图片加水印方法-优快云博客

本文介绍了一种在图片上添加水印的方法，包括图片水印和文字水印两种形式。图片水印通过调整透明度将水印图片叠加到目标图片上；文字水印则允许自定义字体、颜色和透明度等参数。

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public final class ImageUtils {   
    /**  
     * 图片水印  
     * @param pressImg 水印图片  
     * @param targetImg 目标图片  
     * @param x 修正值 默认在中间  
     * @param y 修正值 默认在中间  
     * @param alpha 透明度  
     */  
    public final static void pressImage(String pressImg, String targetImg, int x, int y, float alpha) {   
        try {   
            File img = new File(targetImg);   
            Image src = ImageIO.read(img);   
            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);   
            //水印文件   
            Image src_biao = ImageIO.read(new File(pressImg));   
            int wideth_biao = src_biao.getWidth(null);   
            int height_biao = src_biao.getHeight(null);   
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));   
            g.drawImage(src_biao, (wideth - wideth_biao) / 2, (height - height_biao) / 2, wideth_biao, height_biao, null);   
            //水印文件结束   
            g.dispose();   
            ImageIO.write((BufferedImage) image, "jpg", img);   
        } catch (Exception e) {   
            e.printStackTrace();   
        }   
    }   
  
    /**  
     * 文字水印  
     * @param pressText 水印文字  
     * @param targetImg 目标图片  
     * @param fontName 字体名称  
     * @param fontStyle 字体样式  
     * @param color 字体颜色  
     * @param fontSize 字体大小  
     * @param x 修正值  
     * @param y 修正值  
     * @param alpha 透明度  
     */  
    public static void pressText(String pressText, String targetImg, String fontName, int fontStyle, Color color, int fontSize, int x, int y, float alpha) {   
        try {   
            File img = new File(targetImg);   
            Image src = ImageIO.read(img);   
            int width = src.getWidth(null);   
            int height = src.getHeight(null);   
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);   
            Graphics2D g = image.createGraphics();   
            g.drawImage(src, 0, 0, width, height, null);   
            g.setColor(color);   
            g.setFont(new Font(fontName, fontStyle, fontSize));   
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));   
            g.drawString(pressText, (width - (getLength(pressText) * fontSize)) / 2 + x, (height - fontSize) / 2 + y);   
            g.dispose();   
            ImageIO.write((BufferedImage) image, "jpg", img);   
        } catch (Exception e) {   
            e.printStackTrace();   
        }   
    }