version: "3.1"
services:
  seata-server:
    image: seataio/seata-server:latest
    hostname: seata-server
    ports:
      - "7091:7091"
      - "8091:8091"
    environment:
      - SEATA_PORT=8091
      - STORE_MODE=file

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>seata</artifactId>
        <groupId>com.et</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>seata-order</artifactId>
    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.48</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.2</version>
        </dependency>
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-spring-boot-starter</artifactId>
            <version>1.1.0</version>
        </dependency>
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-http</artifactId>
            <version>1.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.8</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>
</project>

package com.et.seata.order.controller;
import com.et.seata.order.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
@RestController
public class HelloWorldController {
    @Autowired
    private OrderService orderService;
    @PostMapping("/create")
    public Map<String, Object> createOrder(@RequestParam("userId") Long userId,
                                              @RequestParam("productId") Long productId,
                                              @RequestParam("price") Integer price) throws IOException {
        Map<String, Object> map = new HashMap<>();
        map.put("msg", "HelloWorld");
        map.put("reuslt", orderService.createOrder(userId,productId,price));
        return map;
    }
}

package com.et.seata.order.service;
import com.alibaba.fastjson.JSONObject;
import com.et.seata.order.dao.OrderDao;
import com.et.seata.order.dto.OrderDO;
import io.seata.core.context.RootContext;
import io.seata.integration.http.DefaultHttpExecutor;
import io.seata.spring.annotation.GlobalTransactional;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpResponse;
import org.apache.http.util.EntityUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;
/**
 * @author liuhaihua
 * @version 1.0
 * @ClassName OrderServiceImpl
 * @Description todo
 * @date 2024/08/08/ 13:53
 */
@Slf4j
@Service
public class OrderServiceImpl implements OrderService{
   @Autowired
   OrderDao orderDao;
    @Override
    @GlobalTransactional // <1>
    public Integer createOrder(Long userId, Long productId, Integer price) throws IOException {
        Integer amount = 1; // 購(gòu)買數(shù)量，暫時(shí)設(shè)置為 1。
        log.info("[createOrder] 當(dāng)前 XID: {}", RootContext.getXID());
        // <2> 扣減庫(kù)存
        this.reduceStock(productId, amount);
        // <3> 扣減余額
        this.reduceBalance(userId, price);
        // <4> 保存訂單
        log.info("[createOrder] 保存訂單");
        return this.saveOrder(userId,productId,price,amount);
    }
    private Integer saveOrder(Long userId, Long productId, Integer price,Integer amount){
      // <4> 保存訂單
      OrderDO order = new OrderDO();
      order.setUserId(userId);
      order.setProductId(productId);
      order.setPayAmount(amount * price);
      orderDao.saveOrder(order);
      log.info("[createOrder] 保存訂單: {}", order.getId());
      return order.getId();
   }
    private void reduceStock(Long productId, Integer amount) throws IOException {
        // 參數(shù)拼接
        JSONObject params = new JSONObject().fluentPut("productId", String.valueOf(productId))
                .fluentPut("amount", String.valueOf(amount));
        // 執(zhí)行調(diào)用
        HttpResponse response = DefaultHttpExecutor.getInstance().executePost("http://127.0.0.1:8082", "/stock",
                params, HttpResponse.class);
        // 解析結(jié)果
        Boolean success = Boolean.valueOf(EntityUtils.toString(response.getEntity()));
        if (!success) {
            throw new RuntimeException("扣除庫(kù)存失敗");
        }
    }
    private void reduceBalance(Long userId, Integer price) throws IOException {
        // 參數(shù)拼接
        JSONObject params = new JSONObject().fluentPut("userId", String.valueOf(userId))
                .fluentPut("price", String.valueOf(price));
        // 執(zhí)行調(diào)用
        HttpResponse response = DefaultHttpExecutor.getInstance().executePost("http://127.0.0.1:8083", "/balance",
                params, HttpResponse.class);
        // 解析結(jié)果
        Boolean success = Boolean.valueOf(EntityUtils.toString(response.getEntity()));
        if (!success) {
            throw new RuntimeException("扣除余額失敗");
        }
    }
}

server:
  port: 8081 # 端口
spring:
  application:
    name: order-service
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/seata_order?useSSL=false&useUnicode=true&characterEncoding=UTF-8
    driver-class-name: com.mysql.jdbc.Driver
    username: root
    password: 123456
# Seata 配置項(xiàng)，對(duì)應(yīng) SeataProperties 類
seata:
  application-id: ${spring.application.name} # Seata 應(yīng)用編號(hào)，默認(rèn)為 ${spring.application.name}
  tx-service-group: ${spring.application.name}-group # Seata 事務(wù)組編號(hào)，用于 TC 集群名
  # 服務(wù)配置項(xiàng)，對(duì)應(yīng) ServiceProperties 類
  service:
    # 虛擬組和分組的映射
    vgroup-mapping:
      order-service-group: default
    # 分組和 Seata 服務(wù)的映射
    grouplist:
      default: 127.0.0.1:8091

package com.et.seata.product.controller;
import com.et.seata.product.dto.ProductReduceStockDTO;
import com.et.seata.product.service.ProductService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
@RestController
@Slf4j
public class ProductController {
   @Autowired
   ProductService productService;
   @PostMapping("/stock")
   public Boolean reduceStock(@RequestBody ProductReduceStockDTO productReduceStockDTO) {
      log.info("[reduceStock] 收到減少庫(kù)存請(qǐng)求, 商品:{}, 價(jià)格:{}", productReduceStockDTO.getProductId(),
            productReduceStockDTO.getAmount());
      try {
         productService.reduceStock(productReduceStockDTO.getProductId(), productReduceStockDTO.getAmount());
         // 正?？鄢龓?kù)存，返回 true
         return true;
      } catch (Exception e) {
         // 失敗扣除庫(kù)存，返回 false
         return false;
      }
   }
}

package com.et.seata.product.service;
import com.et.seata.product.dao.ProductDao;
import io.seata.core.context.RootContext;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
@Service
@Slf4j
public class ProductServiceImpl implements ProductService {
    @Autowired
    private ProductDao productDao;
    @Override
    @Transactional // <1> 開(kāi)啟新事物
    public void reduceStock(Long productId, Integer amount) throws Exception {
        log.info("[reduceStock] 當(dāng)前 XID: {}", RootContext.getXID());
        // <2> 檢查庫(kù)存
        checkStock(productId, amount);
        log.info("[reduceStock] 開(kāi)始扣減 {} 庫(kù)存", productId);
        // <3> 扣減庫(kù)存
        int updateCount = productDao.reduceStock(productId, amount);
        // 扣除成功
        if (updateCount == 0) {
            log.warn("[reduceStock] 扣除 {} 庫(kù)存失敗", productId);
            throw new Exception("庫(kù)存不足");
        }
        // 扣除失敗
        log.info("[reduceStock] 扣除 {} 庫(kù)存成功", productId);
    }
    private void checkStock(Long productId, Integer requiredAmount) throws Exception {
        log.info("[checkStock] 檢查 {} 庫(kù)存", productId);
        Integer stock = productDao.getStock(productId);
        if (stock < requiredAmount) {
            log.warn("[checkStock] {} 庫(kù)存不足，當(dāng)前庫(kù)存: {}", productId, stock);
            throw new Exception("庫(kù)存不足");
        }
    }
}

package com.et.seata.product.dao;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.springframework.stereotype.Repository;
@Mapper
@Repository
public interface ProductDao {
    /**
     * 獲取庫(kù)存
     *
     * @param productId 商品編號(hào)
     * @return 庫(kù)存
     */
    @Select("SELECT stock FROM product WHERE id = #{productId}")
    Integer getStock(@Param("productId") Long productId);
    /**
     * 扣減庫(kù)存
     *
     * @param productId 商品編號(hào)
     * @param amount    扣減數(shù)量
     * @return 影響記錄行數(shù)
     */
    @Update("UPDATE product SET stock = stock - #{amount} WHERE id = #{productId} AND stock >= #{amount}")
    int reduceStock(@Param("productId") Long productId, @Param("amount") Integer amount);
}

package com.et.seata.balance.controller;
import com.et.seata.balance.dto.AccountReduceBalanceDTO;
import com.et.seata.balance.service.AccountService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.HashMap;
import java.util.Map;
@RestController
@Slf4j
public class AccountController {
   @Autowired
   private AccountService accountService;
   @PostMapping("/balance")
   public Boolean reduceBalance(@RequestBody AccountReduceBalanceDTO accountReduceBalanceDTO) {
      log.info("[reduceBalance] 收到減少余額請(qǐng)求, 用戶:{}, 金額:{}", accountReduceBalanceDTO.getUserId(),
            accountReduceBalanceDTO.getPrice());
      try {
         accountService.reduceBalance(accountReduceBalanceDTO.getUserId(), accountReduceBalanceDTO.getPrice());
         // 正?？鄢囝~，返回 true
         return true;
      } catch (Exception e) {
         // 失敗扣除余額，返回 false
         return false;
      }
   }
}

package com.et.seata.balance.service;
import com.et.seata.balance.dao.AccountDao;
import io.seata.core.context.RootContext;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
@Service
@Slf4j
public class AccountServiceImpl implements AccountService {
    @Autowired
    private AccountDao accountDao;
    @Override
    @Transactional(propagation = Propagation.REQUIRES_NEW) // <1> 開(kāi)啟新事物
    public void reduceBalance(Long userId, Integer price) throws Exception {
        log.info("[reduceBalance] 當(dāng)前 XID: {}", RootContext.getXID());
        // <2> 檢查余額
        checkBalance(userId, price);
        log.info("[reduceBalance] 開(kāi)始扣減用戶 {} 余額", userId);
        // <3> 扣除余額
        int updateCount = accountDao.reduceBalance(price);
        // 扣除成功
        if (updateCount == 0) {
            log.warn("[reduceBalance] 扣除用戶 {} 余額失敗", userId);
            throw new Exception("余額不足");
        }
        log.info("[reduceBalance] 扣除用戶 {} 余額成功", userId);
    }
    private void checkBalance(Long userId, Integer price) throws Exception {
        log.info("[checkBalance] 檢查用戶 {} 余額", userId);
        Integer balance = accountDao.getBalance(userId);
        if (balance < price) {
            log.warn("[checkBalance] 用戶 {} 余額不足，當(dāng)前余額:{}", userId, balance);
            throw new Exception("余額不足");
        }
    }
}

package com.et.seata.balance.dao;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.springframework.stereotype.Repository;
@Mapper
@Repository
public interface AccountDao {
    /**
     * 獲取賬戶余額
     *
     * @param userId 用戶 ID
     * @return 賬戶余額
     */
    @Select("SELECT balance FROM account WHERE id = #{userId}")
    Integer getBalance(@Param("userId") Long userId);
    /**
     * 扣減余額
     *
     * @param price 需要扣減的數(shù)目
     * @return 影響記錄行數(shù)
     */
    @Update("UPDATE account SET balance = balance - #{price} WHERE id = 1 AND balance >= ${price}")
    int reduceBalance(@Param("price") Integer price);
}