cartmessservlet.java

网上购物源代码

package com.chinaaccpservlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;

import javax.servlet.RequestDispatcher;
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 com.chinaaccpDao.CartDao;
import com.chinaaccpbean.CartBean;

public class CartMessServlet extends HttpServlet {

	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setHeader("param", "no-no-cache");
		response.setHeader("cache-control", "no-cache");
		HttpSession session = request.getSession();
		HashSet hs = (HashSet)session.getAttribute("set");
		HashMap hm = (HashMap)session.getAttribute("hashmap");
		CartDao cart = new CartDao();
		ArrayList cartlist = new ArrayList();
		PrintWriter out = response.getWriter();
		
		if(hs!=null)
		{
			Object[] obj = hs.toArray();//实现Set接口的实例没有获得内容的方法，所以转换成数组来取出来
			if(obj.length==0)
			{
				out.println("你还没有购买任何物品");
				out.println("<div>");
				out.println("<img src='Image/Go_Off.gif' onclick='javascript:location.href=\"DisServlet\"' style='cursor:pointer'>");
				out.println("</div>");
				return;
			}
			
			
			/*
			 * 也可以用iterator()来返回一个迭代器。然后在用hasNext判断是否还有下一个,在用next()方法循环取出来
			 * */
			/*Iterator it = hs.iterator();
			if(it.hasNext())
			{
				Object obj = it.next();
				int num = 0;
				num = Integer.parseInt(hm.get(obj).toString());
				CartBean c = cart.GetShopCartInfo(obj.toString());
				CartBean cb = new CartBean();
				cb.setId(c.getId());
				cb.setName(c.getName());
				cb.setCount(num);
				cb.setPrice(c.getPrice());
				cartlist.add(cb);
			}*/
			for(int i = 0;i<obj.length;i++)
			{
				int num = 0;
				num = Integer.parseInt(hm.get(obj[i]).toString());
				CartBean c = cart.GetShopCartInfo(obj[i].toString());
				CartBean cb = new CartBean();
				cb.setId(c.getId());
				cb.setName(c.getName());
				cb.setCount(num);
				cb.setPrice(c.getPrice());
				cb.setTotalfee(num*(c.getPrice()));
				cartlist.add(cb);
			}
			double totalmoney = 0;
			for(int i = 0;i<cartlist.size();i++)
			{
				CartBean total = (CartBean)cartlist.get(i);
				totalmoney += total.getTotalfee();
			}
			session.setAttribute("totalmoney", totalmoney);
			session.setAttribute("cartlist", cartlist);
			RequestDispatcher dis = request.getRequestDispatcher("Jsp/Cart.jsp");
			dis.forward(request, response);
		}
		else
		{
			out.println("你还没有购买任何物品");
			out.println("<img src=\"Image/Go_Off.gif\" onclick=\"javascript:location.href='DisServlet'\" style='cursor: pointer'>");
			out.println();
		}
		out.flush();
		out.close();
	}

	
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		this.doGet(request, response);
	}

}