本文實(shí)例為大家分享了Servlet實(shí)現(xiàn)購物車功能的具體代碼,供大家參考,具體內(nèi)容如下
(1)用servlet實(shí)現(xiàn)簡單的購物車系統(tǒng),項(xiàng)目結(jié)構(gòu)例如以下:(新建web Project項(xiàng)目 僅僅須要AddItemServlet , ListItemServlet。exam403.jsp三個(gè)文件就可以。其它的不用管)
(2)exam403.jsp代碼例如以下:
html xmlns="http://www.w3.org/1999/xhtml">
head>
meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
title>無標(biāo)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(shù)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(shù)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(shè)傳入的商品ID號為空或數(shù)量為空。顯示提示信息
System.out.print("商品ID號為空會(huì)或數(shù)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(nèi)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(shí)現(xiàn)效果例如以下:
訪問:http://localhost:8080/servletProject/exam403.jsp 學(xué)則商品 提交
點(diǎn)擊查看購物車:
OK!
簡單的購物車 到此結(jié)束!
以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。
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