Java实现给图片添加水印-蒲公英云

原文转载自：http://blog.csdn.net/dy\_smile/article/details/6722907 ，有做部分修改

给图片添加图片/文字水印（源图片必须要比水印图片大）

package com.demo.demo;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.font.TextAttribute;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.text.AttributedCharacterIterator;
import java.text.AttributedString;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
/**
 * 图片水印Demo
 * @author thinkpad
 *
 */
public class ImageMarkLogoByIcon {
    public static void main(String[] args) {   
        String srcImgPath = "C:\\Users\\thinkpad\\Desktop\\timg.jpg";   
        String iconPath = "C:\\Users\\thinkpad\\Desktop\\waterMarking.png";   
        String targerPath = "C:\\Users\\thinkpad\\Desktop\\水印测试.png";   
        String targerPath2 = "C:\\Users\\thinkpad\\Desktop\\img_mark_icon_rotate.jpg";
      //水印内容
        String waterMarkContent="图片来源：http://www.baidu.com";  
      //水印图片色彩以及透明度
        Color color=new Color(255,255,255,128); 
        //水印字体
        Font font = new Font("微软雅黑", Font.PLAIN, 35);  
        // 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);   
        //给图片添加文字水印
        ImageMarkLogoByIcon.addTextWaterMark(srcImgPath,targerPath, waterMarkContent, color,font);
    }   
    /**  
     * 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 = 0.5f; // 透明度  (数值越大，透明度越小) 
            float alpha = 1f; // 透明度   
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,   
                    alpha)); 
            // 表示水印图片的位置   
            int iconWidth = img.getWidth(null); //水印图片宽度
            int iconHeight = img.getHeight(null);  //水印图片高度
            // g.drawImage(img, 水印位置的横坐标, 水印位置的纵坐标,水印宽度, 水印高度, null);  
            g.drawImage(img, buffImg.getWidth() - iconWidth, buffImg.getHeight() -iconHeight ,
                    iconWidth, iconHeight, 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();   
            }   
        }   
    }   
    /**
     * 给图片添加文字水印
     * @param srcImgPath 源图片路径
     * @param tarImgPath 保存的图片路径
     * @param waterMarkContent 水印内容
     * @param markContentColor 水印颜色
     * @param font 水印字体
     */
    public static void addTextWaterMark(String srcImgPath, String tarImgPath, String waterMarkContent,Color markContentColor,Font font) {
        try {
            // 读取原图片信息
            File srcImgFile = new File(srcImgPath);//得到文件
            Image srcImg = ImageIO.read(srcImgFile);//文件转化为图片
            int srcImgWidth = srcImg.getWidth(null);//获取图片的宽
            int srcImgHeight = srcImg.getHeight(null);//获取图片的高
            // 加水印
            BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
            Graphics2D g = bufImg.createGraphics();
            g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);
            g.setColor(markContentColor); //根据图片的背景设置水印颜色
            g.setFont(font);              //设置字体
            //设置水印的坐标
            int x = srcImgWidth - 2 * getWatermarkLength(waterMarkContent, g);  
            int y = srcImgHeight - getWatermarkLength(waterMarkContent, g);  
            System.out.println("源图宽度："+srcImgWidth+"   ,高度："+srcImgHeight);
            System.out.println("水印宽度："+getWatermarkLength(waterMarkContent, g)+"   ,高度："+getWatermarkLength(waterMarkContent, g));
            System.out.println("水印坐标的X轴："+x+"   ,Y轴："+y);
            g.drawString(waterMarkContent, x, y);  //画出水印
            g.dispose();  
            // 输出图片  
            FileOutputStream outImgStream = new FileOutputStream(tarImgPath);  
            ImageIO.write(bufImg, "jpg", outImgStream);
            System.out.println("添加水印完成");  
            outImgStream.flush();  
            outImgStream.close();  
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
    public static int getWatermarkLength(String waterMarkContent, Graphics2D g) {  
        return g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(), 0, waterMarkContent.length());  
    }  
}