java图片添加水印和压缩详解编程语言

// 给图片添加水印 // ImageUtil.waterMarkImageByIcon("java水印图片", iconPath, srcImgPath, targerPath, 0, 0, 0, 0.5f); ImageUtil.waterMarkByText("java水印图片", srcImgPath, targerPath, 0, 0, 0, 0.5f); // 给图片添加水印,水印旋转-45 /** * 给图片添加水印、可设置水印图片旋转角度 * @param iconPath * 水印图片路径 * @param srcImgPath * 源图片路径 * @param targerPath * 目标图片路径 * @param degree * 水印图片旋转角度 * @param width * 宽度(与左相比) * @param height * 高度(与顶相比) * @param clarity * 透明度(小于1的数)越接近0越透明 public static void waterMarkImageByIcon(String logoText, String iconPath, String srcImgPath, String targerPath, Integer degree, Integer width, Integer height, float clarity) { OutputStream os = null; try { Image srcImg = ImageIO.read(new File(srcImgPath)); System.out.println("width:" + srcImg.getWidth(null)); System.out.println("height:" + srcImg.getHeight(null)); BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null), srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB); // 得到画笔对象 Graphics2D g = buffImg.createGraphics(); // 设置对线段的锯齿状边缘处理 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR); g.drawImage(srcImg.getScaledInstance(srcImg.getWidth(null), srcImg.getHeight(null), Image.SCALE_SMOOTH), 0, 0, null); if (null != degree) { // 设置水印旋转 g.rotate(Math.toRadians(degree), (double) buffImg.getWidth() / 2, (double) buffImg.getHeight() / 2); // 水印图象的路径 水印一般为gif或者png的，这样可设置透明度 ImageIcon imgIcon = new ImageIcon(iconPath); // 得到Image对象。 Image img = imgIcon.getImage(); float alpha = clarity; // 透明度 g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); // 表示水印图片的位置 // g.drawImage(img, width, height, null); g.drawImage(img, srcImg.getWidth(null) - img.getWidth(null), srcImg.getHeight(null) - img.getHeight(null), null); // g.drawString(logoText, srcImg.getWidth(null) - img.getWidth(null), srcImg.getHeight(null) - img.getHeight(null)); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER)); g.dispose(); os = new FileOutputStream(targerPath); // 生成图片 ImageIO.write(buffImg, "JPG", os); System.out.println("添加水印图片完成!"); } catch (Exception e) { e.printStackTrace(); } finally { try { if (null != os) os.close(); } catch (Exception e) { e.printStackTrace(); /** * 给图片添加水印、可设置水印图片旋转角度 * @param logoText * 水印文字 * @param srcImgPath * 源图片路径 * @param targerPath * 目标图片路径 * @param degree * 水印图片旋转角度 * @param width * 宽度(与左相比) * @param height * 高度(与顶相比) * @param clarity * 透明度(小于1的数)越接近0越透明 public static void waterMarkByText(String logoText, String srcImgPath, String targerPath, Integer degree, Integer width, Integer height, Float clarity) { // 主图片的路径 InputStream is = null; OutputStream os = null; try { Image srcImg = ImageIO.read(new File(srcImgPath)); BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null), srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB); // 得到画笔对象 // Graphics g= buffImg.getGraphics(); Graphics2D g = buffImg.createGraphics(); // 设置对线段的锯齿状边缘处理 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR); g.drawImage(srcImg.getScaledInstance(srcImg.getWidth(null), srcImg.getHeight(null), Image.SCALE_SMOOTH), 0, 0, null); if (null != degree) { // 设置水印旋转 g.rotate(Math.toRadians(degree), (double) buffImg.getWidth() / 2, (double) buffImg.getHeight() / 2); // 设置颜色 g.setColor(Color.red); // 设置 Font g.setFont(new Font("宋体", Font.BOLD, 30)); float alpha = clarity; g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); // 第一参数- 设置的内容，后面两个参数- 文字在图片上的坐标位置(x,y) . g.drawString(logoText, width, height); g.dispose(); os = new FileOutputStream(targerPath); // 生成图片 ImageIO.write(buffImg, "JPG", os); System.out.println("添加水印文字完成!"); } catch (Exception e) { e.printStackTrace(); } finally { try { if (null != is) is.close(); } catch (Exception e) { e.printStackTrace(); try { if (null != os) os.close(); } catch (Exception e) { e.printStackTrace(); /** * 图片缩放(图片等比例缩放为指定大小，空白部分以白色填充) * @param srcPath * 源图片路径 * @param destPath * 缩放后图片路径 public static void zoomImage(String srcPath, String destPath, int destHeight, int destWidth) { try { BufferedImage srcBufferedImage = ImageIO.read(new File(srcPath)); int imgWidth = destWidth; int imgHeight = destHeight; int srcWidth = srcBufferedImage.getWidth(); int srcHeight = srcBufferedImage.getHeight(); if (srcHeight = srcWidth) { imgWidth = (int) Math.round(((destHeight * 1.0 / srcHeight) * srcWidth)); } else { imgHeight = (int) Math.round(((destWidth * 1.0 / srcWidth) * srcHeight)); BufferedImage destBufferedImage = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB); Graphics2D graphics2D = destBufferedImage.createGraphics(); graphics2D.setBackground(Color.WHITE); graphics2D.clearRect(0, 0, destWidth, destHeight); graphics2D.drawImage(srcBufferedImage.getScaledInstance(imgWidth, imgHeight, Image.SCALE_SMOOTH), (destWidth / 2) - (imgWidth / 2), (destHeight / 2) - (imgHeight / 2), null); graphics2D.dispose(); ImageIO.write(destBufferedImage, "JPEG", new File(destPath)); } catch (IOException e) { e.printStackTrace();

原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/10425.html

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