如何通过SpringBoot JPA在MySQL中上传和保存图像

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

<dependency>
    <groupId>javax.activation</groupId>
    <artifactId>javax.activation-api</artifactId>
</dependency>

import javax.persistence.*;

@Entity
@Table(name = "images")
public class Image {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(nullable = false, length = 100)
    private String filename;

    @Lob
    @Column(nullable = false)
    private byte[] data;

    // Getters and setters
}

import org.springframework.data.jpa.repository.JpaRepository;

public interface ImageRepository extends JpaRepository<Image, Long> {
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;

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

    public void saveImage(MultipartFile file) throws IOException {
        Image image = new Image();
        image.setFilename(file.getOriginalFilename());
        image.setData(file.getBytes());
        imageRepository.save(image);
    }

    public Image getImage(Long id) {
        return imageRepository.findById(id).orElse(null);
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;

@RestController
public class ImageController {
    @Autowired
    private ImageService imageService;

    @PostMapping("/upload")
    public void uploadImage(@RequestParam("file") MultipartFile file) throws IOException {
        imageService.saveImage(file);
    }

    @GetMapping("/image/{id}")
    public Image getImage(@PathVariable("id") Long id) {
        return imageService.getImage(id);
    }
}