网上书城项目(hibernate-mysql)

package com.accp.shop.servlet; /** * 处理购物的功能 */ import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.accp.shop.dao.BookDao; import com.accp.shop.domain.Book; import com.accp.shop.impl.BookDaoImpl; public class ShoppingServlet extends HttpServlet { //创建购物车 MyCart cart; BookDao bookDao = new BookDaoImpl(); //通过用户来保存他的购物车 Map<String,MyCart> userMap = new HashMap<String, MyCart>(); @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req,resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String path = "shopping.jsp"; System.out.println("购物的sertvlet被执行了......"); //获得index.jsp页面你选择的复选框 String[] bookId = req.getParameterValues("bookId"); //获得操作的参数 String operate = req.getParameter("operate"); //1、2、3 //获得登录的用户名 String userName =(String)req.getSession().getAttribute("userName"); //通过用户名绑定一个购物车 getUserCart(userName); if(bookId!=null){ for (int i = 0; i < bookId.length; i++) { //把字符串的id转为int类型的id. int id = Integer.parseInt(bookId[i]); //通过ID来查询指定的图书 Book book = bookDao.getIdBook(id); //把选中的书，存入起来.(通过map集合进行保存) cart.addBook(id, book); } } if("del".equals(operate)){ //如果operate值是del，则进行删除 int id = Integer.parseInt(req.getParameter("id")); //通过id，删除指定的图书 cart.delBook(id); }else if("all".equals(operate)){ //清空购物车 cart.clearCart(); }else if("update".equals(operate)){ //修改 //获得页面中传递过来的ID int id = Integer.parseInt(req.getParameter("id")); //获得页面中传递过来的num int num = Integer.parseInt(req.getParameter("num")); cart.updateNumber(id, num); } //获得map集合 Map<Integer,Book> bookMap = cart.getMap(); //通过session保存map集合. req.getSession().setAttribute("bookMap", bookMap); //通过session保存人对应的购物车的集合. req.getSession().setAttribute("userMap", userMap); //获得总价格 double totalPrice = cart.getTotalPrice(); //保存总价格 req.getSession().setAttribute("totalPrice", totalPrice); //跳转到购物车的页面 resp.sendRedirect(path); } //通过用户名绑定一个购物车 public void getUserCart(String userName) { if(userMap.containsKey(userName)){ cart = userMap.get(userName); }else{ //为此人分配一个购物 cart = new MyCart(); //把人与购物车绑定到一块，放到userMap集合 userMap.put(userName, cart); } } }