myshoppercartservlet.java

java sql jsp javabean

package com.gc.biz;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

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

import com.gc.action.PagesBean;
import com.gc.action.Products;
import com.gc.dao.DProducts;

public class MyShopperCartServlet extends HttpServlet {
	private List list;
	private double total = 0;
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");

		if(request.getParameter("pid")!=null)
		{
			int pid = Integer.parseInt(request.getParameter("pid"));
			DProducts dp = new DProducts();
			if(request.getSession().getAttribute("shopper")==null)
			{
			   list = new ArrayList();
			   List<Products> li = dp.selectProductsByPID(pid);
			   Iterator<Products> iter = li.iterator();
			   while(iter.hasNext())
			   {
				   Products pro = iter.next();
				   pro.setAmount(1);
				   total=pro.getPprice();
				   break;
			   }
			   list.add(li);
			}else
			{
			   boolean isnew = false;
			   list = (List)request.getSession().getAttribute("shopper");
			   Iterator it = list.iterator();
				while(it.hasNext())//存放商品集合的循环
				{
					List<Products> lit = (List)it.next();
					Iterator<Products> ite = lit.iterator();
					while(ite.hasNext())//循环商品中的所有属性值
					{
						Products pro = ite.next();
						if(pro.getPid()==pid)//如果有存在的商品则累加数量
						{
							pro.setAmount(pro.getAmount()+1);
							total+=pro.getPprice();
							isnew = false;
							break;
						}else  						//否则添加新的商品,将数量置为1
						{
							isnew = true;
							break;
						}
					}
					if(isnew==false)//保证循环次数为1次
					{
						break;
					}
				}
				if(isnew == true)
				{
					List<Products> li = dp.selectProductsByPID(pid);
					Iterator<Products> iter = li.iterator();
					while(iter.hasNext())
					{
						Products pro = iter.next();
						pro.setAmount(1);
						total+=pro.getPprice();
						break;
					}
					list.add(li);
				}
				
			}
			request.getSession().setAttribute("shopper", list);
			request.getSession().setAttribute("price", total);
			if(request.getParameter("cate")!=null)
			{
				request.getRequestDispatcher("/servlet/ProductsCategoryServlet").forward(request, response);
			}else
			{
				if(request.getSession().getAttribute("pro")!=null)
				{
					PagesBean page = (PagesBean)request.getSession().getAttribute("pro");
					request.getRequestDispatcher("/servlet/BodyServlet?page="+page.getCurrentIndex()+"").forward(request, response);
				}
			}
		}
	}
}