使用Spring-Data-JPA的BLOB类型

import javax.persistence.*;

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

    @Lob
    @Column(name = "image_data", columnDefinition = "BLOB")
    private byte[] imageData;

    // Getters and Setters
}

@Repository
public interface ImageRepository extends JpaRepository<ImageEntity, Long> {
}

@Service
public class ImageService {
    @Autowired
    private ImageRepository imageRepository;

    public byte[] getImageData(Long id) {
        ImageEntity imageEntity = imageRepository.findById(id).orElseThrow(() -> new RuntimeException("Image not found"));
        return imageEntity.getImageData();
    }
}

@Service
public class ImageService {
    @Autowired
    private ImageRepository imageRepository;

    public ImageEntity saveImageData(byte[] imageData) {
        ImageEntity imageEntity = new ImageEntity();
        imageEntity.setImageData(imageData);
        return imageRepository.save(imageEntity);
    }
}