package com.yidao.common;   
  
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;
  
/**  
 * 图片加水印。设置透明度
 * http://blog.csdn.net/hfmbook
 * @author Gary 
 * 创建日期：2014年12月16日 22:45:17
 */  
public class ImageMarkLogoByIcon {   
  
    /**  
     * @param args  
     */  
    public static void main(String[] args) {   
        String srcImgPath = "c:/1111.png";   
        String iconPath = "c:/0439.jpg";   
        String targerPath = "c:/c.png" ; 
         // 给图片加入水印   
        ImageMarkLogoByIcon.markImageByIcon(iconPath, srcImgPath, targerPath , -45);  
    }   
    /**  
     * 给图片加入水印  
     * @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) ; 
    }   
    /**  
     * 给图片加入水印、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 = 0.2f; // 透明度   
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,   
                    alpha));   
            // 表示水印图片的位置   
            g.drawImage(img, 150, 300, 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();   
            }   
        }   
    }   
}