本文實(shí)例為大家分享了Servlet實(shí)現(xiàn)購(gòu)物車(chē)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(jiǎn)單的購(gòu)物車(chē)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(wú)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(gòu)物車(chē)/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(gòu)物車(chē) HashMap shoppingCar=(HashMap)session.getAttribute("shoppingCar"); if(shoppingCar==null) shoppingCar=new HashMap(); //將商品加入到購(gòu)物車(chē)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(gòu)物車(chē)寫(xiě)回session中保存 session.setAttribute("shoppingCar",shoppingCar); } else //假設(shè)傳入的商品ID號(hào)為空或數(shù)量為空。顯示提示信息 System.out.print("商品ID號(hào)為空會(huì)或數(shù)量為空!"); //返回商品列表頁(yè) 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(gòu)物車(chē) HashMap shoppingCar=(HashMap)session.getAttribute("shoppingCar"); //顯示購(gòu)物車(chē)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(gòu)物車(chē)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(fǎng)問(wèn):http://localhost:8080/servletProject/exam403.jsp 學(xué)則商品 提交
點(diǎn)擊查看購(gòu)物車(chē):
OK!
簡(jiǎn)單的購(gòu)物車(chē) 到此結(jié)束!
以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。
標(biāo)簽:內(nèi)江 廣州 南京 黃石 大連 銅川 貸款邀約 樂(lè)山
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