Jsp+Servlet实现购物车功能

2020-07-27 21:21:20

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本文实例为大家分享了Servlet实现购物车功能的具体代码，供大家参考，具体内容如下

(1)用servlet实现简单的购物车系统，项目结构例如以下：（新建web Project项目仅仅须要AddItemServlet ， ListItemServlet。exam403.jsp三个文件就可以。其它的不用管）

（2）exam403.jsp代码例如以下：

<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>无标题文档</title></head><body><form id="form1" name="form1" method="post" action="/servletProject/addItem"> <label></label> 商品: <select name="itemID" id="itemID"> <option value="洗衣粉">洗衣粉</option> <option value="香皂">香皂</option> <option value="食用油">食用油</option> </select> <p>数量: <label> <input name="quantity" type="text" id="quantity" value="1" /> </label> <label> <input type="submit" name="Submit" value="提交" /> </label> <a href="/servletProject/listItem">查看购物车</a></p></form></body></html>

（3）AddItemServlet代码例如以下：

package com.lc.shoppingCar;import javax.servlet.*;import javax.servlet.http.*;import java.io.*;import java.util.*;public class AddItemServlet extends HttpServlet {  protected void doGet(HttpServletRequest request,HttpServletResponse response)       throws ServletException,java.io.IOException {  ServletContext application=getServletContext() ;  ServletConfig config=getServletConfig() ;  response.setContentType("text/html;charset=gb2312");  PrintWriter out=response.getWriter();   HttpSession session =request.getSession();  request.setCharacterEncoding("gb2312");    //读取表单传入的商品ID及数量  String id=request.getParameter("itemID");  String num=request.getParameter("quantity"); if(id!=null && num.length()!=0) { //从Sessionn中读取购物车 HashMap shoppingCar=(HashMap)session.getAttribute("shoppingCar");  if(shoppingCar==null)  shoppingCar=new HashMap();  //将商品加入到购物车中  String onum=(String)shoppingCar.get(id);  if(onum==null)   shoppingCar.put(id,num);  else  {  int n1=Integer.parseInt(num);  int n2=Integer.parseInt(onum);  String result=String.valueOf(n1+n2);  shoppingCar.put(id,result);  }    //将购物车写回session中保存  session.setAttribute("shoppingCar",shoppingCar);  } else //假设传入的商品ID号为空或数量为空。显示提示信息  System.out.print("商品ID号为空会或数量为空！"); //返回商品列表页 response.sendRedirect("/servletProject/exam403.jsp");   }   protected void doPost(HttpServletRequest request,HttpServletResponse response)        throws ServletException,java.io.IOException {  doGet(request,response); }}

（4）ListItemServlet代码例如以下：

package com.lc.shoppingCar;import javax.servlet.*;import javax.servlet.http.*;import java.io.*;import java.util.*;public class ListItemServlet extends HttpServlet {  protected void doGet(HttpServletRequest request,HttpServletResponse response)       throws ServletException,java.io.IOException {  ServletContext application=getServletContext() ;  ServletConfig config=getServletConfig() ;  response.setContentType("text/html;charset=gb2312");  PrintWriter out=response.getWriter();   HttpSession session =request.getSession();  request.setCharacterEncoding("gb2312");    //从session中获取购物车 HashMap shoppingCar=(HashMap)session.getAttribute("shoppingCar"); //显示购物车中的内容 if(shoppingCar!=null) {  Set show=shoppingCar.entrySet();  Iterator it=show.iterator();  while(it.hasNext())  {   out.print(it.next()+"<br>");  } } else  out.print("购物车为空。");   }   protected void doPost(HttpServletRequest request,HttpServletResponse response)        throws ServletException,java.io.IOException {  doGet(request,response); }}

（5）实现效果例如以下：

问：http://localhost:8080/servletProject/exam403.jsp 学则商品提交