springboot + springcloud alibaba seata 使用TCC模式代码模板

以下是一个使用Spring Boot和Spring Cloud Alibaba Seata框架实现的TCC模式代码模板：

1. 创建一个Spring Boot项目，添加依赖：

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
    <version>2.2.0.RELEASE</version>
</dependency>

2. 配置Seata相关信息：

spring:
  application:
    name: tcc-demo

seata:
  enabled: true
  application-id: ${spring.application.name}
  tx-service-group: my_tx_group
  service:
    vgroup-mapping.my_tx_group: default
  config:
    type: nacos
    nacos:
      server-addr: localhost:8848
      namespace: public
  registry:
    type: nacos
    nacos:
      server-addr: localhost:8848
      namespace: public
  storage:
    type: db
    db:
      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql://localhost:3306/seata?useUnicode=true&characterEncoding=utf-8&useSSL=false
      username: root
      password: root

3. 创建一个TCC接口：

public interface TccService {

    @TccTransaction(confirmMethod = "confirm", cancelMethod = "cancel")
    boolean tryMethod(String businessKey, String param);

    boolean confirm(String businessKey, String param);

    boolean cancel(String businessKey, String param);
}

4. 实现TCC接口：

@Service
public class TccServiceImpl implements TccService {

    @Resource
    private TccMapper tccMapper;

    @Override
    public boolean tryMethod(String businessKey, String param) {
        TccEntity tccEntity = new TccEntity();
        tccEntity.setBusinessKey(businessKey);
        tccEntity.setParam(param);
        return tccMapper.insert(tccEntity) > 0;
    }

    @Override
    public boolean confirm(String businessKey, String param) {
        return true;
    }

    @Override
    public boolean cancel(String businessKey, String param) {
        return tccMapper.deleteByBusinessKey(businessKey) > 0;
    }
}

5. 配置TCC事务管理器：

@Configuration
public class SeataConfiguration {

    @Bean
    public GlobalTransactionScanner globalTransactionScanner() {
        return new GlobalTransactionScanner("tcc-demo", "my_tx_group");
    }

    @Bean
    public TccTransactionAspect tccTransactionAspect() {
        return new TccTransactionAspect();
    }

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

6. 测试TCC接口：

@RestController
@RequestMapping("/tcc")
public class TccController {

    @Resource
    private TccService tccService;

    @PostMapping("/try")
    public boolean tryMethod(@RequestParam String businessKey, @RequestParam String param) {
        return tccService.tryMethod(businessKey, param);
    }
}

以上是一个简单的TCC模式代码模板，可以根据实际业务需求进行修改和扩展。