java 为图片添加水印 示例

为图片添加水印 【核心代码】 /*** 添加水印* @param imagePath      图片绝对路径* @param watermarkPath  水印图片绝对路径* @param position  水印图片位置* @return 生成水印图片的绝对路径*/public static String addWatermark(String imagePath, String watermarkPath, String position) {logger.info("为图片({})在位置{}添加水印({})", imagePath, position, watermarkPath);if (StringUtils.isNotBlank(imagePath) && StringUtils.isNotBlank(watermarkPath)) {File image = new File(imagePath);File watermark = new File(watermarkPath);Position pos = getPostion(position);if (image.isFile() && image.exists() && watermark.isFile()) {try {BufferedImage bi = ImageIO.read(image);Builder builder = Thumbnails.of(imagePath);BufferedImage watermarkImg = ImageIO.read(watermark);File newWatermark = null;// 原图的宽或高是水印图片宽或高的2倍及以上,则直接打上水印原图;否则缩略水印图片,以原图宽或高的二分之一if (bi.getWidth() / watermarkImg.getWidth() <= 2 || bi.getHeight() / watermarkImg.getHeight() <= 2) {newWatermark = genNewWatermark(watermarkPath, bi.getWidth() / 2, bi.getHeight() / 2);watermarkImg = ImageIO.read(newWatermark);}builder.size(bi.getWidth(), bi.getHeight());if(bi.getType() == BufferedImage.TYPE_BYTE_INDEXED){builder.imageType(BufferedImage.TYPE_INT_ARGB);}if(pos instanceof Coordinate){serialWatermark(builder, bi, watermarkImg);}else{builder.watermark(pos, watermarkImg, Float.valueOf(PropertyUtil.get("watermarkOpacity")));// watermark(位置，水印图，透明度)}String newImagePath = generateNewFilePath(imagePath);builder.outputQuality(Float.valueOf(PropertyUtil.get("watermarkQuality"))).toFile(newImagePath);// 保存水印图的质量0-1if (newWatermark != null) {newWatermark.delete();}return newImagePath;} catch (Exception e) {logger.error("水印图片出错", e);return null;}} else {logger.error("图片或者水印不存在");return null;}} else {logger.error("图片或者水印参数为null");return null;}}