springmvc上传图片《2》

server:
  port: 8082
spring:
  application:
    name: upload-service
  servlet:
    multipart:
      max-file-size: 5MB # 限制文件上传的大小

@RestController
@RequestMapping("upload")
public class UploadController {

    @Autowired
    private UploadService uploadService;

    /**
     * 上传图片功能
     * @param file
     * @return
     */
    @PostMapping("image")
    public ResponseEntity uploadImage(@RequestParam("file") MultipartFile file) {
        String url = this.uploadService.upload(file);
        if (StringUtils.isBlank(url)) {
            // url为空，证明上传失败
            return new ResponseEntity(HttpStatus.BAD_REQUEST);
        }
        // 返回200，并且携带url路径
        return ResponseEntity.ok(url);
    }
}

@Service
public class UploadService {

    private static final Logger logger = LoggerFactory.getLogger(UploadController.class);

    // 支持的文件类型
    private static final List suffixes = Arrays.asList("image/png", "image/jpeg");

    public String upload(MultipartFile file) {
        try {
            // 1、图片信息校验
            // 1)校验文件类型
            String type = file.getContentType();
            if (!suffixes.contains(type)) {
                logger.info("上传失败，文件类型不匹配：{}", type);
                return null;
            }
            // 2)校验图片内容
            BufferedImage image = ImageIO.read(file.getInputStream());
            if (image == null) {
                logger.info("上传失败，文件内容不符合要求");
                return null;
            }
            // 2、保存图片
            // 2.1、生成保存目录
            File dir = new File("D:\\heima\\upload");
            if (!dir.exists()) {
                dir.mkdirs();
            }
            // 2.2、保存图片
            file.transferTo(new File(dir, file.getOriginalFilename()));

            // 2.3、拼接图片地址
            String url = "http://image.leyou.com/upload/" + file.getOriginalFilename();

            return url;
        } catch (Exception e) {
            return null;
        }
    }
}