goodservlet.java

Java购物车及JSTL的应用

package org.qhit.li.store.servlet;

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

import javax.servlet.ServletContext;
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 org.qhit.li.store.dao.GoodsDAO;
import org.qhit.li.store.dto.GoodsDTO;

public class GoodServlet extends HttpServlet {

	
	/**
	 * 
	 */
	private static final long serialVersionUID = 2;

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

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

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		ServletContext appliction=getServletContext();
		HttpSession session=request.getSession();
		String action=request.getParameter("action");
		GoodsDAO dao=new GoodsDAO();
		
		//产品的所有规格
		session.removeAttribute("gtype");
		//前台展示的产品
		session.removeAttribute("adlist");
		//单个产品和所有产品
		session.removeAttribute("goodlist");
		//产品操作类
		session.removeAttribute("dao");
		
		session.removeAttribute("made");
		//得到后台要展示的首页产品ID
		String [] adGoods=(String[])appliction.getAttribute("pid");
		
		if(adGoods==null){
			adGoods=new  String[9];
			ArrayList<String> pid=dao.getpid();
			Iterator<String> iter=pid.iterator();
			for(int i=0;i<9;i++){
				if(iter.hasNext()){
					adGoods[i]=(String)iter.next();
				}
			}
		}
		
		ArrayList<GoodsDTO> adList=new ArrayList<GoodsDTO>();
		ArrayList<GoodsDTO> goodList=new ArrayList<GoodsDTO>();
		ArrayList<String> type=new ArrayList<String>();
		//查询展示产品的信息
		for(int i=0;i<adGoods.length;i++){
			GoodsDTO tempgood=dao.selectOneBook(adGoods[i]);
			adList.add(tempgood);
		}
		
		
		/*得到产品的各种规格*/
		type=dao.getType();
		
		session.setAttribute("gtype", type);
		
		session.setAttribute("adList", adList);
		
		/*单书的详细信息*/
		if(action!=null&&"detailed".equals(action)){
			String btid=request.getParameter("btid");
			String carde=request.getParameter("carde");
			btid=new String(btid.getBytes("iso-8859-1"),"gbk");
			GoodsDTO tempgood=dao.selectOneBook(btid);
			goodList.add(tempgood);
			session.setAttribute("goodlist",goodList);
			if(carde!=null&&"yes".equals(carde)){
				session.setAttribute("carde", btid);
				response.sendRedirect("./Stage/GoodCar.jsp");
				return;
			}
			response.sendRedirect("./Stage/GoodInfo.jsp");
			return;
		}
		
		/*用户买完物品后，再次购物 */
		if(action!=null&&"goto".equals(action)){
			session.removeAttribute("flag");
			session.removeAttribute("sum");
			session.removeAttribute("remark");
			session.removeAttribute("oid");
			session.removeAttribute("GoodsCar");
			session.removeAttribute("user");
		}
		
		/*得到当前页数*/
		int pageid=1;
		String getid=(String)request.getParameter("pageid");
		if(getid!=null){
			int tempid=Integer.valueOf(getid).intValue();
			pageid=tempid;
		}
		
		/*热卖商品*/
		if(action!=null&&"hot".equals(action)){
			goodList=dao.selectPopBooks(pageid);
			session.setAttribute("goodlist", goodList);
			session.setAttribute("dao", dao);
			session.setAttribute("made", "hot");
			response.sendRedirect("./Stage/Index.jsp");
			return;
		}
		
		/*精品推荐*/
		if(action!=null&&"commend".equals(action)){
			goodList=dao.selectCommend(pageid);
			session.setAttribute("goodlist", goodList);
			session.setAttribute("dao", dao);
			session.setAttribute("made", "commend");
			session.removeAttribute("stext");
			session.removeAttribute("abate");
			response.sendRedirect("./Stage/Index.jsp");
			return;
		}

		/*折扣商场*/
		if(action!=null&&"abate".equals(action)){
			goodList=dao.selectAbate(pageid);
			session.setAttribute("goodlist", goodList);
			session.setAttribute("dao", dao);
			session.setAttribute("abate", "yes");
			session.setAttribute("made", "abate");
			session.removeAttribute("stext");
			response.sendRedirect("./Stage/Index.jsp");
			return;
		}
		/*得到某个规格的商品*/
		if(action!=null&&"type".equals(action)){
			String  stype =(String)request.getParameter("stext");
			goodList=dao.selectByBtype(stype, pageid);
			session.setAttribute("goodlist", goodList);
			session.setAttribute("dao", dao);
			session.setAttribute("abate", "yes");
			session.setAttribute("made", "type");
			session.setAttribute("stext", stype);
			session.removeAttribute("abate");
			response.sendRedirect("./Stage/Index.jsp");
			return;
		}
		/*得到所有商品*/
		goodList=dao.selectBook(pageid);
		session.setAttribute("goodlist", goodList);
		session.setAttribute("dao", dao);
		
		response.sendRedirect("./Stage/Index.jsp");
		out.flush();
		out.close();
	}

}