我想使用Sping Boot 将图像存储为MySQL数据库中的blob。我创建了以下模型来对数据库执行crud操作。

import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import javax.persistence.Lob;
    import javax.persistence.Table;

import org.hibernate.annotations.DynamicUpdate;

import com.fasterxml.jackson.annotation.JsonIgnore;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;

@Entity
@Table(name="user")
@DynamicUpdate(true)
@AllArgsConstructor
@Data
@NoArgsConstructor
@ToString
public class Users {

    @Id
    @GeneratedValue
    @Column(name="u_id")
    private Integer userId;
    @Column(name="f_nme")
    private String fNme;
    @Column(name="l_nme")
    private String lNme;
    @Column(name="email")
    private String email;
    @Column 
    @JsonIgnore
    private String password;
    @Column(name="cntry")
    private String country;
    @Column(name="type")
    private String type;
    @Lob
    @Column(name="prof_pic")
    private byte[] profPic;

    public Users() {}

    public Integer getId() {
        return userId;
    }

    public void setId(Integer id) {
        this.userId = id;
    }

    public String getfNme() {
        return fNme;
    }

    public void setfNme(String fNme) {
        this.fNme = fNme;
    }

    public String getlNme() {
        return lNme;
    }

    public void setlNme(String lNme) {
        this.lNme = lNme;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public byte[] getProfPicPath() {
        return profPic;
    }

    public void setProfPicPath(byte[] profPic) {
        System.out.println(profPic);
        this.profPic = profPic;
        System.out.println(this.profPic);
    }

}

下面是我的UserDTO类。

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import org.springframework.web.multipart.MultipartFile;

public class UserDTO {
    private String userID;
    private String email;
    private String password;
    private String country;
    private String fName;
    private String lName;
    private String type;
    private String profPicPath;

    public String getEmail() {
        return email;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public String getfName() {
        return fName;
    }

    public void setfName(String fName) {
        this.fName = fName;
    }

    public String getlName() {
        return lName;
    }

    public void setlName(String lName) {
        this.lName = lName;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getProfPicPath() {
        return profPicPath;
    }

    public void setProfPicPath(String profPicPath) {
        this.profPicPath = profPicPath;
    }

    public String getUserID() {
        return userID;
    }

    public void setUserID(String userID) {
        this.userID = userID;
    }
}

下面列出了我用来更新数据库的REST API。

import java.io.IOException;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import com.elmbridge.PropertyManagementSystem.model.UserDTO;
import com.elmbridge.PropertyManagementSystem.repository.SearchRepository;
import com.elmbridge.PropertyManagementSystem.service.JwtUserDetailsService;
@CrossOrigin(origins = "http://localhost:4200")
@RestController
public class DashboardController {

    @Autowired
    private JwtUserDetailsService userDetailsService;

    private UserDTO userR;

    @Autowired                                                                                  
    private SearchRepository user;

    @GetMapping("/country/{email}")
    public ResponseEntity<String> getCountry(@PathVariable("email") String email) {
        return ResponseEntity.ok(user.findCountryByEmail(email));
    }

    @PutMapping("/profile-picture/{email}")
    public void uploadImage(@RequestParam("file") MultipartFile imageFile, @PathVariable("email") String email) {
     try {
        byte[] img = imageFile.getBytes();
        System.out.println(img);
        userDetailsService.saveImg(img, email);
          System.out.println("Image saved");
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }    

    }

图像没有插入到数据库中。我检查了图像是否通过使用print语句接收到用户模型，发现图像接收没有问题。我已经将打算将图像保存在MySQL数据库中的字段的数据类型设置为长blob。有人能指出我这里有什么问题吗？