圖片加水印，是通過圖片重疊繪制實現的。實現代碼如下： public static void press(String pressImg, String pressText, String targetImg, String fontName, int fontStyle, int color, int fontSize, int x,?int y) { try { File _file = new File(targetImg); Image src = ImageIO.read(_file); int wideth = src.getWidth(null); int height = src.getHeight(null); BufferedImage image = new BufferedImage(wideth, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.drawImage(src, 0, 0, wideth, height, null); g.setColor(new Color(255, 255, 255, 80)); g.setFont(new Font(fontName, fontStyle, fontSize)); g.drawString(pressText, wideth - fontSize - x, height - fontSize?/ 2 - y); //水印文件 File _filebiao = new File(pressImg); Image src_biao = ImageIO.read(_filebiao); int wideth_biao = src_biao.getWidth(null); int height_biao = src_biao.getHeight(null); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.4f)); g.drawImage(src_biao, (wideth - wideth_biao) / 2, height - fontSize / 2 - 50, wideth_biao/2-10, height_biao/2-10, null); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER)); g.dispose(); FileOutputStream out = new FileOutputStream(targetImg); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); encoder.encode(image); out.close(); } catch (Exception e) { System.out.println(e); } } 圖片設置透明度 g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.4f)); g.drawImage(src_biao, (wideth - wideth_biao) / 2, height - fontSize / 2 - 50, wideth_biao/2-10, height_biao/2-10, null); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER)); 文字設置透明度 文字的透明度由顏色決定，因此只需要設置顏色的RGBA即可。如下： Graphics2D g = image.createGraphics(); g.drawImage(src, 0, 0, wideth, height, null); g.setColor(new Color(255, 255, 255, 80)); g.setFont(new Font(fontName, fontStyle, fontSize)); g.drawString(pressText, wideth - fontSize - x, height - fontSize/ 2 - y);

轉載于:https://www.cnblogs.com/asfeixue/p/4505408.html

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