Jsp+Servlet實現購物車功能

2024-09-05 00:23:16

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本文實例為大家分享了Servlet實現購物車功能的具體代碼，供大家參考，具體內容如下

(1)用servlet實現簡單的購物車系統，項目結構例如以下：（新建web Project項目僅僅須要AddItemServlet ， ListItemServlet。exam403.jsp三個文件就可以。其它的不用管）

Jsp,Servlet,購物車

（2）exam403.jsp代碼例如以下：

<%@ 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>無標題文檔</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>數量:  <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">查看購物車</a></p></form></body></html>

（3）AddItemServlet代碼例如以下：

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");      //讀取表單傳入的商品ID及數量   String id=request.getParameter("itemID");  String num=request.getParameter("quantity"); if(id!=null && num.length()!=0) { //從Sessionn中讀取購物車 HashMap shoppingCar=(HashMap)session.getAttribute("shoppingCar");   if(shoppingCar==null)    shoppingCar=new HashMap();   //將商品加入到購物車中   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);   }       //將購物車寫回session中保存   session.setAttribute("shoppingCar",shoppingCar);   }  else //假設傳入的商品ID號為空或數量為空。顯示提示信息   System.out.print("商品ID號為空會或數量為空！");  //返回商品列表頁  response.sendRedirect("/servletProject/exam403.jsp");     }    protected void doPost(HttpServletRequest request,HttpServletResponse response)                throws ServletException,java.io.IOException {   doGet(request,response);  }}

（4）ListItemServlet代碼例如以下：

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");       //從session中獲取購物車 HashMap shoppingCar=(HashMap)session.getAttribute("shoppingCar");  //顯示購物車中的內容  if(shoppingCar!=null)  {    Set show=shoppingCar.entrySet();    Iterator it=show.iterator();    while(it.hasNext())    {     out.print(it.next()+"<br>");    }  }  else    out.print("購物車為空。");    }    protected void doPost(HttpServletRequest request,HttpServletResponse response)                throws ServletException,java.io.IOException {   doGet(request,response);  }}

（5）實現效果例如以下：

訪問：http://localhost:8080/servletProject/exam403.jsp 學則商品提交

Jsp,Servlet,購物車