Servlet+jsp实现简单购物车

article/2025/10/17 18:20:42

功能：BuyBook.jsp上输入所购书名，然后在下面就显示输入的书名，书名后有删除的链接，点删除就从购物车中删除。不涉及数据库。

文件：BuyBook.jsp 、BuyServlet.java ,Servletjsp是我的站点名，架构如下

Servlet+jsp基础应用 - lysm - lysm

(在MyEclipse下进行的测试，新建项目、servlet之类的就不说了)

代码：

BuyBook.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%
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>
    <title>My JSP 'BuyBook.jsp' starting page</title>
</head>

<body>
   <form action ="/Servletjsp/servlet/BuyServlet" >
   请输入书名：
   <input name="ope" type="hidden" value="add" />
   <input name="book" />
   <br/>
   <input type="submit" value="add to cart" />
   </form>
   <%
   ArrayList gwc = (ArrayList)session.getAttribute("gwc");
   if(gwc!=null){
     for(int i=0;i<gwc.size();i++){
      out.println(gwc.get(i));
      out.println("<a href=/Servletjsp/servlet/BuyServlet?ope=delete&book="+gwc.get(i)+">删除</a>");
     }
   }
    %>
</body>
</html>

BuyServlet.java

package servlet;

import java.io.IOException;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class BuyServlet extends HttpServlet {

public BuyServlet() {
super();
}

public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

  String book = request.getParameter("book");
  String ope = request.getParameter("ope");
  HttpSession session = request.getSession();
  ArrayList gwc = (ArrayList)session.getAttribute("gwc");
  if(gwc == null){
   gwc = new ArrayList();
   session.setAttribute("gwc",gwc);
  }
  if(ope.equals("add")){
      gwc.add(book);//添加到购物车
  }
  if(ope.equals("delete")){
   gwc.remove(book);
  }

  response.sendRedirect("/Servletjsp/BuyBook.jsp");
}

public void init() throws ServletException {
// Put your code here
}

}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

<servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>BuyServlet</servlet-name>
    <servlet-class>servlet.BuyServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>BuyServlet</servlet-name>
<url-pattern>/servlet/BuyServlet</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
运行结果：

Servlet+jsp基础应用 - lysm - lysm