eclipse 开发的jsp购物车源代码，初学者好帮手

package com.buat.controller.shopping; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.HashMap; import javax.servlet.RequestDispatcher; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.buat.model.shoppingDAO.Products; import com.buat.model.shoppingDAO.shoppingDAO; import com.buat.pagination.*; public class shopping extends HttpServlet { private ServletConfig config = null; public shopping() { super(); } public void init(ServletConfig config) throws ServletException { super.init(config); this.config = config; } public void destroy() { super.destroy(); // Just puts "destroy" string in log } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String url = null; String operationType = null; operationType = request.getParameter("operationType"); if(operationType.equals("queryAllProducts")){ url = this.queryAllProducts(request, response); }else if(operationType.equals("buyProducts")){ url = this.buyProducts(request, response); } RequestDispatcher dispatcher = null; dispatcher = request.getRequestDispatcher(url); dispatcher.forward(request, response); } public void init() throws ServletException { } public String queryAllProducts(HttpServletRequest request, HttpServletResponse response){ String url = null; int [] resultForm = null; Products products = new Products(); shoppingDAO dao = new shoppingDAO(); ArrayList<Products> productsList = dao.queryAll(); resultForm = Pagination.getIndex(productsList); request.getSession().setAttribute("resultForm", resultForm); request.setAttribute("productsList",productsList); url = "/Shopping.jsp"; return url; } public String buyProducts(HttpServletRequest request, HttpServletResponse response){ String url = null; Products products [] = null; String id [] = request.getParameterValues("productId"); System.out.println("idLength: "+id.length); String[] productName = request.getParameterValues("productName"); String[] productPrice = request.getParameterValues("productPrice"); String[] willBuy = request.getParameterValues("willBuy"); if(id.length>0){ products = new Products[id.length]; for(int i =0;i<products.length;i++){ products[i]=new Products(Integer.parseInt(String.valueOf(id[i])),productName[i],productPrice[i],Integer.parseInt(String.valueOf(willBuy[i]))); System.out.println("id ["+i+"]="+id[i]); } ArrayList buyList = (ArrayList)request.getSession().getAttribute("buyList"); if(buyList!=null){ for(int i=0;i<buyList.size();i++){ Products p = (Products) buyList.get(i); for(int j=0;j<products.length;j++){ if(p.getId()==products[j].getId()){ ((Products) buyList.get(i)).setNumber(p.getNumber()+products[j].getNumber()); }else{ buyList.add(products[j]); } System.out.println("productsId "+((Products) buyList.get(i)).getId()+"'s"+" productsNumber is "+((Products) buyList.get(i)).getNumber()); } } }else{ buyList = new ArrayList(); for(int j=0;j<products.length;j++){ buyList.add(products[j]); } } request.getSession().setAttribute("buyList",buyList); } url = this.queryAllProducts(request, response); return url; } }