javaweb开发技术-第五章实验
2022-09-18 19:23:54 # javaweb #code #javaweb #application

javaweb开发技术教程（第二版）第五章实验

将用户的会话信息存储在session中

goods.jsp

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<%--
  Created by IntelliJ IDEA.
  User: DELL
  Date: 2022/9/18
  Time: 17:08
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=GBK" language="java" %>
<html>
<head>
    <title>Title</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }
        h3 {
            text-align: center;
        }
        .tb {
            margin: 40px auto;
            width: 300px;
            height: 250px;
        }
        table {
            width: 100%;
            height: 80%;
        }
        button {
            display: block;
            width: 80px;
            height: 30px;
            margin: 10px auto;
        }
    </style>
</head>
<body>
<h3>商品列表</h3>
<form action="goods_ok.jsp" method="post" class="tb">
    <table border="1px">
        <tr>
            <td>商品标号</td>
            <td>商品名称</td>
            <td>商品价格</td>
        </tr>
        <tr>
            <td><input type="checkbox" name="goods" value="图书">1</td>
            <td>图书</td>
            <td>20</td>
        </tr>
        <tr>
            <td><input type="checkbox" name="goods" value="CD">2</td>
            <td>CD</td>
            <td>10</td>
        </tr>
        <tr>
            <td><input type="checkbox" name="goods" value="衣服">3</td>
            <td>衣服</td>
            <td>390</td>
        </tr>
        <tr>
            <td><input type="checkbox" name="goods" value="玩具">4</td>
            <td>玩具</td>
            <td>5</td>
        </tr>
        <tr>
            <td><input type="checkbox" name="goods" value="手机">5</td>
            <td>手机</td>
            <td>2090</td>
        </tr>
    </table>
    <button type="submit">购买</button>
</form>
</body>
</html>

goods_ok.jsp

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<%@ page import="java.util.ArrayList" %>
<%@ page import="java.lang.reflect.Array" %>
<%@ page import="java.util.Arrays" %><%--
  Created by IntelliJ IDEA.
  User: DELL
  Date: 2022/9/18
  Time: 17:18
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=GBK" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
  <%
    request.setCharacterEncoding("GBK");
    String[] goods = request.getParameterValues("goods");
    if(goods == null){
      out.println("您没有选中的物品");
      out.println("<a href='goods.jsp'>返回商店</a>");
    }
    else{
      out.println("您确定要购买：");
      for(String t:goods){
        out.print(t+' ');
      }
      out.println('?');
      ArrayList<String> carts = (ArrayList<String>)session.getAttribute("carts");
      if(carts==null){
        carts = new ArrayList<String>();
      }
      ArrayList<String> carts_add = (ArrayList<String>)session.getAttribute("carts_add");
      if(carts_add==null){
        carts_add = new ArrayList<String>();
      }
      for(String t:goods){
        if(!carts.contains(t)){
          carts_add.add(t);
        }
      }
      session.setAttribute("carts_add",carts_add);
  %>
  <a href="carts_yes.jsp">是</a>
  <a href="carts_no.jsp">否</a>
  <%
    }
  %>
</body>
</html>

carts_yes.jsp

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<%@ page import="java.util.ArrayList" %><%--
  Created by IntelliJ IDEA.
  User: DELL
  Date: 2022/9/18
  Time: 18:16
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
  <%
    request.setCharacterEncoding("GBK");
    ArrayList<String> carts = (ArrayList<String>)session.getAttribute("carts");
    ArrayList<String> carts_add = (ArrayList<String>)session.getAttribute("carts_add");
    if(carts==null){
      carts = new ArrayList<String>();
    }
    if(carts_add == null){
      carts_add = new ArrayList<String>();
    }
    for(String t:carts_add){
      carts.add(t);
    }
    session.setAttribute("carts",carts);
    response.sendRedirect("carts.jsp");
  %>
</body>
</html>

carts_no.jsp

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<%@ page import="java.util.ArrayList" %><%--
  Created by IntelliJ IDEA.
  User: DELL
  Date: 2022/9/18
  Time: 18:16
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%

    session.setAttribute("carts_add",null);
    response.sendRedirect("goods.jsp");
%>
</body>
</html>

carts.jsp

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<%@ page import="java.util.ArrayList" %><%--
  Created by IntelliJ IDEA.
  User: DELL
  Date: 2022/9/18
  Time: 18:22
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
  <%
      request.setCharacterEncoding("GBK");
      ArrayList<String> carts = (ArrayList<String>)session.getAttribute("carts");
      ArrayList<String> carts_add = (ArrayList<String>)session.getAttribute("carts_add");
      out.print("本次新增购买的商品: ");
      for(String t:carts_add){
          out.print(t+' ');
      }
      out.println();
      out.print("您的购物车里共有: ");
      for(String t:carts){
          out.print(t+' ');
      }
      out.println("<a href='goods.jsp'>返回商店</a>");
  %>
</body>
</html>

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