整合Spring Cloud Alibaba 2025.0.0与Seata 2.0及MyBatis-Plus的完整教程

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环境准备

• JDK 17+
• Maven 3.8+
• Spring Boot 3.2.0
• Spring Cloud Alibaba 2025.0.0
• Seata 2.0.0
• MyBatis-Plus 3.5.6
• Nacos 2.3.0（注册中心与配置中心）

项目依赖配置

在父工程pom.xml中定义版本管理：

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-dependencies</artifactId>
            <version>2025.0.0</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>
    </dependencies>
</dependencyManagement>

子模块中添加具体依赖：

<dependencies>
    <!-- Spring Cloud Alibaba -->
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    </dependency>
    
    <!-- Seata -->
    <dependency>
        <groupId>io.seata</groupId>
        <artifactId>seata-spring-boot-starter</artifactId>
    </dependency>
    
    <!-- MyBatis-Plus -->
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <version>3.5.6</version>
    </dependency>
</dependencies>

Seata Server部署

下载Seata 2.0.0并解压，修改conf/application.yml：

seata:
  config:
    type: nacos
    nacos:
      server-addr: 127.0.0.1:8848
      namespace: seata
      group: SEATA_GROUP
  registry:
    type: nacos
    nacos:
      application: seata-server
      server-addr: 127.0.0.1:8848
      namespace: seata

初始化Nacos配置：

sh ${SEATA_HOME}/script/config-center/nacos/nacos-config.sh -h 127.0.0.1 -p 8848 -g SEATA_GROUP

启动Seata Server：

sh ${SEATA_HOME}/bin/seata-server.sh

业务系统配置

application.yml配置示例：

spring:
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
  datasource:
    url: jdbc:mysql://localhost:3306/seata_demo?useSSL=false
    username: root
    password: 123456

seata:
  application-id: ${spring.application.name}
  tx-service-group: my_test_tx_group
  service:
    vgroup-mapping:
      my_test_tx_group: default
  registry:
    type: nacos
    nacos:
      server-addr: 127.0.0.1:8848
      namespace: seata

MyBatis-Plus集成

配置数据源代理：

@Configuration
public class DataSourceConfig {
    
    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource dataSource() {
        return new DruidDataSource();
    }

    @Primary
    @Bean("dataSourceProxy")
    public DataSourceProxy dataSourceProxy(DataSource dataSource) {
        return new DataSourceProxy(dataSource);
    }

    @Bean
    public SqlSessionFactory sqlSessionFactory(DataSourceProxy dataSourceProxy) throws Exception {
        MybatisSqlSessionFactoryBean factory = new MybatisSqlSessionFactoryBean();
        factory.setDataSource(dataSourceProxy);
        return factory.getObject();
    }
}

分布式事务测试

定义服务层方法：

@Service
public class OrderService {
    
    @GlobalTransactional
    public void createOrder(Order order) {
        // 1. 创建订单
        orderMapper.insert(order);
        
        // 2. 调用库存服务扣减库存
        storageFeignClient.deduct(order.getProductId(), order.getCount());
        
        // 3. 调用账户服务扣款
        accountFeignClient.debit(order.getUserId(), order.getMoney());
    }
}

异常回滚测试

模拟业务异常触发回滚：

@GlobalTransactional
public void createOrderWithException(Order order) {
    orderMapper.insert(order);
    storageFeignClient.deduct(order.getProductId(), order.getCount());
    // 模拟异常
    int i = 1/0; 
}

关键注意事项

• 确保所有微服务的seata.tx-service-group命名一致
• 每个涉及分布式事务的数据库都需要创建undo_log表
• Feign调用时需要传递XID（通过Seata的自动配置已实现）
• 生产环境建议使用Seata的高可用模式

通过以上步骤即可完成Spring Cloud Alibaba 2025.0.0与Seata 2.0及MyBatis-Plus的完整集成，实现分布式事务控制。