Java 图片添加水印效果

package com.xiaowu.drawwater.demo;

import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;

/**
 * 在原图片的基础之上添加水印效果
 *
 *
 *
 * @author WQ
 *
 */
public class ImageMarkLogoByIcon {

    /**
     * @param args
     */
    public static void main(String[] args) {
        String srcImgPath = "D:/Test123/car.png";
        String iconPath = "D:/Test123/deal.png";
        String targerPath = "D:/Test123/img_mark_icon.jpg";
        String targerPath2 = "D:/Test123/img_mark_icon_rotate.jpg";
        // 给图片添加水印
        ImageMarkLogoByIcon.markImageByIcon(iconPath, srcImgPath, targerPath);
        // 给图片添加水印,水印旋转-45
        ImageMarkLogoByIcon.markImageByIcon(iconPath, srcImgPath, targerPath2,
                -45);   

    }   

    /**
     * 给图片添加水印
     * @param iconPath 水印图片路径
     * @param srcImgPath 源图片路径
     * @param targerPath 目标图片路径
     */
    public static void markImageByIcon(String iconPath, String srcImgPath,
            String targerPath) {
        markImageByIcon(iconPath, srcImgPath, targerPath, null);
    }   

    /**
     * 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
     */
    public static void markImageByIcon(String iconPath, String srcImgPath,
            String targerPath, Integer degree) {
        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);
            }   

            // 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 = 0.4f; // 透明度
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
                    alpha));   

            // 表示水印图片的位置
            g.drawImage(img, 15, 30, 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("图片完成添加Icon印章。。。。。。");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (null != os)
                    os.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

效果图: