文件上传工具类

public class FileUtils {
	private final static Logger logger = LoggerFactory.getLogger(FileUtils.class);

	// 保存附件并返回URL
	public static String saveadditionFile(MultipartFile additionalFile, String uploadDir, String filesUrl)
			throws IOException {
		// 初始化StringBuffer用来保存 附件的URL
		StringBuffer stringBuffer = new StringBuffer();
		if (additionalFile != null) {
			String fileName = additionalFile.getOriginalFilename();// 获取文件名（包括后缀）
			String newFileName = UUID.randomUUID().toString().replace("-", "")
					+ fileName.substring(fileName.lastIndexOf("."));
			// 设置yyyyMM/dd文件夹
			Calendar c = Calendar.getInstance();
			c.setTime(new Date());
			String m = DateTimeUtil.dateToString(new Date(), "yyyyMM");
			int day = c.get(Calendar.DAY_OF_MONTH);
			String fileDir = uploadDir + File.separator + m + File.separator + day;
			File dir = new File(fileDir);
			if (!dir.exists()) {
				dir.mkdirs();
			}
			String url = filesUrl + "/" + m + "/" + day + "/" + newFileName;
			logger.info("url:" + url);
			FileOutputStream fos = null;
			try {
				fos = new FileOutputStream(dir.getAbsolutePath() + File.separator + newFileName);
				logger.info("filePath:" + dir.getAbsolutePath() + File.separator + newFileName);
				fos.write(additionalFile.getBytes());
				fos.close();
				stringBuffer.append(url);
			} catch (FileNotFoundException e) {
				logger.error("文件错误", e);
				throw e;
			} catch (IOException e) {
				logger.error("IO异常", e);
				throw e;
			}
		}

		return stringBuffer.toString();
	}
}