project12.rar.rar

package com.zhy.servlet; import com.zhy.entry.Book; import com.zhy.entry.Car; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import java.io.IOException; import java.util.HashMap; import java.util.List; import java.util.Map; @WebServlet("/carServlet") public class CarServlet extends HttpServlet { Map<String, Car> carMap= null; @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { HttpSession session = req.getSession(); List<Book> bookList = (List<Book>) session.getAttribute("bookList"); int id = Integer.parseInt(req.getParameter("id")); carMap = (Map<String, Car>) session.getAttribute("carMap"); if(carMap==null){ carMap=new HashMap<String, Car>(); Book book = bookList.get(id); Car car = new Car(); car.setBookName(book.getBookName()); car.setPrice(book.getPrice()); car.setCount(1); carMap.put(book.getId()+"",car); }else { if(carMap.get(id+"")!=null){ Car car = carMap.get(id+""); car.setCount(car.getCount()+1); carMap.put(id+"",car); }else { Book book = bookList.get(id); Car car = new Car(); car.setBookName(book.getBookName()); car.setPrice(book.getPrice()); car.setCount(1); carMap.put(book.getId()+"",car); } } session.setAttribute("carMap",carMap); resp.sendRedirect("jsp/car.jsp"); } }