additemtocartservlet.java

该源码为java购物车项目源码

package www.mary.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import www.mary.Bean.Cart;
import www.mary.Bean.ProitemBean;
import www.mary.access.PowerAccess;

public class AddItemToCartServlet extends HttpServlet 
{
	
	public AddItemToCartServlet() {
		super();
	}
	public void init() throws ServletException
	{
		
	}
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		HttpSession session=request.getSession(true);
		String type=request.getParameter("type");    //类型
		if(type.equals("update"))
		{
		   Cart cart=null;
		   if(session.getAttribute("cart")!=null)
		   cart=(Cart)session.getAttribute("cart"); 
		   Enumeration enums=request.getParameterNames(); //动态得到页面传递过来所有变量名	
		   while(enums.hasMoreElements())
		   {
			   String itemid=enums.nextElement().toString();
			  if(itemid.equals("type")||itemid.equals("submit"))
			  {
			  }else{
			   String value=request.getParameter(itemid);
			   cart.updateNumber(itemid,Integer.parseInt(value));
			  }
			   //String value=request.getParameter("dog01");
		   }
		}else{
		  String itemid=request.getParameter("itemid");//要购买或要删除的产品项编号
		  if(type.endsWith("add"))
		  {
		    if(session.getAttribute("cart")!=null)
		    {
			  Cart cart=(Cart)session.getAttribute("cart"); 
			  cart.additem(itemid,1);
		    }else{
			  Cart cart=new Cart();
			  cart.additem(itemid,1);
			  session.setAttribute("cart",cart);
		    }
		  }else if(type.endsWith("remove")){
			 Cart cart=(Cart)session.getAttribute("cart");
			 cart.removeItem(itemid);
		  }
		}  
		response.sendRedirect("./cart.jsp");
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		this.doGet(request,response);
	}
	public void destroy() 
	{
	}

}