java实现水印功能

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图片水印：

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.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

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

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageDecoder;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

/**
 * 图片水印
 * @blog http://sjsky.iteye.com
 * @author Michael
 */
public class ImageMarkLogoByIcon {

    /**
     * @param args
     */
    public static void main(String[] args) {
        String srcImgPath = "d:/test/michael/myblog_01.png";
        String iconPath = "d:/test/michael/blog_logo.png";
        String targerPath = "d:/test/michael/img_mark_icon.jpg";
        String targerPath2 = "d:/test/michael/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 = 0.5f; // 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);

            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();
            }
        }
    }
}

文字水印：

package michael.io.image;

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.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import javax.imageio.ImageIO;

/**
 * 文字水印
 * @blog http://sjsky.iteye.com
 * @author Michael
 */
public class ImageMarkLogoByText {

    /**
     * @param args
     */
    public static void main(String[] args) {
        String srcImgPath = "d:/test/michael/myblog_01.jpg";
        String logoText = "[ 测试文字水印 http://sjsky.iteye.com ]";
        String targerPath = "d:/test/michael/img_mark_text.jpg";

        String targerPath2 = "d:/test/michael/img_mark_text_rotate.jpg";

        // 给图片添加水印
        ImageMarkLogoByText.markByText(logoText, srcImgPath, targerPath);

        // 给图片添加水印,水印旋转-45
        ImageMarkLogoByText.markByText(logoText, srcImgPath, targerPath2, -45);
    }

    /**
     * 给图片添加水印
     * @param logoText
     * @param srcImgPath
     * @param targerPath
     */
    public static void markByText(String logoText, String srcImgPath,
            String targerPath) {
        markByText(logoText, srcImgPath, targerPath, null);
    }

    /**
     * 给图片添加水印、可设置水印的旋转角度
     * @param logoText
     * @param srcImgPath
     * @param targerPath
     * @param degree
     */
    public static void markByText(String logoText, String srcImgPath,
            String targerPath, Integer degree) {
        // 主图片的路径
        InputStream is = null;
        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);
            }

            // 设置颜色
            g.setColor(Color.red);

            // 设置 Font
            g.setFont(new Font("宋体", Font.BOLD, 30));

            float alpha = 0.5f;
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
                    alpha));

            // 第一参数->设置的内容，后面两个参数->文字在图片上的坐标位置(x,y) .
            g.drawString(logoText, 150, 300);

            g.dispose();

            os = new FileOutputStream(targerPath);

            // 生成图片
            ImageIO.write(buffImg, "JPG", os);

            System.out.println("图片完成添加文字印章。。。。。。");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (null != is)
                    is.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            try {
                if (null != os)
                    os.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

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