@RestController
public class UpAndDownController {

    @RequestMapping("uploadFile")
    public void upload(HttpServletRequest request) throws IOException {
        UploadService uploadService = new UploadService();
        uploadService.uploadBinary(request);
    }
}

public class UploadService {
    public String uploadBinary(HttpServletRequest request) throws IOException {
        ServletInputStream inputStream = null;
        FileOutputStream fileOutputStream = null;
        try {
            inputStream = request.getInputStream();

//            fileOutputStream = new FileOutputStream(new File("E:\\wordExport\\UpAndDown\\word_demo.docx"));
            fileOutputStream = new FileOutputStream(new File("E:\\wordExport\\UpAndDown\\testA001.jpg"));

            int len;
            byte[] bytes = new byte[1024];
            while((len = inputStream.read(bytes))!=-1){
                fileOutputStream.write(bytes,0,len);
            }
        } catch (IOException e) {
            e.printStackTrace();
            return "上传失败";
        }
        finally {
            if(fileOutputStream!=null){
                fileOutputStream.close();
            }
            if(inputStream!=null){
                inputStream.close();
            }
        }
        return "上传成功";
    }
}