首先，确保Seata-Server & Nacos 已经启动完毕

1. 导入相关依赖

导入seata的springcloud 启动器以及seata的依赖包(不要使用启动器中自带的seata-all，选择与你Seata-Server相同版本的依赖[如这是1.3.0])

<dependency>
  <groupId>com.alibaba.cloud</groupId>
  <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
  <exclusions>
    <exclusion>
      <groupId>io.seata</groupId>
      <artifactId>seata-all</artifactId>
    </exclusion>
  </exclusions>
</dependency>
<dependency>
  <groupId>io.seata</groupId>
  <artifactId>seata-all</artifactId>
  <version>1.3.0</version>
</dependency>

2. 复制file.conf和registry.conf到resources文件夹

3. 创建代理数据源

package cn.net.easycamp.carnetwork.order.config;
import com.alibaba.druid.pool.DruidDataSource;
import io.seata.rm.datasource.DataSourceProxy;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.transaction.SpringManagedTransactionFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import javax.sql.DataSource;
@Configuration
public class DataSourceProxyConfig {
    @Value("${mybatis.mapper-locations}")
    private String mapperLocations;
    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource druidDataSource(){
        return new DruidDataSource();
    }
    @Bean
    public DataSourceProxy dataSourceProxy(DataSource dataSource){
        return new DataSourceProxy(dataSource);
    }
    @Bean
    public SqlSessionFactory sqlSessionFactoryBean(DataSourceProxy dataSourceProxy) throws Exception{
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSourceProxy);
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations));
        sqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory());
        return sqlSessionFactoryBean.getObject();
    }
}

4. 修改主启动类的注解，排除默认的数据源自动装配

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)

5. 修改application.yml

添加如下的配置

spring:
    cloud:
      alibaba:
      seata:
        tx-service-group: fsp_tx_group # 这个名称需要和Seata-server中配置的名称相同

6. 配置完成，可以编写业务测试