java 给图片添加 水印图片

package michael.io.image; 
 
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;
 
/**
 * 图片水印
 */ 
public class ImageMarkLogoByIcon { 
    /**
     * 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 
            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 iconimg = imgIcon.getImage(); 
            float alpha = 0.5f; // 透明度 
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); 
            // 表示水印图片的位置 
            g.drawImage(iconimg,(srcImg.getWidth(null)-iconimg.getWidth(null))/2,(srcImg.getHeight(null)-iconimg.getHeight(null))/2, null);
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
            g.dispose(); 
            os = new FileOutputStream(targerPath); 
            // 生成图片 
            ImageIO.write(buffImg, "JPG", os); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } finally { 
            try { 
                if (null != os) 
                    os.close(); 
            } catch (Exception e) { 
                e.printStackTrace(); 
            } 
        } 
    } 
} 

package michael.io.image;

public class Test
{
    /**
     * @param args
     */ 
    public static void main(String[] args) { 
        String iconPath = "c:/shui.png";
        String srcImgPath = "c:/002.jpg"; 
        String targerPath = "c:/添加水印.jpg"; 
        // 给图片添加水印 
        ImageMarkLogoByIcon.markImageByIcon(iconPath, srcImgPath, targerPath,-45); 
    }
}

效果图：