2022谷粒商城学习笔记（二十四）订单服务

前言

本系列博客基于B站谷粒商城，只作为本人学习总结使用。这里我会比较注重业务逻辑的编写和相关配置的流程。有问题可以评论或者联系我互相交流。原视频地址谷粒商城雷丰阳版。本人git仓库地址Draknessssw的谷粒商城

---

Springsession整合

pom依赖

		<!--redis-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>io.lettuce</groupId>
                    <artifactId>lettuce-core</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
        </dependency>

        <!--整合springsession，实现session共享-->
        <dependency>
            <groupId>org.springframework.session</groupId>
            <artifactId>spring-session-data-redis</artifactId>
        </dependency>

相关配置

spring.redis.host=192.168.75.129
spring.redis.port=6379

spring.session.store-type=redis

session名称配置

package com.xxxx.gulimall.order.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.session.web.http.CookieSerializer;
import org.springframework.session.web.http.DefaultCookieSerializer;



@Configuration
public class GulimallSessionConfig {

    @Bean
    public CookieSerializer cookieSerializer() {

        DefaultCookieSerializer cookieSerializer = new DefaultCookieSerializer();

        //放大作用域
        cookieSerializer.setDomainName("gulimall.com");
        cookieSerializer.setCookieName("GULISESSION");

        return cookieSerializer;
    }


    @Bean
    public RedisSerializer<Object> springSessionDefaultRedisSerializer() {
        return new GenericJackson2JsonRedisSerializer();
    }

}

主启动类加上注解

---

获取订单结算页面所需数据

@Autowired
    private OrderService orderService;

    /**
     * 去结算确认页
     * @param model
     * @param request
     * @return
     * @throws ExecutionException
     * @throws InterruptedException
     */
    @GetMapping(value = "/toTrade")
    public String toTrade(Model model, HttpServletRequest request) throws ExecutionException, InterruptedException {

        OrderConfirmVo confirmVo = orderService.confirmOrder();

        model.addAttribute("confirmOrderData",confirmVo);
        //展示订单确认的数据

        return "confirm";
    }

webMVC配置一个拦截器，当session中有登录用户信息再放行请求

package com.xxxx.gulimall.order.config;

import com.xxxx.gulimall.order.interceptor.LoginUserInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;



@Configuration
public class OrderWebConfig implements WebMvcConfigurer {

    @Autowired
    private LoginUserInterceptor loginUserInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(loginUserInterceptor).addPathPatterns("/**");
    }
}

拦截器

在前置拦截器方法中，获取请求uri。匹配一下是否有订单状态和去支付的请求。然后获取请求sessoin中用户的信息后往ThreadLocal中设置用户信息，否则给客户端发送一个跳转登录页的弹出框。

package com.xxxx.gulimall.order.interceptor;

import com.xxxx.common.vo.MemberResponseVo;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;

import static com.xxxx.common.constant.AuthServerConstant.LOGIN_USER;



@Component
public class LoginUserInterceptor implements HandlerInterceptor {

    public static ThreadLocal<MemberResponseVo> loginUser = new ThreadLocal<>();

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        String uri = request.getRequestURI();
        AntPathMatcher antPathMatcher = new AntPathMatcher();
        boolean match = antPathMatcher.match("/order/order/status/**", uri);
        boolean match1 = antPathMatcher.match("/payed/notify", uri);
        if (match || match1) {
            return true;
        }

        //获取登录的用户信息
        MemberResponseVo attribute = (MemberResponseVo) request.getSession().getAttribute(LOGIN_USER);

        if (attribute != null) {
            //把登录后用户的信息放在ThreadLocal里面进行保存
            loginUser.set(attribute);

            return true;
        } else {
            //未登录，返回登录页面
            response.setContentType("text/html;charset=UTF-8");
            PrintWriter out = response.getWriter();
            out.println("");
            // session.setAttribute("msg", "请先进行登录");
            // response.sendRedirect("http://auth.gulimall.com/login.html");
            return false;
        }
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

订单页Vo

package com.xxxx.gulimall.order.vo;

import lombok.Getter;
import lombok.Setter;

import java.math.BigDecimal;
import java.util.List;
import java.util.Map;



public class OrderConfirmVo {

    @Getter @Setter
    /** 会员收获地址列表 **/
    List<MemberAddressVo> memberAddressVos;

    @Getter @Setter
    /** 所有选中的购物项 **/
    List<OrderItemVo> items;

    /** 发票记录 **/
    @Getter @Setter
    /** 优惠券（会员积分） **/
    private Integer integration;

    /** 防止重复提交的令牌 **/
    @Getter @Setter
    private String orderToken;

    @Getter @Setter
    Map<Long,Boolean> stocks;

    public Integer getCount() {
        Integer count = 0;
        if (items != null && items.size() > 0) {
            for (OrderItemVo item : items) {
                count += item.getCount();
            }
        }
        return count;
    }


    /** 订单总额 **/
    //BigDecimal total;
    //计算订单总额
    public BigDecimal getTotal() {
        BigDecimal totalNum = BigDecimal.ZERO;
        if (items != null && items.size() > 0) {
            for (OrderItemVo item : items) {
                //计算当前商品的总价格
                BigDecimal itemPrice = item.getPrice().multiply(new BigDecimal(item.getCount().toString()));
                //再计算全部商品的总价格
                totalNum = totalNum.add(itemPrice);
            }
        }
        return totalNum;
    }


    /** 应付价格 **/
    //BigDecimal payPrice;
    public BigDecimal getPayPrice() {
        return getTotal();
    }
}

会员信息Vo

package com.xxxx.gulimall.order.vo;

import lombok.Data;



@Data
public class MemberAddressVo {

    private Long id;
    /**
     * member_id
     */
    private Long memberId;
    /**
     * 收货人姓名
     */
    private String name;
    /**
     * 电话
     */
    private String phone;
    /**
     * 邮政编码
     */
    private String postCode;
    /**
     * 省份/直辖市
     */
    private String province;
    /**
     * 城市
     */
    private String city;
    /**
     * 区
     */
    private String region;
    /**
     * 详细地址(街道)
     */
    private String detailAddress;
    /**
     * 省市区代码
     */
    private String areacode;
    /**
     * 是否默认
     */
    private Integer defaultStatus;

}

购物项Vo

package com.xxxx.gulimall.order.vo;

import lombok.Data;

import java.math.BigDecimal;
import java.util.List;



@Data
public class OrderItemVo {

    private Long skuId;

    private Boolean check;

    private String title;

    private String image;

    /**
     * 商品套餐属性
     */
    private List<String> skuAttrValues;

    private BigDecimal price;

    private Integer count;

    private BigDecimal totalPrice;

    /** 商品重量 **/
    private BigDecimal weight = new BigDecimal("0.085");
}

接着是实现类

获取ThreadLocal中当前用户登录信息，当前线程的请求头

		//构建OrderConfirmVo
        OrderConfirmVo confirmVo = new OrderConfirmVo();

        //获取当前用户登录的信息
        MemberResponseVo memberResponseVo = LoginUserInterceptor.loginUser.get();

        //TODO :获取当前线程请求头信息(解决Feign异步调用丢失请求头问题)
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();

这里订单服务调用远程接口存在请求头丢失的问题，原因是调用远程接口并不会自动装配cookie信息

配置拦截器对远程请求进行同步装配cookie信息

package com.xxxx.gulimall.order.config;

import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

/**
 * feign拦截器
 */

@Configuration
public class GuliFeignConfig {

    @Bean("requestInterceptor")
    public RequestInterceptor requestInterceptor() {

        RequestInterceptor requestInterceptor = new RequestInterceptor() {
            @Override
            public void apply(RequestTemplate template) {
                //1、使用RequestContextHolder拿到刚进来的请求数据
                ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();

                if (requestAttributes != null) {
                    //老请求
                    HttpServletRequest request = requestAttributes.getRequest();

                    if (request != null) {
                        //2、同步请求头的数据（主要是cookie）
                        //把老请求的cookie值放到新请求上来，进行一个同步
                        String cookie = request.getHeader("Cookie");
                        template.header("Cookie", cookie);
                    }
                }
            }
        };

        return requestInterceptor;
    }

}

接着在每一个线程共享请求数据

RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();

第一个异步任务，远程查询当前用户的收货地址

		CompletableFuture<Void> addressFuture = CompletableFuture.runAsync(() -> {

            //每一个线程都来共享之前的请求数据
            RequestContextHolder.setRequestAttributes(requestAttributes);

            //1、远程查询所有的收货地址列表
            List<MemberAddressVo> address = memberFeignService.getAddress(memberResponseVo.getId());
            confirmVo.setMemberAddressVos(address);
        }, threadPoolExecutor);

远程接口

package com.xxxx.gulimall.order.feign;

import com.xxxx.gulimall.order.vo.MemberAddressVo;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.List;



@FeignClient("gulimall-member")
public interface MemberFeignService {

    /**
     * 查询当前用户的全部收货地址
     * @param memberId
     * @return
     */
    @GetMapping(value = "/member/memberreceiveaddress/{memberId}/address")
    List<MemberAddressVo> getAddress(@PathVariable("memberId") Long memberId);
}

	@Override
    public List<MemberReceiveAddressEntity> getAddress(Long memberId) {

        List<MemberReceiveAddressEntity> addressList = this.baseMapper.selectList
                (new QueryWrapper<MemberReceiveAddressEntity>().eq("member_id", memberId));

        return addressList;
    }

第二个异步任务，查询购物车中的购物项，根据这些购物项再出查询相应的库存

//开启第二个异步任务
        CompletableFuture<Void> cartInfoFuture = CompletableFuture.runAsync(() -> {

            //每一个线程都来共享之前的请求数据
            RequestContextHolder.setRequestAttributes(requestAttributes);

            //2、远程查询购物车所有选中的购物项
            List<OrderItemVo> currentCartItems = cartFeignService.getCurrentCartItems();
            confirmVo.setItems(currentCartItems);
            //feign在远程调用之前要构造请求，调用很多的拦截器
        }, threadPoolExecutor).thenRunAsync(() -> {
            List<OrderItemVo> items = confirmVo.getItems();
            //获取全部商品的id
            List<Long> skuIds = items.stream()
                    .map((itemVo -> itemVo.getSkuId()))
                    .collect(Collectors.toList());

            //远程查询商品库存信息
            R skuHasStock = wmsFeignService.getSkuHasStock(skuIds);
            List<SkuStockVo> skuStockVos = skuHasStock.getData("data", new TypeReference<List<SkuStockVo>>() {});

            if (skuStockVos != null && skuStockVos.size() > 0) {
                //将skuStockVos集合转换为map
                Map<Long, Boolean> skuHasStockMap = skuStockVos.stream().collect(Collectors.toMap(SkuStockVo::getSkuId, SkuStockVo::getHasStock));
                confirmVo.setStocks(skuHasStockMap);
            }
        },threadPoolExecutor);

查询购物项的远程接口

package com.xxxx.gulimall.order.feign;

import com.xxxx.gulimall.order.vo.OrderItemVo;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;

import java.util.List;



@FeignClient("gulimall-cart")
public interface CartFeignService {

    /**
     * 查询当前用户购物车选中的商品项
     * @return
     */
    @GetMapping(value = "/currentUserCartItems")
    List<OrderItemVo> getCurrentCartItems();

}

	@Override
    public List<CartItemVo> getUserCartItems() {

        List<CartItemVo> cartItemVoList = new ArrayList<>();
        //获取当前用户登录的信息
        UserInfoTo userInfoTo = CartInterceptor.toThreadLocal.get();
        //如果用户未登录直接返回null
        if (userInfoTo.getUserId() == null) {
            return null;
        } else {
            //获取购物车项
            String cartKey = CART_PREFIX + userInfoTo.getUserId();
            //获取所有的
            List<CartItemVo> cartItems = getCartItems(cartKey);
            if (cartItems == null) {
                throw new CartExceptionHandler();
            }
            //筛选出选中的
            cartItemVoList = cartItems.stream()
                    .filter(items -> items.getCheck())
                    .map(item -> {
                        //更新为最新的价格（查询数据库）
                        BigDecimal price = productFeignService.getPrice(item.getSkuId());
                        item.setPrice(price);
                        return item;
                    })
                    .collect(Collectors.toList());
        }

        return cartItemVoList;
    }

    /**
     * 获取购物车里面的数据
     * @param cartKey
     * @return
     */
    private List<CartItemVo> getCartItems(String cartKey) {
        //获取购物车里面的所有商品
        BoundHashOperations<String, Object, Object> operations = redisTemplate.boundHashOps(cartKey);
        List<Object> values = operations.values();
        if (values != null && values.size() > 0) {
            List<CartItemVo> cartItemVoStream = values.stream().map((obj) -> {
                String str = (String) obj;
                CartItemVo cartItem = JSON.parseObject(str, CartItemVo.class);
                return cartItem;
            }).collect(Collectors.toList());
            return cartItemVoStream;
        }
        return null;

    }

商品的价格可能会有较大可能随时更新，所以得获取最新的。远程调用商品服务来查询

远程接口

@FeignClient("gulimall-product")
public interface ProductFeignService {
    /**
     * 根据skuId查询当前商品的最新价格
     * @param skuId
     * @return
     */
    @GetMapping(value = "/product/skuinfo/{skuId}/price")
    BigDecimal getPrice(@PathVariable("skuId") Long skuId);
 }

    @Autowired
    private SkuInfoService skuInfoService;

    /**
     * 根据skuId查询当前商品的价格
     * @param skuId
     * @return
     */
    @GetMapping(value = "/{skuId}/price")
    public BigDecimal getPrice(@PathVariable("skuId") Long skuId) {

        //获取当前商品的信息
        SkuInfoEntity skuInfo = skuInfoService.getById(skuId);

        //获取商品的价格
        BigDecimal price = skuInfo.getPrice();

        return price;
    }

查询商品库存的远程接口

@FeignClient("gulimall-ware")
public interface WmsFeignService {

    /**
     * 查询sku是否有库存
     * @return
     */
    @PostMapping(value = "/ware/waresku/hasStock")
    R getSkuHasStock(@RequestBody List<Long> skuIds);
}

接着设置积分和防重复令牌

		//3、查询用户积分
        Integer integration = memberResponseVo.getIntegration();
        confirmVo.setIntegration(integration);

        //4、价格数据自动计算

        //TODO 5、防重令牌(防止表单重复提交)
        //为用户设置一个token，三十分钟过期时间（存在redis）
        String token = UUID.randomUUID().toString().replace("-", "");
        redisTemplate.opsForValue().set(USER_ORDER_TOKEN_PREFIX+memberResponseVo.getId(),token,30, TimeUnit.MINUTES);
        confirmVo.setOrderToken(token);

最终效果如下

    /**
     * 订单确认页返回需要用的数据
     * @return
     */
    @Override
    public OrderConfirmVo confirmOrder() throws ExecutionException, InterruptedException {

        //构建OrderConfirmVo
        OrderConfirmVo confirmVo = new OrderConfirmVo();

        //获取当前用户登录的信息
        MemberResponseVo memberResponseVo = LoginUserInterceptor.loginUser.get();

        //TODO :获取当前线程请求头信息(解决Feign异步调用丢失请求头问题)
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();

        //开启第一个异步任务
        CompletableFuture<Void> addressFuture = CompletableFuture.runAsync(() -> {

            //每一个线程都来共享之前的请求数据
            RequestContextHolder.setRequestAttributes(requestAttributes);

            //1、远程查询所有的收货地址列表
            List<MemberAddressVo> address = memberFeignService.getAddress(memberResponseVo.getId());
            confirmVo.setMemberAddressVos(address);
        }, threadPoolExecutor);

        //开启第二个异步任务
        CompletableFuture<Void> cartInfoFuture = CompletableFuture.runAsync(() -> {

            //每一个线程都来共享之前的请求数据
            RequestContextHolder.setRequestAttributes(requestAttributes);

            //2、远程查询购物车所有选中的购物项
            List<OrderItemVo> currentCartItems = cartFeignService.getCurrentCartItems();
            confirmVo.setItems(currentCartItems);
            //feign在远程调用之前要构造请求，调用很多的拦截器
        }, threadPoolExecutor).thenRunAsync(() -> {
            List<OrderItemVo> items = confirmVo.getItems();
            //获取全部商品的id
            List<Long> skuIds = items.stream()
                    .map((itemVo -> itemVo.getSkuId()))
                    .collect(Collectors.toList());

            //远程查询商品库存信息
            R skuHasStock = wmsFeignService.getSkuHasStock(skuIds);
            List<SkuStockVo> skuStockVos = skuHasStock.getData("data", new TypeReference<List<SkuStockVo>>() {});

            if (skuStockVos != null && skuStockVos.size() > 0) {
                //将skuStockVos集合转换为map
                Map<Long, Boolean> skuHasStockMap = skuStockVos.stream().collect(Collectors.toMap(SkuStockVo::getSkuId, SkuStockVo::getHasStock));
                confirmVo.setStocks(skuHasStockMap);
            }
        },threadPoolExecutor);

        //3、查询用户积分
        Integer integration = memberResponseVo.getIntegration();
        confirmVo.setIntegration(integration);

        //4、价格数据自动计算

        //TODO 5、防重令牌(防止表单重复提交)
        //为用户设置一个token，三十分钟过期时间（存在redis）
        String token = UUID.randomUUID().toString().replace("-", "");
        redisTemplate.opsForValue().set(USER_ORDER_TOKEN_PREFIX+memberResponseVo.getId(),token,30, TimeUnit.MINUTES);
        confirmVo.setOrderToken(token);


        CompletableFuture.allOf(addressFuture,cartInfoFuture).get();

        return confirmVo;
    }

---

幂等性问题

幂等解决方案

---

订单提交

下单成功去往支付页面，下单失败则重定向到订单页面。

    /**
     * 下单功能
     * @param vo
     * @return
     */
    @PostMapping(value = "/submitOrder")
    public String submitOrder(OrderSubmitVo vo, Model model, RedirectAttributes attributes) {

        try {
            SubmitOrderResponseVo responseVo = orderService.submitOrder(vo);
            //下单成功来到支付选择页
            //下单失败回到订单确认页重新确定订单信息
            if (responseVo.getCode() == 0) {
                //成功
                model.addAttribute("submitOrderResp",responseVo);
                return "pay";
            } else {
                String msg = "下单失败";
                switch (responseVo.getCode()) {
                    case 1: msg += "令牌订单信息过期，请刷新再次提交"; break;
                    case 2: msg += "订单商品价格发生变化，请确认后再次提交"; break;
                    case 3: msg += "库存锁定失败，商品库存不足"; break;
                }
                attributes.addFlashAttribute("msg",msg);
                return "redirect:http://order.gulimall.com/toTrade";
            }
        } catch (Exception e) {
            if (e instanceof NoStockException) {
                String message = ((NoStockException)e).getMessage();
                attributes.addFlashAttribute("msg",message);
            }
            return "redirect:http://order.gulimall.com/toTrade";
        }
    }

订单提交的Vo

package com.xxxx.gulimall.order.vo;

import lombok.Data;

import java.math.BigDecimal;



@Data
public class OrderSubmitVo {

    /** 收获地址的id **/
    private Long addrId;

    /** 支付方式 **/
    private Integer payType;
    //无需提交要购买的商品，去购物车再获取一遍
    //优惠、发票

    /** 防重令牌 **/
    private String orderToken;

    /** 应付价格 **/
    private BigDecimal payPrice;

    /** 订单备注 **/
    private String remarks;

    //用户相关的信息，直接去session中取出即可
}

提交订单的响应Vo

package com.xxxx.gulimall.order.vo;

import com.xxxx.gulimall.order.entity.OrderEntity;
import lombok.Data;


@Data
public class SubmitOrderResponseVo {

    private OrderEntity order;

    /** 错误状态码 **/
    private Integer code;


}

实现类

首先暂且将请求提交的vo存到threadLocal里，从用户登录的拦截器设置的用户登录信息那里获取用户信息。

		confirmVoThreadLocal.set(vo);

        SubmitOrderResponseVo responseVo = new SubmitOrderResponseVo();
        //去创建、下订单、验令牌、验价格、锁定库存...

        //获取当前用户登录的信息
        MemberResponseVo memberResponseVo = LoginUserInterceptor.loginUser.get();
        responseVo.setCode(0);

验证令牌防止重复提交
lua脚本获取Redis中token和vo中的token比对，一致就删除Redis中的token，其他情况返回0
而Arrays.asList(USER_ORDER_TOKEN_PREFIX + memberResponseVo.getId())则是要验证的token中的key

		//1、验证令牌是否合法【令牌的对比和删除必须保证原子性】
        String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
        String orderToken = vo.getOrderToken();

        //通过lure脚本原子验证令牌和删除令牌
        Long result = redisTemplate.execute(new DefaultRedisScript<Long>(script, Long.class),
                Arrays.asList(USER_ORDER_TOKEN_PREFIX + memberResponseVo.getId()),
                orderToken);

如果token验证失败，则设置表单返回vo的状态码为1即可（Controller中状态码为1才设置显示表单数据），订单信息不用设置，直接返回。否则就去设置返回Vo的订单详情再返回。

		if (result == 0L) {
            //令牌验证失败
            responseVo.setCode(1);
            return responseVo;
        } else {
            //令牌验证成功
            //1、创建订单、订单项等信息

令牌验证成功，创建订单

 //令牌验证成功
            //1、创建订单、订单项等信息
            OrderCreateTo order = createOrder();

创建订单方法有三个业务方法

private OrderCreateTo createOrder() {

        OrderCreateTo createTo = new OrderCreateTo();

        //1、生成订单号
        String orderSn = IdWorker.getTimeId();
        //创建订单号
        OrderEntity orderEntity = builderOrder(orderSn);

        //2、获取到所有的订单项
        List<OrderItemEntity> orderItemEntities = builderOrderItems(orderSn);

        //3、验价(计算价格、积分等信息)
        computePrice(orderEntity,orderItemEntities);

        createTo.setOrder(orderEntity);
        createTo.setOrderItems(orderItemEntities);

        return createTo;
    }

1、构建订单数据的方法

    /**
     * 构建订单数据
     * @param orderSn
     * @return
     */
    private OrderEntity builderOrder(String orderSn) {

        //获取当前用户登录信息
        MemberResponseVo memberResponseVo = LoginUserInterceptor.loginUser.get();

        OrderEntity orderEntity = new OrderEntity();
        orderEntity.setMemberId(memberResponseVo.getId());
        orderEntity.setOrderSn(orderSn);
        orderEntity.setMemberUsername(memberResponseVo.getUsername());

        OrderSubmitVo orderSubmitVo = confirmVoThreadLocal.get();

        //远程获取收货地址和运费信息
        R fareAddressVo = wmsFeignService.getFare(orderSubmitVo.getAddrId());
        FareVo fareResp = fareAddressVo.getData("data", new TypeReference<FareVo>() {});

        //获取到运费信息
        BigDecimal fare = fareResp.getFare();
        orderEntity.setFreightAmount(fare);

        //获取到收货地址信息
        MemberAddressVo address = fareResp.getAddress();
        //设置收货人信息
        orderEntity.setReceiverName(address.getName());
        orderEntity.setReceiverPhone(address.getPhone());
        orderEntity.setReceiverPostCode(address.getPostCode());
        orderEntity.setReceiverProvince(address.getProvince());
        orderEntity.setReceiverCity(address.getCity());
        orderEntity.setReceiverRegion(address.getRegion());
        orderEntity.setReceiverDetailAddress(address.getDetailAddress());

        //设置订单相关的状态信息
        orderEntity.setStatus(OrderStatusEnum.CREATE_NEW.getCode());
        orderEntity.setAutoConfirmDay(7);
        orderEntity.setConfirmStatus(0);
        return orderEntity;
    }

其中，运费信息和地址信息需要远程调用库存服务来获取

 		//远程获取收货地址和运费信息
        R fareAddressVo = wmsFeignService.getFare(orderSubmitVo.getAddrId());
        FareVo fareResp = fareAddressVo.getData("data", new TypeReference<FareVo>() {});

运费和收货地址信息Vo

package com.xxxx.gulimall.order.vo;

import lombok.Data;

import java.math.BigDecimal;



@Data
public class FareVo {

    private MemberAddressVo address;

    private BigDecimal fare;

}

远程接口

@FeignClient("gulimall-ware")
public interface WmsFeignService {

    /**
     * 查询运费和收货地址信息
     * @param addrId
     * @return
     */
    @GetMapping(value = "/ware/wareinfo/fare")
    R getFare(@RequestParam("addrId") Long addrId);
}

    /**
     * 获取运费信息
     * @return
     */
    @GetMapping(value = "/fare")
    public R getFare(@RequestParam("addrId") Long addrId) {

        FareVo fare = wareInfoService.getFare(addrId);

        return R.ok().setData(fare);
    }

实现类

    /**
     * 计算运费
     * @param addrId
     * @return
     */
    @Override
    public FareVo getFare(Long addrId) {

        FareVo fareVo = new FareVo();

        //收获地址的详细信息
        R addrInfo = memberFeignService.info(addrId);

        MemberAddressVo memberAddressVo = addrInfo.getData("memberReceiveAddress",new TypeReference<MemberAddressVo>() {});

        if (memberAddressVo != null) {
            String phone = memberAddressVo.getPhone();
            //截取用户手机号码最后一位作为我们的运费计算
            //1558022051
            String fare = phone.substring(phone.length() - 10, phone.length()-8);
            BigDecimal bigDecimal = new BigDecimal(fare);

            fareVo.setFare(bigDecimal);
            fareVo.setAddress(memberAddressVo);

            return fareVo;
        }
        return null;
    }

这里又套娃去远程调用会员服务查询地址信息

远程接口

@FeignClient("gulimall-member")
public interface MemberFeignService {

    /**
     * 根据id获取用户地址信息
     * @param id
     * @return
     */
    @RequestMapping("/member/memberreceiveaddress/info/{id}")
    R info(@PathVariable("id") Long id);

}

    /**
     * 信息
     */
    @RequestMapping("/info/{id}")
    public R info(@PathVariable("id") Long id){
		MemberReceiveAddressEntity memberReceiveAddress = memberReceiveAddressService.getById(id);

        return R.ok().put("memberReceiveAddress", memberReceiveAddress);
    }

2、构建所有订单项数据

    /**
     * 构建所有订单项数据
     * @return
     */
    public List<OrderItemEntity> builderOrderItems(String orderSn) {

        List<OrderItemEntity> orderItemEntityList = new ArrayList<>();

        //最后确定每个购物项的价格
        List<OrderItemVo> currentCartItems = cartFeignService.getCurrentCartItems();
        if (currentCartItems != null && currentCartItems.size() > 0) {
            orderItemEntityList = currentCartItems.stream().map((items) -> {
                //构建订单项数据
                OrderItemEntity orderItemEntity = builderOrderItem(items);
                orderItemEntity.setOrderSn(orderSn);

                return orderItemEntity;
            }).collect(Collectors.toList());
        }

        return orderItemEntityList;
    }

商品项Vo

package com.xxxx.gulimall.order.vo;

import lombok.Data;

import java.math.BigDecimal;
import java.util.List;



@Data
public class OrderItemVo {

    private Long skuId;

    private Boolean check;

    private String title;

    private String image;

    /**
     * 商品套餐属性
     */
    private List<String> skuAttrValues;

    private BigDecimal price;

    private Integer count;

    private BigDecimal totalPrice;

    /** 商品重量 **/
    private BigDecimal weight = new BigDecimal("0.085");
}

获取当前购物车中的所有购物项远程接口

@FeignClient("gulimall-cart")
public interface CartFeignService {

    /**
     * 查询当前用户购物车选中的商品项
     * @return
     */
    @GetMapping(value = "/currentUserCartItems")
    List<OrderItemVo> getCurrentCartItems();

}

    @Autowired
    private CartService cartService;


    /**
     * 获取当前用户的购物车商品项
     * @return
     */
    @GetMapping(value = "/currentUserCartItems")
    @ResponseBody
    public List<CartItemVo> getCurrentCartItems() {

        List<CartItemVo> cartItemVoList = cartService.getUserCartItems();

        return cartItemVoList;
    }

    /**
     * 获取当前用户的购物车商品项
     * @return
     */
    @GetMapping(value = "/currentUserCartItems")
    @ResponseBody
    public List<CartItemVo> getCurrentCartItems() {

        List<CartItemVo> cartItemVoList = cartService.getUserCartItems();

        return cartItemVoList;
    }

实现类

	@Override
    public List<CartItemVo> getUserCartItems() {

        List<CartItemVo> cartItemVoList = new ArrayList<>();
        //获取当前用户登录的信息
        UserInfoTo userInfoTo = CartInterceptor.toThreadLocal.get();
        //如果用户未登录直接返回null
        if (userInfoTo.getUserId() == null) {
            return null;
        } else {
            //获取购物车项
            String cartKey = CART_PREFIX + userInfoTo.getUserId();
            //获取所有的
            List<CartItemVo> cartItems = getCartItems(cartKey);
            if (cartItems == null) {
                throw new CartExceptionHandler();
            }
            //筛选出选中的
            cartItemVoList = cartItems.stream()
                    .filter(items -> items.getCheck())
                    .map(item -> {
                        //更新为最新的价格（查询数据库）
                        BigDecimal price = productFeignService.getPrice(item.getSkuId());
                        item.setPrice(price);
                        return item;
                    })
                    .collect(Collectors.toList());
        }

        return cartItemVoList;
    }

其中，获取购物车里的数据

    /**
     * 获取购物车里面的数据
     * @param cartKey
     * @return
     */
    private List<CartItemVo> getCartItems(String cartKey) {
        //获取购物车里面的所有商品
        BoundHashOperations<String, Object, Object> operations = redisTemplate.boundHashOps(cartKey);
        List<Object> values = operations.values();
        if (values != null && values.size() > 0) {
            List<CartItemVo> cartItemVoStream = values.stream().map((obj) -> {
                String str = (String) obj;
                CartItemVo cartItem = JSON.parseObject(str, CartItemVo.class);
                return cartItem;
            }).collect(Collectors.toList());
            return cartItemVoStream;
        }
        return null;

    }

查询每一个购物项的价格
远程接口

    /**
     * 根据skuId查询当前商品的最新价格
     * @param skuId
     * @return
     */
    @GetMapping(value = "/product/skuinfo/{skuId}/price")
    BigDecimal getPrice(@PathVariable("skuId") Long skuId);

    /**
     * 根据skuId查询当前商品的价格
     * @param skuId
     * @return
     */
    @GetMapping(value = "/{skuId}/price")
    public BigDecimal getPrice(@PathVariable("skuId") Long skuId) {

        //获取当前商品的信息
        SkuInfoEntity skuInfo = skuInfoService.getById(skuId);

        //获取商品的价格
        BigDecimal price = skuInfo.getPrice();

        return price;
    }

接着回到构建所有订单项数据的方法，将获取的所有订单项封装重构

    /**
     * 构建某一个订单项的数据
     * @param items
     * @return
     */
    private OrderItemEntity builderOrderItem(OrderItemVo items) {

        OrderItemEntity orderItemEntity = new OrderItemEntity();

        //1、商品的spu信息
        Long skuId = items.getSkuId();
        //获取spu的信息
        R spuInfo = productFeignService.getSpuInfoBySkuId(skuId);
        SpuInfoVo spuInfoData = spuInfo.getData("data", new TypeReference<SpuInfoVo>() {
        });
        orderItemEntity.setSpuId(spuInfoData.getId());
        orderItemEntity.setSpuName(spuInfoData.getSpuName());
        orderItemEntity.setSpuBrand(spuInfoData.getBrandName());
        orderItemEntity.setCategoryId(spuInfoData.getCatalogId());

        //2、商品的sku信息
        orderItemEntity.setSkuId(skuId);
        orderItemEntity.setSkuName(items.getTitle());
        orderItemEntity.setSkuPic(items.getImage());
        orderItemEntity.setSkuPrice(items.getPrice());
        orderItemEntity.setSkuQuantity(items.getCount());

        //使用StringUtils.collectionToDelimitedString将list集合转换为String
        String skuAttrValues = StringUtils.collectionToDelimitedString(items.getSkuAttrValues(), ";");
        orderItemEntity.setSkuAttrsVals(skuAttrValues);

        //3、商品的优惠信息

        //4、商品的积分信息
        orderItemEntity.setGiftGrowth(items.getPrice().multiply(new BigDecimal(items.getCount())).intValue());
        orderItemEntity.setGiftIntegration(items.getPrice().multiply(new BigDecimal(items.getCount())).intValue());

        //5、订单项的价格信息
        orderItemEntity.setPromotionAmount(BigDecimal.ZERO);
        orderItemEntity.setCouponAmount(BigDecimal.ZERO);
        orderItemEntity.setIntegrationAmount(BigDecimal.ZERO);

        //当前订单项的实际金额.总额 - 各种优惠价格
        //原来的价格
        BigDecimal origin = orderItemEntity.getSkuPrice().multiply(new BigDecimal(orderItemEntity.getSkuQuantity().toString()));
        //原价减去优惠价得到最终的价格
        BigDecimal subtract = origin.subtract(orderItemEntity.getCouponAmount())
                .subtract(orderItemEntity.getPromotionAmount())
                .subtract(orderItemEntity.getIntegrationAmount());
        orderItemEntity.setRealAmount(subtract);

        return orderItemEntity;
    }

其中，获取商品集合的远程接口

@FeignClient("gulimall-product")
public interface ProductFeignService {

    /**
     * 根据skuId查询spu的信息
     * @param skuId
     * @return
     */
    @GetMapping(value = "/product/spuinfo/skuId/{skuId}")
    public R getSpuInfoBySkuId(@PathVariable("skuId") Long skuId);

}

    /**
     * 根据skuId查询spu的信息
     * @param skuId
     * @return
     */
    @GetMapping(value = "/skuId/{skuId}")
    public R getSpuInfoBySkuId(@PathVariable("skuId") Long skuId) {

        SpuInfoEntity spuInfoEntity = spuInfoService.getSpuInfoBySkuId(skuId);

        return R.ok().setData(spuInfoEntity);
    }

实现类

    /**
     * 根据skuId查询spu的信息
     * @param skuId
     * @return
     */
    @Override
    public SpuInfoEntity getSpuInfoBySkuId(Long skuId) {

        //先查询sku表里的数据
        SkuInfoEntity skuInfoEntity = skuInfoService.getById(skuId);

        //获得spuId
        Long spuId = skuInfoEntity.getSpuId();

        //再通过spuId查询spuInfo信息表里的数据
        SpuInfoEntity spuInfoEntity = this.baseMapper.selectById(spuId);

        //查询品牌表的数据获取品牌名
        BrandEntity brandEntity = brandService.getById(spuInfoEntity.getBrandId());
        spuInfoEntity.setBrandName(brandEntity.getName());

        return spuInfoEntity;
    }

3、计算价格和积分信息

    /**
     * 计算价格的方法
     * @param orderEntity
     * @param orderItemEntities
     */
    private void computePrice(OrderEntity orderEntity, List<OrderItemEntity> orderItemEntities) {

        //总价
        BigDecimal total = new BigDecimal("0.0");
        //优惠价
        BigDecimal coupon = new BigDecimal("0.0");
        BigDecimal intergration = new BigDecimal("0.0");
        BigDecimal promotion = new BigDecimal("0.0");

        //积分、成长值
        Integer integrationTotal = 0;
        Integer growthTotal = 0;

        //订单总额，叠加每一个订单项的总额信息
        for (OrderItemEntity orderItem : orderItemEntities) {
            //优惠价格信息
            coupon = coupon.add(orderItem.getCouponAmount());
            promotion = promotion.add(orderItem.getPromotionAmount());
            intergration = intergration.add(orderItem.getIntegrationAmount());

            //总价
            total = total.add(orderItem.getRealAmount());

            //积分信息和成长值信息
            integrationTotal += orderItem.getGiftIntegration();
            growthTotal += orderItem.getGiftGrowth();

        }
        //1、订单价格相关的
        orderEntity.setTotalAmount(total);
        //设置应付总额(总额+运费)
        orderEntity.setPayAmount(total.add(orderEntity.getFreightAmount()));
        orderEntity.setCouponAmount(coupon);
        orderEntity.setPromotionAmount(promotion);
        orderEntity.setIntegrationAmount(intergration);

        //设置积分成长值信息
        orderEntity.setIntegration(integrationTotal);
        orderEntity.setGrowth(growthTotal);

        //设置删除状态(0-未删除，1-已删除)
        orderEntity.setDeleteStatus(0);

    }

---

接着回到提交订单的方法
验证提交订单的价格和最新价格一致再保存订单，否则设置订单响应错误状态码

			//2、验证价格
            BigDecimal payAmount = order.getOrder().getPayAmount();
            BigDecimal payPrice = vo.getPayPrice();

            if (Math.abs(payAmount.subtract(payPrice).doubleValue()) < 0.01) {
                //金额对比
                //TODO 3、保存订单
                saveOrder(order);
             else {
                responseVo.setCode(2);
                return responseVo;
            }

    /**
     * 保存订单所有数据
     * @param orderCreateTo
     */
    private void saveOrder(OrderCreateTo orderCreateTo) {

        //获取订单信息
        OrderEntity order = orderCreateTo.getOrder();
        order.setModifyTime(new Date());
        order.setCreateTime(new Date());
        //保存订单
        this.baseMapper.insert(order);

        //获取订单项信息
        List<OrderItemEntity> orderItems = orderCreateTo.getOrderItems();
        //批量保存订单项数据
        orderItemService.saveBatch(orderItems);
    }

接着是锁定库存

锁定库存的Vo

package com.xxxx.gulimall.order.vo;

import lombok.Data;

import java.util.List;



@Data
public class WareSkuLockVo {

    private String orderSn;

    /** 需要锁住的所有库存信息 **/
    private List<OrderItemVo> locks;



}

重新封装要锁定的商品信息，调用远程服务锁定库存

				//4、库存锁定,只要有异常，回滚订单数据
                //订单号、所有订单项信息(skuId,skuNum,skuName)
                WareSkuLockVo lockVo = new WareSkuLockVo();
                lockVo.setOrderSn(order.getOrder().getOrderSn());

                //获取出要锁定的商品数据信息
                List<OrderItemVo> orderItemVos = order.getOrderItems().stream().map((item) -> {
                    OrderItemVo orderItemVo = new OrderItemVo();
                    orderItemVo.setSkuId(item.getSkuId());
                    orderItemVo.setCount(item.getSkuQuantity());
                    orderItemVo.setTitle(item.getSkuName());
                    return orderItemVo;
                }).collect(Collectors.toList());
                lockVo.setLocks(orderItemVos);

                //TODO 调用远程锁定库存的方法
                //出现的问题：扣减库存成功了，但是由于网络原因超时，出现异常，导致订单事务回滚，库存事务不回滚(解决方案：seata)
                //为了保证高并发，不推荐使用seata，因为是加锁，并行化，提升不了效率,可以发消息给库存服务
                R r = wmsFeignService.orderLockStock(lockVo);

远程接口

@FeignClient("gulimall-ware")
public interface WmsFeignService {
    /**
     * 锁定库存
     * @param vo
     * @return
     */
    @PostMapping(value = "/ware/waresku/lock/order")
    R orderLockStock(@RequestBody WareSkuLockVo vo);
}

尝试去锁定库存，锁定失败就返回一个错误信息

    /**
     * 锁定库存
     * @param vo
     *
     * 库存解锁的场景
     *      1）、下订单成功，订单过期没有支付被系统自动取消或者被用户手动取消，都要解锁库存
     *      2）、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。之前锁定的库存就要自动解锁
     *      3）、
     *
     * @return
     */
    @PostMapping(value = "/lock/order")
    public R orderLockStock(@RequestBody WareSkuLockVo vo) {

        try {
            boolean lockStock = wareSkuService.orderLockStock(vo);
            return R.ok().setData(lockStock);
        } catch (NoStockException e) {
            return R.error(NO_STOCK_EXCEPTION.getCode(),NO_STOCK_EXCEPTION.getMessage());
        }
    }

实现类

首先保存库存单信息

        /**
         * 保存库存工作单详情信息
         * 追溯
         */
        WareOrderTaskEntity wareOrderTaskEntity = new WareOrderTaskEntity();
        wareOrderTaskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskEntity.setCreateTime(new Date());
        wareOrderTaskService.save(wareOrderTaskEntity);

查找商品库存信息，找到每个商品在哪个仓库都有库存

 //1、按照下单的收货地址，找到一个就近仓库，锁定库存
        //2、找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();

        List<SkuWareHasStock> collect = locks.stream().map((item) -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪个仓库有库存
            List<Long> wareIdList = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIdList);

            return stock;
        }).collect(Collectors.toList());

锁定库存时，没有任何仓库有这个商品的库存就抛出一个自定义没有库存的异常

		//2、锁定库存
        for (SkuWareHasStock hasStock : collect) {
            boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();

            if (org.springframework.util.StringUtils.isEmpty(wareIds)) {
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }

package com.xxxx.common.exception;

import lombok.Getter;
import lombok.Setter;



public class NoStockException extends RuntimeException {

    @Getter @Setter
    private Long skuId;

    public NoStockException(Long skuId) {
        super("商品id："+ skuId + "库存不足！");
    }

    public NoStockException(String msg) {
        super(msg);
    }


}

而锁定库存操作成功，也就是锁定库存的影响行数为1。则保存锁定库存信息和锁定库存详细信息到库存工作单详情当中
接着告诉MQ库存锁定成功

			//1、如果每一个商品都锁定成功,将当前商品锁定了几件的工作单记录发给MQ
            //2、锁定失败。前面保存的工作单信息都回滚了。发送出去的消息，即使要解锁库存，由于在数据库查不到指定的id，所有就不用解锁
            for (Long wareId : wareIds) {
                //锁定成功就返回1，失败就返回0
                Long count = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                if (count == 1) {
                    skuStocked = true;
                    WareOrderTaskDetailEntity taskDetailEntity = WareOrderTaskDetailEntity.builder()
                            .skuId(skuId)
                            .skuName("")
                            .skuNum(hasStock.getNum())
                            .taskId(wareOrderTaskEntity.getId())
                            .wareId(wareId)
                            .lockStatus(1)
                            .build();
                    wareOrderTaskDetailService.save(taskDetailEntity);
                    //TODO 告诉MQ库存锁定成功
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(wareOrderTaskEntity.getId());
                    StockDetailTo detailTo = new StockDetailTo();
                    BeanUtils.copyProperties(taskDetailEntity,detailTo);
                    lockedTo.setDetailTo(detailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;

sql

	<update id="lockSkuStock">
        UPDATE wms_ware_sku
        SET stock_locked = stock_locked + #{num}
        WHERE
            sku_id = #{skuId}
          AND ware_id = #{wareId}
          AND stock - stock_locked > 0
    </update>

---

这里为什么要使用ＭＱ？

假使因为网络问题导致库存在提交订单时扣除成功，但是订单取消……

所以，这里使用延时队列来实现订单库存信息的锁定

结合死信路由

但是结合一个服务一个交换机的设计原则，延时队列过期，应当返回给交换机，交换机再转给死信队列即可。

创建上述队列和路由组件

死信队列
需要特殊设置死信路由key和交换机和ttl

    /* 容器中的Queue、Exchange、Binding 会自动创建（在RabbitMQ）不存在的情况下 */

    /**
     * 死信队列
     *
     * @return
     */
    @Bean
    public Queue orderDelayQueue() {
        /*
            Queue(String name,  队列名字
            boolean durable,  是否持久化
            boolean exclusive,  是否排他
            boolean autoDelete, 是否自动删除
            Map arguments) 属性
         */
        HashMap<String, Object> arguments = new HashMap<>();
        arguments.put("x-dead-letter-exchange", "order-event-exchange");
        arguments.put("x-dead-letter-routing-key", "order.release.order");
        arguments.put("x-message-ttl", 60000); // 消息过期时间 1分钟
        Queue queue = new Queue("order.delay.queue", true, false, false, arguments);

        return queue;
    }

普通队列

    /**
     * 普通队列处理订单
     *
     * @return
     */
    @Bean
    public Queue orderReleaseQueue() {

        Queue queue = new Queue("order.release.order.queue", true, false, false);

        return queue;
    }

创建路由

    /**
     * TopicExchange
     *
     * @return
     */
    @Bean
    public Exchange orderEventExchange() {
        /*
         *   String name,
         *   boolean durable,
         *   boolean autoDelete,
         *   Map arguments
         * */
        return new TopicExchange("order-event-exchange", true, false);

    }

三段绑定关系

@Bean
    public Binding orderCreateBinding() {
        /*
         * String destination, 目的地（队列名或者交换机名字）
         * DestinationType destinationType, 目的地类型（Queue、Exhcange）
         * String exchange,
         * String routingKey,
         * Map arguments
         * */
        return new Binding("order.delay.queue",
                Binding.DestinationType.QUEUE,
                "order-event-exchange",
                "order.create.order",
                null);
    }

    @Bean
    public Binding orderReleaseBinding() {

        return new Binding("order.release.order.queue",
                Binding.DestinationType.QUEUE,
                "order-event-exchange",
                "order.release.order",
                null);
    }

    /**
     * 订单释放直接和库存释放进行绑定
     * @return
     */
    @Bean
    public Binding orderReleaseOtherBinding() {

        return new Binding("stock.release.stock.queue",
                Binding.DestinationType.QUEUE,
                "order-event-exchange",
                "order.release.other.#",
                null);
    }

最后实现

package com.xxxx.gulimall.order.config;

import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.Exchange;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.core.TopicExchange;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.HashMap;




@Configuration
public class MyRabbitMQConfig {

    /* 容器中的Queue、Exchange、Binding 会自动创建（在RabbitMQ）不存在的情况下 */

    /**
     * 死信队列
     *
     * @return
     */
    @Bean
    public Queue orderDelayQueue() {
        /*
            Queue(String name,  队列名字
            boolean durable,  是否持久化
            boolean exclusive,  是否排他
            boolean autoDelete, 是否自动删除
            Map arguments) 属性
         */
        HashMap<String, Object> arguments = new HashMap<>();
        arguments.put("x-dead-letter-exchange", "order-event-exchange");
        arguments.put("x-dead-letter-routing-key", "order.release.order");
        arguments.put("x-message-ttl", 60000); // 消息过期时间 1分钟
        Queue queue = new Queue("order.delay.queue", true, false, false, arguments);

        return queue;
    }

    /**
     * 普通队列处理订单
     *
     * @return
     */
    @Bean
    public Queue orderReleaseQueue() {

        Queue queue = new Queue("order.release.order.queue", true, false, false);

        return queue;
    }

    /**
     * TopicExchange
     *
     * @return
     */
    @Bean
    public Exchange orderEventExchange() {
        /*
         *   String name,
         *   boolean durable,
         *   boolean autoDelete,
         *   Map arguments
         * */
        return new TopicExchange("order-event-exchange", true, false);

    }


    @Bean
    public Binding orderCreateBinding() {
        /*
         * String destination, 目的地（队列名或者交换机名字）
         * DestinationType destinationType, 目的地类型（Queue、Exhcange）
         * String exchange,
         * String routingKey,
         * Map arguments
         * */
        return new Binding("order.delay.queue",
                Binding.DestinationType.QUEUE,
                "order-event-exchange",
                "order.create.order",
                null);
    }

    @Bean
    public Binding orderReleaseBinding() {

        return new Binding("order.release.order.queue",
                Binding.DestinationType.QUEUE,
                "order-event-exchange",
                "order.release.order",
                null);
    }

    /**
     * 订单释放直接和库存释放进行绑定
     * @return
     */
    @Bean
    public Binding orderReleaseOtherBinding() {

        return new Binding("stock.release.stock.queue",
                Binding.DestinationType.QUEUE,
                "order-event-exchange",
                "order.release.other.#",
                null);
    }
}

---

最终效果

    /**
     * 为某个订单锁定库存
     * @param vo
     * @return
     */
    @Transactional
    @Override
    public boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单详情信息
         * 追溯
         */
        WareOrderTaskEntity wareOrderTaskEntity = new WareOrderTaskEntity();
        wareOrderTaskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskEntity.setCreateTime(new Date());
        wareOrderTaskService.save(wareOrderTaskEntity);


        //1、按照下单的收货地址，找到一个就近仓库，锁定库存
        //2、找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();

        List<SkuWareHasStock> collect = locks.stream().map((item) -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪个仓库有库存
            List<Long> wareIdList = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIdList);

            return stock;
        }).collect(Collectors.toList());

        //2、锁定库存
        for (SkuWareHasStock hasStock : collect) {
            boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();

            if (org.springframework.util.StringUtils.isEmpty(wareIds)) {
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }

            //1、如果每一个商品都锁定成功,将当前商品锁定了几件的工作单记录发给MQ
            //2、锁定失败。前面保存的工作单信息都回滚了。发送出去的消息，即使要解锁库存，由于在数据库查不到指定的id，所有就不用解锁
            for (Long wareId : wareIds) {
                //锁定成功就返回1，失败就返回0
                Long count = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                if (count == 1) {
                    skuStocked = true;
                    WareOrderTaskDetailEntity taskDetailEntity = WareOrderTaskDetailEntity.builder()
                            .skuId(skuId)
                            .skuName("")
                            .skuNum(hasStock.getNum())
                            .taskId(wareOrderTaskEntity.getId())
                            .wareId(wareId)
                            .lockStatus(1)
                            .build();
                    wareOrderTaskDetailService.save(taskDetailEntity);

                    //TODO 告诉MQ库存锁定成功
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(wareOrderTaskEntity.getId());
                    StockDetailTo detailTo = new StockDetailTo();
                    BeanUtils.copyProperties(taskDetailEntity,detailTo);
                    lockedTo.setDetailTo(detailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                } else {
                    //当前仓库锁失败，重试下一个仓库
                }
            }

            if (skuStocked == false) {
                //当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }

        //3、肯定全部都是锁定成功的
        return true;
    }

---

解锁库存

依赖

		<!--amqp高级消息队列协议，rabbitmq实现-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>

主启动类添加注解

配置

spring:
  rabbitmq:
    host: 192.168.75.129
    port: 5672
    # 虚拟主机
    virtual-host: /

首先新建mq组件

package com.xxxx.gulimall.ware.config;

import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.Exchange;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.core.TopicExchange;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.amqp.support.converter.MessageConverter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.HashMap;



@Configuration
public class MyRabbitMQConfig {

    /**
     * 使用JSON序列化机制，进行消息转换
     * @return
     */
    @Bean
    public MessageConverter messageConverter() {
        return new Jackson2JsonMessageConverter();
    }

    // @RabbitListener(queues = "stock.release.stock.queue")
    // public void handle(Message message) {
    //
    // }

    /**
     * 库存服务默认的交换机
     * @return
     */
    @Bean
    public Exchange stockEventExchange() {
        //String name, boolean durable, boolean autoDelete, Map arguments
        TopicExchange topicExchange = new TopicExchange("stock-event-exchange", true, false);
        return topicExchange;
    }

    /**
     * 普通队列
     * @return
     */
    @Bean
    public Queue stockReleaseStockQueue() {
        //String name, boolean durable, boolean exclusive, boolean autoDelete, Map arguments
        Queue queue = new Queue("stock.release.stock.queue", true, false, false);
        return queue;
    }


    /**
     * 延迟队列
     * @return
     */
    @Bean
    public Queue stockDelay() {

        HashMap<String, Object> arguments = new HashMap<>();
        arguments.put("x-dead-letter-exchange", "stock-event-exchange");
        arguments.put("x-dead-letter-routing-key", "stock.release");
        // 消息过期时间 2分钟
        arguments.put("x-message-ttl", 120000);

        Queue queue = new Queue("stock.delay.queue", true, false, false,arguments);
        return queue;
    }


    /**
     * 交换机与普通队列绑定
     * @return
     */
    @Bean
    public Binding stockLocked() {
        //String destination, DestinationType destinationType, String exchange, String routingKey,
        // 			Map arguments
        Binding binding = new Binding("stock.release.stock.queue",
                Binding.DestinationType.QUEUE,
                "stock-event-exchange",
                "stock.release.#",
                null);

        return binding;
    }


    /**
     * 交换机与延迟队列绑定
     * @return
     */
    @Bean
    public Binding stockLockedBinding() {
        return new Binding("stock.delay.queue",
                Binding.DestinationType.QUEUE,
                "stock-event-exchange",
                "stock.locked",
                null);
    }


}

解锁库存的两种情况

写个监听器监听锁定库存时存入锁定库存信息的队列

第一种是业务失败，订单提交了，但是后续业务处理失败，解锁库存。
第二种是订单取消了，解锁库存

package com.xxxx.gulimall.ware.listener;

import com.rabbitmq.client.Channel;
import com.xxxx.common.to.OrderTo;
import com.xxxx.common.to.mq.StockLockedTo;
import com.xxxx.gulimall.ware.service.WareSkuService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;



@Slf4j
@RabbitListener(queues = "stock.release.stock.queue")
@Service
public class StockReleaseListener {

    @Autowired
    private WareSkuService wareSkuService;

    /**
     * 1、库存自动解锁
     *  下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。之前锁定的库存就要自动解锁
     *
     *  2、订单失败
     *      库存锁定失败
     *
     *   只要解锁库存的消息失败，一定要告诉服务解锁失败
     */
    @RabbitHandler
    public void handleStockLockedRelease(StockLockedTo to, Message message, Channel channel) throws IOException {
        log.info("******收到解锁库存的信息******");
        try {

            //当前消息是否被第二次及以后（重新）派发过来了
            // Boolean redelivered = message.getMessageProperties().getRedelivered();

            //解锁库存
            wareSkuService.unlockStock(to);
            // 手动删除消息
            channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
        } catch (Exception e) {
            // 解锁失败 将消息重新放回队列，让别人消费
            channel.basicReject(message.getMessageProperties().getDeliveryTag(),true);
        }
    }

    @RabbitHandler
    public void handleOrderCloseRelease(OrderTo orderTo, Message message, Channel channel) throws IOException {

        log.info("******收到订单关闭，准备解锁库存的信息******");

        try {
            wareSkuService.unlockStock(orderTo);
            // 手动删除消息
            channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
        } catch (Exception e) {
            // 解锁失败 将消息重新放回队列，让别人消费
            channel.basicReject(message.getMessageProperties().getDeliveryTag(),true);
        }
    }


}

1、当订单业务提交后回滚：

需要远程查询订单状态再调用解锁方法

远程接口

package com.xxxx.gulimall.ware.feign;

import com.xxxx.common.utils.R;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;



@FeignClient("gulimall-order")
public interface OrderFeignService {

    @GetMapping(value = "/order/order/status/{orderSn}")
    R getOrderStatus(@PathVariable("orderSn") String orderSn);

}

    /**
     * 根据订单编号查询订单状态
     * @param orderSn
     * @return
     */
    @GetMapping(value = "/status/{orderSn}")
    public R getOrderStatus(@PathVariable("orderSn") String orderSn) {
        OrderEntity orderEntity = orderService.getOrderByOrderSn(orderSn);
        return R.ok().setData(orderEntity);
    }

    /**
     * 根据订单编号查询订单状态
     * @param orderSn
     * @return
     */
    @GetMapping(value = "/status/{orderSn}")
    public R getOrderStatus(@PathVariable("orderSn") String orderSn) {
        OrderEntity orderEntity = orderService.getOrderByOrderSn(orderSn);
        return R.ok().setData(orderEntity);
    }

    /**
     * 按照订单号获取订单信息
     * @param orderSn
     * @return
     */
    @Override
    public OrderEntity getOrderByOrderSn(String orderSn) {

        OrderEntity orderEntity = this.baseMapper.selectOne(new QueryWrapper<OrderEntity>().eq("order_sn", orderSn));

        return orderEntity;
    }

最终效果

	@Override
    public void unlockStock(StockLockedTo to) {
        //库存工作单的id
        StockDetailTo detail = to.getDetailTo();
        Long detailId = detail.getId();

        /**
         * 解锁
         * 1、查询数据库关于这个订单锁定库存信息
         *   有：证明库存锁定成功了
         *      解锁：订单状况
         *          1、没有这个订单，必须解锁库存
         *          2、有这个订单，不一定解锁库存
         *              订单状态：已取消：解锁库存
         *                      已支付：不能解锁库存
         */
        WareOrderTaskDetailEntity taskDetailInfo = wareOrderTaskDetailService.getById(detailId);
        if (taskDetailInfo != null) {
            //查出wms_ware_order_task工作单的信息
            Long id = to.getId();
            WareOrderTaskEntity orderTaskInfo = wareOrderTaskService.getById(id);
            //获取订单号查询订单状态
            String orderSn = orderTaskInfo.getOrderSn();
            //远程查询订单信息
            R orderData = orderFeignService.getOrderStatus(orderSn);
            if (orderData.getCode() == 0) {
                //订单数据返回成功
                OrderVo orderInfo = orderData.getData("data", new TypeReference<OrderVo>() {});

                //判断订单状态是否已取消或者支付或者订单不存在
                if (orderInfo == null || orderInfo.getStatus() == 4) {
                    //订单已被取消，才能解锁库存
                    if (taskDetailInfo.getLockStatus() == 1) {
                        //当前库存工作单详情状态1，已锁定，但是未解锁才可以解锁
                        unLockStock(detail.getSkuId(),detail.getWareId(),detail.getSkuNum(),detailId);
                    }
                }
            } else {
                //消息拒绝以后重新放在队列里面，让别人继续消费解锁
                //远程调用服务失败
                throw new RuntimeException("远程调用服务失败");
            }
        } else {
            //无需解锁
        }
    }

2、订单取消解锁库存

实现类

    /**
     * 防止订单服务卡顿，导致订单状态消息一直改不了，库存优先到期，查订单状态新建，什么都不处理
     * 导致卡顿的订单，永远都不能解锁库存
     * @param orderTo
     */
    @Transactional(rollbackFor = Exception.class)
    @Override
    public void unlockStock(OrderTo orderTo) {

        String orderSn = orderTo.getOrderSn();
        //查一下最新的库存解锁状态，防止重复解锁库存
        WareOrderTaskEntity orderTaskEntity = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);

        //按照工作单的id找到所有 没有解锁的库存，进行解锁
        Long id = orderTaskEntity.getId();
        List<WareOrderTaskDetailEntity> list = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id).eq("lock_status", 1));

        for (WareOrderTaskDetailEntity taskDetailEntity : list) {
            unLockStock(taskDetailEntity.getSkuId(),
                    taskDetailEntity.getWareId(),
                    taskDetailEntity.getSkuNum(),
                    taskDetailEntity.getId());
        }

    }

最后是这两个解锁库存方式都调用的解锁方法

    /**
     * 解锁库存的方法
     * @param skuId
     * @param wareId
     * @param num
     * @param taskDetailId
     */
    public void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId) {

        //库存解锁
        wareSkuDao.unLockStock(skuId,wareId,num);

        //更新工作单的状态
        WareOrderTaskDetailEntity taskDetailEntity = new WareOrderTaskDetailEntity();
        taskDetailEntity.setId(taskDetailId);
        //变为已解锁
        taskDetailEntity.setLockStatus(2);
        wareOrderTaskDetailService.updateById(taskDetailEntity);

    }

sql

	<update id="unLockStock">
        UPDATE wms_ware_sku
        SET stock_locked = stock_locked - #{num}
        WHERE
            sku_id = ${skuId}
          AND ware_id = #{wareId}
    </update>

---

关闭订单

回到提交订单的业务
当提交订单时库存锁定成功，给死信队列发消息，开始执行关闭订单的业务，删除购物车数据

				if (r.getCode() == 0) {
                    //锁定成功
                    responseVo.setOrder(order.getOrder());
                    // int i = 10/0;

                    //TODO 订单创建成功，发送消息给MQ
                    rabbitTemplate.convertAndSend("order-event-exchange","order.create.order",order.getOrder());

                    //删除购物车里的数据
                    redisTemplate.delete(CART_PREFIX+memberResponseVo.getId());
                    return responseVo;
                } else {
                    //锁定失败
                    String msg = (String) r.get("msg");
                    throw new NoStockException(msg);
                    // responseVo.setCode(3);
                    // return responseVo;
                }

监听普通队列的消息。当普通队列中监听到消息，说明死信队列订单过期，返还给普通队列来处理关闭订单的消息。

package com.xxxx.gulimall.order.listener;

import com.rabbitmq.client.Channel;
import com.xxxx.gulimall.order.entity.OrderEntity;
import com.xxxx.gulimall.order.service.OrderService;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;

/**
 * @Description: 定时关闭订单
 *
 **/

@RabbitListener(queues = "order.release.order.queue")
@Service
public class OrderCloseListener {

    @Autowired
    private OrderService orderService;

    @RabbitHandler
    public void listener(OrderEntity orderEntity, Channel channel, Message message) throws IOException {
        System.out.println("收到过期的订单信息，准备关闭订单" + orderEntity.getOrderSn());
        try {
            orderService.closeOrder(orderEntity);
            channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
        } catch (Exception e) {
            channel.basicReject(message.getMessageProperties().getDeliveryTag(),true);
        }

    }

}

关闭订单
订单关闭时发送消息给库存服务的普通队列，让库存服务解锁库存。

    /**
     * 关闭订单
     * @param orderEntity
     */
    @Override
    public void closeOrder(OrderEntity orderEntity) {

        //关闭订单之前先查询一下数据库，判断此订单状态是否已支付
        OrderEntity orderInfo = this.getOne(new QueryWrapper<OrderEntity>().
                eq("order_sn",orderEntity.getOrderSn()));

        if (orderInfo.getStatus().equals(OrderStatusEnum.CREATE_NEW.getCode())) {
            //代付款状态进行关单
            OrderEntity orderUpdate = new OrderEntity();
            orderUpdate.setId(orderInfo.getId());
            orderUpdate.setStatus(OrderStatusEnum.CANCLED.getCode());
            this.updateById(orderUpdate);

            // 发送消息给MQ
            OrderTo orderTo = new OrderTo();
            BeanUtils.copyProperties(orderInfo, orderTo);

            try {
                //TODO 确保每个消息发送成功，给每个消息做好日志记录，(给数据库保存每一个详细信息)保存每个消息的详细信息
                rabbitTemplate.convertAndSend("order-event-exchange", "order.release.other", orderTo);
            } catch (Exception e) {
                //TODO 定期扫描数据库，重新发送失败的消息
            }
        }

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