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Jsp+Servlet实现购物车功能_JSP编程_

2023-05-25 321人已围观

简介 Jsp+Servlet实现购物车功能_JSP编程_

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：

无标题文档 商品: 数量: 查看购物车

（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()+"
"); } } 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：

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