SpringMVC multipart文件上传

FileUploadController

@Controller
public class FileUploadController {
    @Resource
    private UploadManager uploadManager;
    @RequestMapping(value = "", method = RequestMethod.POST)
    public String handleFormUpload(@RequestParam("file") MultipartFile file) {
        if (!file.isEmpty()) {
          AttachmentDTO atta = new AttachmentDTO();
					atta.setName(file.getOriginalFilename());
					atta.setFileBytes(file.getBytes());
					atta.setFileExt(FilenameUtils.getExtension(file.getOriginalFilename()));
          return uploadManager.uploadFile(atta);
       } else {
           logger.warn("没有文件");
       }
    }

}

UploadManager

public class UploadManager{
  
	public String uploadFile(AttachmentDTO atta){
	  Srting fileName = createFileName();  // 文件名
	  String dirPath = getDirPath(); // 获取文件存储路径
	  File d = new File(dirPath);
		if (!d.exists()) {
			d.mkdirs();
		}
		File destFilePath = new File(dirPath + fileName);
		if (destFilePath.exists()) {	//若文件已存在，则重新生成fileName保存
  		// 做处理
		} else {
			try {
				FileCopyUtils.copy(atta.getFileBytes(), destFilePath);
			} catch (IOException e) {
				throw new BusinessException("附件存储失败，missionCode=" + missionCode, e);
			}
		}
		return fileName;
	}
}