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JSP制作網頁購物車

1,運作環境Tomacat8,JDBC驅動,Eclipse

2.首先制作商品購買頁面

這是開頭部分

<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
           

meta标簽實作網頁功能

!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <title>My JSP 'buy.jsp' starting page</title>
  <meta http-equiv="pragma" content="no-cache">
 <meta http-equiv="cache-control" content="no-cache">
 <meta http-equiv="expires" content="0">    
 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 <meta http-equiv="description" content="This is my page">
 <!--
 <link rel="stylesheet" type="text/css" href="styles.css">
 -->
 </head>  
           

顯示購買頁面

<body>
   <table>
   <tr><td>商品名稱</td><td>商品單價</td><td>購買</td></tr>
    <form action="addCar.jsp" method="post">
   <tr><td>手機</td><td>2000</td><td><input type="submit" name="buy" value="購買"/></td></tr>
   <!-- 表單中通過隐藏域把參數偷偷傳給伺服器的目标頁面 -->
   <input type="hidden" name="goodname" value="手機"/>
   <input type="hidden" name="price" value="2000"/>
   </form>
   <form action="addCar.jsp" method="post">
     <tr><td>ipad</td><td>2000</td><td><input type="submit" name="buy" value="購買"/></td></tr> 
     <input type="hidden" name="goodname" value="ipad"/>
   <input type="hidden" name="price" value="2000"/>
 </form>
  <form action="addCar.jsp" method="post">
    <tr><td>筆記本</td><td>2000</td><td><input type="submit" name="buy" value="購買"/></td></tr> 
    <input type="hidden" name="goodname" value="筆記本"/>
   <input type="hidden" name="price" value="2000"/>
   </form>
  <form action="addCar.jsp" method="post">
   <tr><td>硬碟</td><td>2000</td><td><input type="submit" name="buy" value="購買"/></td></tr>
   <input type="hidden" name="goodname" value="硬碟"/>
   <input type="hidden" name="price" value="2000"/>
  </form>
   </table>
   <a href="chap4/addCar.jsp">檢視購物車</a>
   </body>`在這裡插入代碼片`
</html>
           

如此制作完成的網頁打開如下圖

JSP制作網頁購物車

之後增加購物車處理頁面,做到可以檢視購物車

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
   <%@page import="java.util.ArrayList"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<% 
request.setCharacterEncoding("UTF-8");
String good=request.getParameter("goodname");
ArrayList car=null;
car=(ArrayList)session.getAttribute("car");
if(car==null){
 car=new ArrayList();
if(good!=null && !good.isEmpty()){
 car.add(good);
}
session.setAttribute("car", car);
}
else{
 if(good!=null && !good.isEmpty()){
  car.add(good);
 }
 session.setAttribute("car", car);
}
car=(ArrayList)session.getAttribute("car");
if(car!=null){
 for(int i=0;i<car.size();i++){
  out.print(car.get(i)+"<br/>");
 }
}
%>
<a href="buy.jsp">繼續購物</a>
</body>
<html>
           

這樣可以實作對購物車的增删改查