spring 自定义事务管理器，编程式事务，声明式事务@Transactional使用

package com.trans.service.impl; import com.trans.annotation.MyTransaction; import com.trans.entity.User; import com.trans.resposity.UserRepository; import com.trans.service.UserService; import java.io.IOException; import java.sql.SQLException; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.PlatformTransactionManager; import org.springframework.transaction.TransactionDefinition; import org.springframework.transaction.TransactionStatus; import org.springframework.transaction.annotation.Isolation; import org.springframework.transaction.annotation.Propagation; import org.springframework.transaction.annotation.Transactional; import org.springframework.transaction.support.DefaultTransactionDefinition; @Service public class UserServiceImpl implements UserService { @Autowired UserRepository userRepository; @Autowired PlatformTransactionManager transactionManager; //编程式事务 @Override public User updateUser(User user){ //设置事务名称,事务隔离级别，传播性 DefaultTransactionDefinition definition = new DefaultTransactionDefinition(); definition.setName("编程式事务"); definition.setIsolationLevel(TransactionDefinition.ISOLATION_READ_COMMITTED); definition.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED); //获取事务并开启事务 TransactionStatus status = transactionManager.getTransaction(definition); User res=null; try{ res=userRepository.save(user); transactionManager.commit(status); //提交事务 }catch (Exception ex){ ex.printStackTrace(); //出现异常，回滚事务 transactionManager.rollback(status); } return res; } @MyTransaction @Override public User insert(User user) { User res=null; res=userRepository.save(user); throw new RuntimeException("11"); } @Transactional(propagation = Propagation.REQUIRES_NEW) public User addUser2(User user){ User res=null; try { userRepository.update(user.getUsername(),user.getId()); }catch (Exception ex){ ex.printStackTrace(); throw ex; } return res; } }