public static String generateThumbnail(File thumbnail,String targetAddr) {
		String realFileName = getRandomFileName();
		String extension = getFileExtension(thumbnail);
		makeDirPath(targetAddr);
		String relativeAddr = targetAddr + realFileName + extension;
		logger.debug("current relativeAddr is" + relativeAddr);
		File dest = new File(PathUtil.getImgBasePath()+relativeAddr);
		logger.debug("current completeAddr is" + PathUtil.getImgBasePath() + relativeAddr);
		try {
			Thumbnails.of(thumbnail).size(200, 200)
			.watermark(Positions.BOTTOM_RIGHT,ImageIO.read(new File(basePath + "/watermark.jpg")),0.25f)
			.outputQuality(0.8).toFile(dest);
			Thumbnails.of(thumbnail).size(200, 200)
			.watermark(Positions.BOTTOM_RIGHT,ImageIO.read(new File("/watermark.jpg")),0.25f)
			.outputQuality(0.8).toFile(dest);
		}catch(IOException e) {
			logger.error(e.toString());
			e.printStackTrace();
		}
		return relativeAddr;
	}