Servlet/Jsp实现购物车

(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）

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（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：

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

点击查看购物车：

OK！

简单的购物车到此结束！

巴特西

Servlet/Jsp实现购物车

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