首页 > 代码库 > 修改购物项图书数量的Ajax处理
修改购物项图书数量的Ajax处理
一、cart.jsp页面
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<base href=http://www.mamicode.com/"http://${pageContext.request.serverName }:${pageContext.request.serverPort }${pageContext.request.contextPath }/" />>
二、修改CartServlet
package com.atguigu.bookstore.servlet.client;
import com.atguigu.bookstore.bean.Book;
import com.atguigu.bookstore.fun.Cart;
import com.atguigu.bookstore.service.impl.BookServiceImpl;
import com.atguigu.bookstore.service.impl.CartServiceImpl;
import com.atguigu.bookstore.service.inter.BookService;
import com.atguigu.bookstore.service.inter.CartService;
import com.atguigu.bookstore.servlet.BaseServlet;
import com.atguigu.bookstore.utils.WebUtils;
import com.google.gson.Gson;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class CartServlet extends BaseServlet {
private static final long serialVersionUID = 1L;
CartService cartService=new CartServiceImpl();
BookService bookService=new BookServiceImpl();
protected void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("add....");
String bookid = request.getParameter("bookid");
Book book = bookService.getBookById(bookid);
Cart cart = WebUtils.getCart(request);
cartService.add(book, cart);
//要得到这样的数据{"bookName":"java", "totalCount": 2} 怎么得？
String bookName = book.getBookName();
int totalCount = cart.getTotalCount();
//使用Gson可以得到以上类型的数据,但是需要一个源，这个只有map和
//src是一个一般对象或map对象，在这里只能用map对象，因为如果是一般对象，所需要一个类中包含不了这2种属性，还得重新定义类，挺麻烦的
//而src是map对象时就不需要在重新定义类了，
Map<String, Object>map=new HashMap<String, Object>();
map.put("bookName", bookName); //取数据的时候是data.bookName;
map.put("totalCount", totalCount);
String jsonStr=new Gson().toJson(map);
response.setContentType("text/json;charset=utf-8");
response.getWriter().write(jsonStr);
}
protected void delete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("delete...");
String bookid = request.getParameter("bookid");
Cart cart = WebUtils.getCart(request);
cartService.deleteItem(Integer.parseInt(bookid), cart);
WebUtils.myForward(request, response, "/client/book/cart.jsp");
}
protected void update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("update....");
String count = request.getParameter("count");
String bookId = request.getParameter("bookId");
Map<String, Object>map=cartService.updateCount(Integer.parseInt(bookId),
Integer.parseInt(count), WebUtils.getCart(request));
// WebUtils.myForward(request, response, "/client/book/cart.jsp"); //不用这种方式了
//要返回的数据类型：{count:2,itemPrice:20,totalCount:5,totalPrice:50}，那么如何得到呢？可以更改updateCount方法，使其返回一个map集合
String json = new Gson().toJson(map);
response.setContentType("text/json;charset=utf-8");
response.getWriter().write(json);
}
protected void clear(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("clear....");
cartService.clear(WebUtils.getCart(request));
WebUtils.myForward(request, response, "/client/book/cart.jsp");
}
}
三、修改CartServiceImpl
<span style="white-space:pre"> </span>@Override
public Map<String, Object> updateCount(int BookId, int count, Cart cart) {
Map<String, Object>map=new HashMap<String, Object>();
CartItem cartItem = cart.getMap().get(BookId);
cartItem.setCount(count);
//{count:2,itemPrice:20,totalCount:5,totalPrice:50}，
map.put("count", count);
map.put("itemPrice", cartItem.getItemPrice());
map.put("totalCount", cart.getTotalCount());
map.put("totalPrice", cart.getTotalPrice());
return map;
}
修改购物项图书数量的Ajax处理
声明：以上内容来自用户投稿及互联网公开渠道收集整理发布，本网站不拥有所有权，未作人工编辑处理，也不承担相关法律责任，若内容有误或涉及侵权可进行投诉： 投诉/举报 工作人员会在5个工作日内联系你，一经查实，本站将立刻删除涉嫌侵权内容。