用cn.hutool工具包进行图片上传下载示例

• 实体类
• controller
• service
• • 数据转换的工具类
  • file工具类

Hutool-http针对JDK的HttpUrlConnection做一层封装，简化了HTTPS请求、文件上传、cookie记忆等操作，使Http请求变得无比简单。
用的是smms图床。
依赖：

        
            cn.hutool
            hutool-all
            5.7.12
        

@Data
public class PictureDto implements Serializable {

    
    private Long id;

    
    private Timestamp createTime;

    
    private String deleteUrl;

    
    private String filename;

    
    private String height;

    
    private String size;

    
    private String url;

    
    private String username;

    
    private String width;

    
    private String md5code;
}

@RestController
@RequestMapping("/api/pictures")
@Api(tags = "工具：免费图床管理")
public class PictureController {
    private final IGenerator generator;
    private final PictureService pictureService;

    public PictureController(IGenerator generator, PictureService pictureService) {
        this.generator = generator;
        this.pictureService = pictureService;
    }

    @Log("查询图片")
    @PreAuthorize("@el.check('pictures:list')")
    @GetMapping
    @ApiOperation("查询图片")
    public ResponseEntity