 

 

 

 

2.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）

package Buy;

public class Java1 {
     String name;
        double money;
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public double getMoney() {
            return money;
        }
        public void setMoney(double money) {
            this.money = money;
        }
        @Override
        public String toString() {
            return "Java1 [name=" + name + ", money=" + money + "]";
        }
        
    }
package Buy;

import java.util.ArrayList;
import java.util.List;

public class Java2 {
     public List list=new ArrayList();
        public void fangfa(String name,double money){
            Java1 a=new Java1();
            a.setName(name);
            a.setMoney(money);
            list.add(a);
        }
    }
<%@page import="Buy.Java2"%>
<%@page import="Buy.Java1"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
function fangfa1(){
var a=document.getElementById("b1");
var b=document.getElementById("h1");
b.value=a.value;
}
function fangfa2(){
var a=document.getElementById("b2");
var b=document.getElementById("h2");
b.value=a.value;
}
function fangfa3(){
var a=document.getElementById("b3");
var b=document.getElementById("h3");
b.value=a.value;
}
</script>


<form action="circle.jsp">
                   炒米粉&nbsp&nbsp价格：15
    <input type="button" value="加入购物车" id="b1" name="b1" onclick="fangfa1()" />
    <input type="hidden" value="" name="h1" />
    <br> 炸鸡腿&nbsp&nbsp价格：8
    <input type="button" value="加入购物车" name="b2" onclick="fangfa2()"/>
    <input type="hidden" value="" name="h2" />
    <br> 烤肉&nbsp&nbsp价格：6
    <input type="button" value="加入购物车" name="b3"  onclick="fangfa3()"/>
    <input type="hidden" value="" name="h3" />
    <br>
    <input type="submit" value="购买"/>
    </form>
</body>
</html>
<%@page import="Buy.Java2"%>
<%@page import="Buy.Java1"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title></title>
  </head>
  <% 
  ArrayList list1=(ArrayList)session.getAttribute("gouwuche");
  Java1 c=new Java1();
  
  for(int i=0;i<list1.size();i++){
  c=(Java1)list1.get(i);
  String name=c.getName();
  double money=c.getMoney();
  out.print("您的物品："+name+",价格为："+money+"<br>");
  } 
  
  %>
  <body>
  <a href="a2.jsp">返回</a>
  </body>
</html>
<%@page import="Buy.Java2"%>
<%@page import="Buy.Java1"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
</head>
<%!Java2 q = new Java2(); %>
<%
    request.setCharacterEncoding("utf-8");
    String h1 = request.getParameter("h1");
    String h2 = request.getParameter("h2");
    String h3 = request.getParameter("h3");
    if (!h1.isEmpty()) {
        q.fangfa("炒米粉", 15);
    }
    if (!h2.isEmpty()) {
        q.fangfa("炸鸡腿", 8);
    }
    if (!h3.isEmpty()) {
        q.fangfa("烤肉", 6);
    }
    session.setAttribute("gouwuche", q.list);
    request.getRequestDispatcher("aaa.jsp").forward(request, response);
%>
<body>
</body>
</html>

 

 

 

 

 

 

posted @ 2022-04-24 19:41  YilT🍬  阅读(25)  评论(0)  编辑  收藏  举报