testShooping.zip_Jsp商城购物车_testShooping_商城

package com.sp.serlvet; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.sp.model.*; public class ShoppingClServlet extends HttpServlet { /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); response.setCharacterEncoding("utf-8"); PrintWriter out = response.getWriter(); //得到type值，判断用户是要进行怎样的操作 String type=request.getParameter("type"); //解决多个购物车问题 //1.先试图从session中取出一个购车车 MyCartBO mbo=(MyCartBO)request.getSession().getAttribute("mycart"); if(mbo==null){ //说明该用户第一次购物 //创建一个购物车，并放入sesion mbo=new MyCartBO(); request.getSession().setAttribute("mycart", mbo); } if(type.equals("addGoods")){ //获得要购物的货物的id String goodsId=request.getParameter("goodsId"); //调用MyCartBO[购物车],完成购物 //MyCartBO mbo=new MyCartBO();//?????这样会造成有多个购物车!!![现在，我们必须想办法，保证始终只有一个购物车 ] [session???] //默认购买是1本书，以后可以修改 mbo.addGoods(goodsId, "1"); }else if(type.equals("delGoods")){ //得到要删除的货物的id String goodsId=request.getParameter("goodsId"); //从购物车中删除(从session中) mbo.delGoods(goodsId); }else if(type.equals("show")){ //do nothing }else if(type.equals("delAll")){ mbo.clear(); }else if(type.equals("updateGoods")){ //用户希望修改数量 //怎样在servlet中得到货物的id,和新的数量 //接收货物id String goodsId[]=request.getParameterValues("goodsId"); String newNums[]=request.getParameterValues("newNums"); //测试一下看看是否得到新的修改值 for(int i=0;i<goodsId.length;i++){ System.out.println("id==="+goodsId[i]+" 数量="+newNums[i]); //修改 mbo.upGoods(goodsId[i], newNums[i]); } } //把购物车的货物取出，准备在下一个页面显示 ArrayList al=mbo.showMyCart(); //放入到request request.setAttribute("mycartinfo", al); //跳转到 request.getRequestDispatcher("showMycart.jsp").forward(request, response); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } }