又是一个文件上传（可用）-优快云博客

本文链接：https://blog.youkuaiyun.com/jdaiwlsd/article/details/120475605

本文介绍了一个RESTful API的实现，用于上传文件到本地服务器，包括参数验证、MultipartFile处理和错误处理。同时，对比了配置文件中的传统上传方式和新的文件路径管理策略。

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/**
	 * 上传文件
	 *
	 * @param file
	 * @param request
	 * @return
	 */
	@ResponseBody
	@PostMapping("uploadFile")
	@ApiOperation(value = "上传文件（本地）")
	public ResultDTO<String> uploadFile(MultipartFile file, HttpServletRequest request) {

		ResultDTO<String> result = new ResultDTO<>();
		if (CommonFuntions.isEmptyObject(file)) {
			return result.set(ResultCodeEnum.ERROR_INVALID_PARAMS, "文件不能为空");
		}
		String fileNameUrl = null;
		if (file != null) {
			FileInfoDTO fileInfo = FileUtils.uploadFile(file);
			fileNameUrl = fileInfo.getUrl();
		}
		if (StringUtils.isEmpty(fileNameUrl)) {
			return result.set(ResultCodeEnum.FAIL, "文件上传失败！", fileNameUrl);
		} else {
			return result.set(ResultCodeEnum.SUCCESS, "文件上传成功！", fileNameUrl);
		}
	}




配置文件中的配置
//		file.path=/Users/sensancao/file/cloudcity/
		filePath = PropertiesUtils.getProperty("file.path");
//		file.prefix=/files/
		filePrefix = PropertiesUtils.getProperty("file.prefix");


/**
	 * 文件上传
	 * 
	 * @author liqg @creationDate. 2015-5-30 下午3:21:59
	 * @param file
	 * @return
	 */
	public static FileInfoDTO uploadFile(MultipartFile file) {
		if (file != null) {
			InputStream in = null;
			OutputStream out = null;
			try {
				int BUFFER_SIZE = 16 * 1024;

				String fileName = file.getOriginalFilename();
				// 拼接完整路径
				Calendar c = Calendar.getInstance();
				String directory = c.get(Calendar.YEAR) + "/" + (c.get(Calendar.MONTH) + 1) + "/"
						+ c.get(Calendar.DATE) + "/";
				String path = filePath + directory; // 文件保存的物理路径

				File dstFile = new File(path);
				if (!dstFile.exists()) {
					dstFile.mkdirs();
				}
				// 文件名
				String newFileName = c.getTimeInMillis() + fileName.substring(fileName.lastIndexOf("."));
				dstFile = new File(path + newFileName);

				in = new BufferedInputStream(file.getInputStream(), BUFFER_SIZE);
				out = new BufferedOutputStream(new FileOutputStream(dstFile), BUFFER_SIZE);
				byte[] buffer = new byte[BUFFER_SIZE];
				int len = 0;
				while ((len = in.read(buffer)) > 0) {
					out.write(buffer, 0, len);
				}
				// 文件信息
				FileInfoDTO fileInfo = new FileInfoDTO();
				fileInfo.setFileName(fileName);
				fileInfo.setPath(path);
				fileInfo.setSize(file.getSize());
				 fileInfo.setUrl(filePrefix + "/" + directory + newFileName);
//				fileInfo.setUrl(directory + newFileName);

				return fileInfo;
			} catch (Exception e) {
				log.error("文件上传异常", e);
			} finally {
				try {
					if (in != null) {
						in.close();
						in = null;
					}
					if (out != null) {
						out.close();
						out = null;
					}
				} catch (IOException e) {
				}
			}
		}
		return null;
	}