ServletJsp实现购物车


(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.len >h()!=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 resu< =String.valueOf(n1+n2);
		   shoppingCar.put(id,resu< );
	     }   
         //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!


Servlet/Jsp实现购物车

原文地址:http://www.cnblogs.com/gavanwanggw/p/7304912.html


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