如何使用MySQL在Spring Boot中处理重复的多次插入？

@Entity
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(unique = true)
    private String email;

    // 其他字段和方法
}

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    // 其他方法

    @Override
    @Transactional(rollbackFor = DataIntegrityViolationException.class)
    <S extends User> S save(S entity);
}

@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;

    public User saveUser(User user) {
        try {
            return userRepository.save(user);
        } catch (DataIntegrityViolationException e) {
            // 处理重复插入的逻辑
            // 返回自定义的错误信息或执行其他操作
        }
    }
}