Java给图片和PDF文件添加水印(图片水印和文字水印)

有时候我们看到的图片或者PDF文件会自动加上水印。分为文字水印和图片水印。

----------------------------图片水印----------------------------

1.添加文字水印

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;

import javax.imageio.ImageIO;

/**
 * 給图片添加文字水印
 * 
 * @author liqiang
 *
 */
public class WaterMarkUtils {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // 原图位置, 输出图片位置, 水印文字颜色, 水印文字
        new WaterMarkUtils().mark("C:/Users/liqiang/Desktop/图片/kdmt.jpg", "C:/Users/liqiang/Desktop/图片/kdmt1.jpg",
                Color.red, "圖片來源:XXX");
    }

    /**
     * 图片添加水印
     * 
     * @param srcImgPath
     *            需要添加水印的图片的路径
     * @param outImgPath
     *            添加水印后图片输出路径
     * @param markContentColor
     *            水印文字的颜色
     * @param waterMarkContent
     *            水印的文字
     */
    public void mark(String srcImgPath, String outImgPath, Color markContentColor, String waterMarkContent) {
        try {
            // 读取原图片信息
            File srcImgFile = new File(srcImgPath);
            Image srcImg = ImageIO.read(srcImgFile);
            int srcImgWidth = srcImg.getWidth(null);
            int srcImgHeight = srcImg.getHeight(null);
            // 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);
            // Font font = new Font("Courier New", Font.PLAIN, 12);
            Font font = new Font("宋体", Font.PLAIN, 20);
            g.setColor(markContentColor); // 根据图片的背景设置水印颜色

            g.setFont(font);
            int x = srcImgWidth - getWatermarkLength(waterMarkContent, g) - 3;
            int y = srcImgHeight - 3;
            // int x = (srcImgWidth - getWatermarkLength(watermarkStr, g)) / 2;
            // int y = srcImgHeight / 2;
            g.drawString(waterMarkContent, x, y);
            g.dispose();
            // 输出图片
            FileOutputStream outImgStream = new FileOutputStream(outImgPath);
            ImageIO.write(bufImg, "jpg", outImgStream);
            outImgStream.flush();
            outImgStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 获取水印文字总长度
     * 
     * @param waterMarkContent
     *            水印的文字
     * @param g
     * @return 水印文字总长度
     */
    public int getWatermarkLength(String waterMarkContent, Graphics2D g) {
        return g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(), 0, waterMarkContent.length());
    }
}

结果:

 2.给图片添加图片水印

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;

/**
 * 給图片添加图片
 * 
 * @author liqiang
 *
 */
public class WaterMarkUtils {

    /**
     * @param args
     */
    public static void main(String[] args) {
        String srcImgPath = "C:/Users/liqiang/Desktop/图片/kdmt.jpg";
        String iconPath = "C:/Users/liqiang/Desktop/图片/qlq.jpeg";
        String targerPath = "C:/Users/liqiang/Desktop/图片/qlq1.jpeg";
        String targerPath2 = "C:/Users/liqiang/Desktop/图片/qlq2.jpeg";
        // 给图片添加水印
        WaterMarkUtils.markImageByIcon(iconPath, srcImgPath, targerPath);
        // 给图片添加水印,水印旋转-45
        WaterMarkUtils.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();
            }
        }
    }
}

效果:

 

------------------------------PDF水印----------------------------

在这里就同时给PDF添加文字水印和图片水印(每一页都添加一个文字水印和图片水印)

依赖的包:

    <dependencies>
        <dependency>
            <groupId>com.lowagie</groupId>
            <artifactId>itextasian</artifactId>
            <version>1.0</version>
        </dependency>
        <dependency>
            <groupId>com.lowagie</groupId>
            <artifactId>itext</artifactId>
            <version>2.1.7</version>
        </dependency>
    </dependencies>

代码:

import java.awt.Color;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;

import com.lowagie.text.DocumentException;
import com.lowagie.text.Element;
import com.lowagie.text.Image;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfGState;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfStamper;

public class TestWaterPrint {
    public static void main(String[] args) throws DocumentException, IOException {
        // 要输出的pdf文件
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File("E:/abc.pdf")));
        Calendar cal = Calendar.getInstance();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        // 将pdf文件先加水印然后输出
        setWatermark(bos, "G:/1.pdf", format.format(cal.getTime()) + "  下载使用人：" + "测试user", 16);
    }

    /**
     * 
     * @param bos输出文件的位置
     * @param input
     *            原PDF位置
     * @param waterMarkName
     *            页脚添加水印
     * @param permission
     *            权限码
     * @throws DocumentException
     * @throws IOException
     */
    public static void setWatermark(BufferedOutputStream bos, String input, String waterMarkName, int permission)
            throws DocumentException, IOException {
        PdfReader reader = new PdfReader(input);
        PdfStamper stamper = new PdfStamper(reader, bos);
        int total = reader.getNumberOfPages() + 1;
        PdfContentByte content;
        BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED);
        PdfGState gs = new PdfGState();
        for (int i = 1; i < total; i++) {
            content = stamper.getOverContent(i);// 在内容上方加水印
            // content = stamper.getUnderContent(i);//在内容下方加水印
            gs.setFillOpacity(0.2f);
            // content.setGState(gs);
            content.beginText();
            content.setColorFill(Color.LIGHT_GRAY);
            content.setFontAndSize(base, 50);
            content.setTextMatrix(70, 200);
            content.showTextAligned(Element.ALIGN_CENTER, "公司内部文件，请注意保密！", 300, 350, 55);
            Image image = Image.getInstance("G:/2.jpeg");
            /*
              img.setAlignment(Image.LEFT | Image.TEXTWRAP);
              img.setBorder(Image.BOX); img.setBorderWidth(10);
              img.setBorderColor(BaseColor.WHITE); img.scaleToFit(100072);//大小
              img.setRotationDegrees(-30);//旋转
             */
            image.setAbsolutePosition(200, 206); // set the first background
                                                    // image of the absolute
            image.scaleToFit(200, 200);
            content.addImage(image);
            content.setColorFill(Color.BLACK);
            content.setFontAndSize(base, 8);
            content.showTextAligned(Element.ALIGN_CENTER, "下载时间：" + waterMarkName + "", 300, 10, 0);
            content.endText();

        }
        stamper.close();
    }
}

效果：