购物车删除操做
1.1页面分析
1.2编辑CartController
/**
* 购物车删除操做
* url地址: http://www.jt.com/cart/delete/562379.html
* 参数: 获取itemId
* 返回值: 重定向到购物车的展示页面
*/
@RequestMapping("/delete/{itemId}")
public String deleteCarts(@PathVariable Long itemId){
Long userId = 7L;
cartService.deleteCarts(userId,itemId);
return "redirect:/cart/show.html";
}
1.3编辑CartService
@Override
public void deleteCarts(Long userId, Long itemId) {
QueryWrapper<Cart> queryWrapper = new QueryWrapper<>();
queryWrapper.eq("user_id", userId);
queryWrapper.eq("item_id", itemId);
cartMapper.delete(queryWrapper);
}
2.京淘权限实现
2.1业务需求
当用户进行敏感操做时,必需要求用户先登陆以后才能访问后端服务器.例如京东商城.
使用技术:
1.AOP 2.拦截器:拦截用户的请求
2.2定义京淘拦截器
2.2.1SpringMVC调用原理图
2.2.2SpringMVC拦截器工做原理
2.2.3配置拦截器
@Component //spring容器管理对象
public class UserInterceptor implements HandlerInterceptor {
@Autowired
private JedisCluster jedisCluster;
//Spring版本升级 4 必须实现全部的方法 spring 5 只须要重写指定的方法便可.
/**
* 需求: 拦截/cart开头的全部的请求进行拦截.,而且校验用户是否登陆.....
* 拦截器选择: preHandler
* 如何判断用户是否登陆: 1.检查cookie信息 2.检查Redis中是否有记录.
* true : 请求应该放行
* false: 请求应该拦截 则配合重定向的语法实现页面跳转到登陆页面 使得程序流转起来
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//1.判断用户是否登陆 检查cookie是否有值
String ticket = CookieUtil.getCookieValue(request,"JT_TICKET");
//2.校验ticket
if(!StringUtils.isEmpty(ticket)){
//3.判断redis中是否有值.
if(jedisCluster.exists(ticket)){
//4.动态获取json信息
String userJSON = jedisCluster.get(ticket);
User user = ObjectMapperUtil.toObj(userJSON,User.class);
request.setAttribute("JT_USER",user);
return true;
}
}
response.sendRedirect("/user/login.html");
return false;
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
//销毁数据
request.removeAttribute("JT_USER");
}
}
2.2.4获取动态UserId
2.3ThreadLocal介绍
2.3.1ThreadLocal做用
名称:本地线程变量
做用:能够在同一线程内,实现数据共享.
2.3.2ThreadLocal入门案例
private ThreadLocal<Integer> threadLocal = new ThreadLocal<>();
public void a(){
int a = 100;
threadLocal.set(a);
b();
}
public void b(){
int a = threadLocal.get();
int b = 100*a;
}
2.3.3编辑ThreadLocal工具API
public class UserThreadLocal {
//static不会影响影响线程 threadLocal建立时跟随线程.
//private static ThreadLocal<Map<k,v>> threadLocal = new ThreadLocal<>();
private static ThreadLocal<User> threadLocal = new ThreadLocal<>();
public static void set(User user){
threadLocal.set(user);
}
public static User get(){
return threadLocal.get();
}
public static void remove(){
threadLocal.remove();
}
}
2.3.4重构User拦截器
2.3.5动态获取UserId
京淘订单模块
3.1订单表设计
3.2建立订单项目
3.2.1建立项目
3.2.2添加继承依赖
<!--2.添加依赖信息-->
<dependencies>
<!--依赖实质依赖的是jar包文件-->
<dependency>
<groupId>com.jt</groupId>
<artifactId>jt-common</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
<!--3.添加插件-->
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
3.2.3添加POJO
删除orderItem的主键标识
3.2.4构建jt-order项目
订单项目代码结构以下
3.3订单确认页面跳转
3.3.1url分析
3.3.2编辑OrderController
package com.jt.controller;
import com.alibaba.dubbo.config.annotation.Reference;
import com.jt.pojo.Cart;
import com.jt.service.DubboCartService;
import com.jt.service.DubboOrderService;
import com.jt.thread.UserThreadLocal;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
@Controller
@RequestMapping("/order")
public class OrderController {
@Reference(timeout = 3000,check = false)
private DubboOrderService orderService;
@Reference(timeout = 3000,check = false)
private DubboCartService cartService;
/**
* 订单页面跳转
* url: http://www.jt.com/order/create.html
* 页面取值: ${carts}
*/
@RequestMapping("/create")
public String create(Model model){
//1.根据userId查询购物车信息
Long userId = UserThreadLocal.get().getId();
List<Cart> cartList = cartService.findCartListByUserId(userId);
model.addAttribute("carts",cartList);
return "order-cart";
}
}
3.3.3编辑OrderService
@Override
public List<Cart> findCartListByUserId(Long userId) {
QueryWrapper<Cart> queryWrapper = new QueryWrapper<>();
queryWrapper.eq("user_id", userId);
return cartMapper.selectList(queryWrapper);
}
3.3.4页面效果展示
3.4关于SpringMVC参数提交问题说明
3.4.1简单参数传参问题
1.页面url标识
2.Controller中的方法
public void xxx(String name,int age){
}
public class User{
private Integer name;
private String age;
}
3.4.3使用对象的引用为参数赋值
难点:属性的重名提交问题
解决思路:能够采用对象的引用方式为属性赋值
<input name="name" value="二郎神" />
<input name="age" value="3000" />
<input name="dog.name" value="哮天犬" />
<input name="dog.age" value="8000" />
2.Controller中的方法
public void xxx(User user){
}
public class Dog{
private String name;
private Integer age;
}
public class User{
private String name;
private Integer age;
private Dog dog;
}
3.5关于订单提交
3.5.1页面URL说明
3.5.2请求参数
3.5.3页面JS分析
jQuery.ajax( {
type : "POST",
dataType : "json",
url : "/order/submit",
data : $("#orderForm").serialize(),
// data: {"key":"value","key2":"value2".....}
// data: id=1&name="xxx"&age=18......
cache : false,
success : function(result) {
if(result.status == 200){
location.href = "/order/success.html?id="+result.data;
}else{
$("#submit_message").html("订单提交失败，请稍后重试...").show();
}
},
error : function(error) {
$("#submit_message").html("亲爱的用户请不要频繁点击, 请稍后重试...").show();
}
});
3.5.3编辑OrderController
/**
* 订单提交
* url: http://www.jt.com/order/submit
* 参数: 整个form表单
* 返回值: SysResult对象 携带返回值orderId
* 业务说明:
* 当订单入库以后,须要返回orderId.让用户查询.
*/
@RequestMapping("/submit")
@ResponseBody
public SysResult saveOrder(Order order){
Long userId = UserThreadLocal.get().getId();
order.setUserId(userId);
String orderId = orderService.saveOrder(order);
if(StringUtils.isEmpty(orderId))
return SysResult.fail();
else
return SysResult.success(orderId);
}
3.5.4编辑OrderService
@Service(timeout = 3000)
public class DubboOrderServiceImpl implements DubboOrderService {
@Autowired
private OrderMapper orderMapper;
@Autowired
private OrderItemMapper orderItemMapper;
@Autowired
private OrderShippingMapper orderShippingMapper;
/**
* Order{order订单自己/order物流信息/order商品信息}
* 难点: 操做3张表完成入库操做
* 主键信息: orderId
* @param order
* @return
*/
@Override
public String saveOrder(Order order) {
//1.拼接OrderId
String orderId =
"" + order.getUserId() + System.currentTimeMillis();
//2.完成订单入库
order.setOrderId(orderId).setStatus(1);
orderMapper.insert(order);
//3.完成订单物流入库
OrderShipping orderShipping = order.getOrderShipping();
orderShipping.setOrderId(orderId);
orderShippingMapper.insert(orderShipping);
//4.完成订单商品入库
List<OrderItem> orderItems = order.getOrderItems();
//批量入库 sql: insert into xxx(xxx,xx,xx)values (xx,xx,xx),(xx,xx,xx)....
for (OrderItem orderItem : orderItems){
orderItem.setOrderId(orderId);
orderItemMapper.insert(orderItem);
}
System.out.println("订单入库成功!!!!");
return orderId;
}
}
3.6订单成功跳转
3.6.1页面url分析
3.6.2编辑OrderController
/**
* 实现商品查询
* 1.url地址: http://www.jt.com/order/success.html?id=71603356409924
* 2.参数说明: id 订单编号
* 3.返回值类型: success.html
* 4.页面取值方式: ${order.orderId}
*/
@RequestMapping("/success")
public String findOrderById(String id,Model model){
Order order = orderService.findOrderById(id);
model.addAttribute("order",order);
return "success";
}
3.6.2编辑OrderService
@Override
public Order findOrderById(String id) {
//1.查询订单信息
Order order = orderMapper.selectById(id);
//2.查询订单物流信息
OrderShipping orderShipping = orderShippingMapper.selectById(id);
//3.查询订单商品
QueryWrapper<OrderItem> queryWrapper = new QueryWrapper<>();
queryWrapper.eq("order_id",id);
List<OrderItem> lists =orderItemMapper.selectList(queryWrapper);
return order.setOrderItems(lists).setOrderShipping(orderShipping);
}
3.6.3页面效果展示
4.项目结构图
