- 购物车删除操作
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1.1 页面剖析
1.2 编辑CartController
`/** * 购物车删除操作 * 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); }` - 京淘权限实现
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2.1 业务需要
当用户进行敏感操作时,必须要求用户先登录之后才能够拜访后端服务器. 例如京东商城…
应用技术:
1.AOP
2.拦截器 :拦挡用户的申请
2.2 定义京淘拦截器
2.2.1 SpringMVC调用原理图
2.2.2 SpringMVC拦截器工作原理
2.2.3 配置拦截器
`@Component //spring容器治理对象public class UserInterceptor implements HandlerInterceptor { @Autowired private JedisCluster jedisCluster; //Spring版本升级 4 必须实现所有的办法 spring 5 只须要重写指定的办法即可. /** * 需要: 拦挡/cart结尾的所有的申请进行拦挡.,并且校验用户是否登录..... * 拦截器抉择: preHandler * 如何判断用户是否登录: 1.查看cookie信息 2.查看Redis中是否有记录. * true : 申请应该放行 * false: 申请应该拦挡 则配合重定向的语法实现页面跳转到登录页面 使得程序流转起来 */ @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { //1.判断用户是否登录 查看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.动静获取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 动静获取UserId
2.3 ThreadLocal介绍
2.3.1 ThreadLocal作用
名称: 本地线程变量
作用: 能够在同一个线程内,实现数据的共享.
2.3.2 ThreadLocal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创立时追随线程. //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 动静获取UserId
3.京淘订单模块
3.1 订单表设计
3.2 创立订单我的项目
3.2.1 创立我的项目
3.2.2 增加继承依赖
`<!--2.增加依赖信息--> <dependencies> <!--依赖本质依赖的是jar包文件--> <dependency> <groupId>com.jt</groupId> <artifactId>jt-common</artifactId> <version>1.0-SNAPSHOT</version> </dependency> </dependencies> <!--3.增加插件--> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>` 3.2.3 增加POJO
删除orderItem的主键标识
3.2.4 构建jt-order我的项目
订单我的项目代码构造如下
3.3 订单确认页面跳转
3.3.1 url剖析
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.依据userId查问购物车信息 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 页面成果展示
3.4 对于SpringMVC参数提交问题阐明
3.4.1 简略参数传参问题
1.页面url标识
2.Controller中的办法
public void xxx(String name,int age){
`}` 3.4.2 应用对象办法接管参数
1.页面url标识
2.Controller中的办法
public void xxx(User user){
`}public class User{ private Integer name; private String age;}` 3.4.3 应用对象的援用为参数赋值
难点: 属性的重名提交问题…
解决思路: 能够采纳对象援用的形式为属性赋值.
`<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中的办法
`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 对于订单提交
3.5.1 页面URL阐明
3.5.2 申请参数
3.5.3 页面JS解析
`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("敬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 * 业务阐明: * 当订单入库之后,须要返回orderId.让用户查问. */ @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订单自身/order物流信息/order商品信息} * 难点: 操作3张表实现入库操作 * 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.实现订单入库 order.setOrderId(orderId).setStatus(1); orderMapper.insert(order); //3.实现订单物流入库 OrderShipping orderShipping = order.getOrderShipping(); orderShipping.setOrderId(orderId); orderShippingMapper.insert(orderShipping); //4.实现订单商品入库 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("订单入库胜利!!!!"); return orderId; }}` 3.6 订单胜利跳转
3.6.1 页面url剖析
3.6.2 编辑OrderController
`/** * 实现商品查问 * 1.url地址: http://www.jt.com/order/success.html?id=71603356409924 * 2.参数阐明: id 订单编号 * 3.返回值类型: success.html * 4.页面取值形式: ${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.查问订单信息 Order order = orderMapper.selectById(id); //2.查问订单物流信息 OrderShipping orderShipping = orderShippingMapper.selectById(id); //3.查问订单商品 QueryWrapper<OrderItem> queryWrapper = new QueryWrapper<>(); queryWrapper.eq("order_id",id); List<OrderItem> lists =orderItemMapper.selectList(queryWrapper); return order.setOrderItems(lists).setOrderShipping(orderShipping); }`