We often see watermarks of certain companies or brands on some pictures or pictures, so can we add watermarks to our favorite pictures or files ourselves? The answer is of course no problem.

Let’s take a look at the picture watermark first:

----------------------------Picture watermark ----------------------------

1. Add text watermark

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;

/**
?*?給圖片添加文字水印
?*?
?*?@author?liqiang
?*
?*/
public?class?WaterMarkUtils?{

????/**
?????*?@param?args
?????*/
????public?static?void?main(String[]?args)?{
????????//?原圖位置,?輸出圖片位置,?水印文字顏色,?水印文字
????????new?WaterMarkUtils().mark("C:/Users/liqiang/Desktop/圖片/kdmt.jpg",?"C:/Users/liqiang/Desktop/圖片/kdmt1.jpg",
????????????????Color.red,?"圖片來源:XXX");
????}

????/**
?????*?圖片添加水印
?????*?
?????*?@param?srcImgPath
?????*????????????需要添加水印的圖片的路徑
?????*?@param?outImgPath
?????*????????????添加水印后圖片輸出路徑
?????*?@param?markContentColor
?????*????????????水印文字的顏色
?????*?@param?waterMarkContent
?????*????????????水印的文字
?????*/
????public?void?mark(String?srcImgPath,?String?outImgPath,?Color?markContentColor,?String?waterMarkContent)?{
????????try?{
????????????//?讀取原圖片信息
????????????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("宋體",?Font.PLAIN,?20);
????????????g.setColor(markContentColor);?//?根據(jù)圖片的背景設(shè)置水印顏色

????????????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();
????????????//?輸出圖片
????????????FileOutputStream?outImgStream?=?new?FileOutputStream(outImgPath);
????????????ImageIO.write(bufImg,?"jpg",?outImgStream);
????????????outImgStream.flush();
????????????outImgStream.close();
????????}?catch?(Exception?e)?{
????????????e.printStackTrace();
????????}
????}

????/**
?????*?獲取水印文字總長度
?????*?
?????*?@param?waterMarkContent
?????*????????????水印的文字
?????*?@param?g
?????*?@return?水印文字總長度
?????*/
????public?int?getWatermarkLength(String?waterMarkContent,?Graphics2D?g)?{
????????return?g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(),?0,?waterMarkContent.length());
????}
}

Result:

2. Add image watermark to the picture

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;

/**
?*?給圖片添加圖片
?*?
?*?@author?liqiang
?*
?*/
public?class?WaterMarkUtils?{

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

????}

????/**
?????*?給圖片添加水印
?????*?
?????*?@param?iconPath
?????*????????????水印圖片路徑
?????*?@param?srcImgPath
?????*????????????源圖片路徑
?????*?@param?targerPath
?????*????????????目標(biāo)圖片路徑
?????*/
????public?static?void?markImageByIcon(String?iconPath,?String?srcImgPath,?String?targerPath)?{
????????markImageByIcon(iconPath,?srcImgPath,?targerPath,?null);
????}

????/**
?????*?給圖片添加水印、可設(shè)置水印圖片旋轉(zhuǎn)角度
?????*?
?????*?@param?iconPath
?????*????????????水印圖片路徑
?????*?@param?srcImgPath
?????*????????????源圖片路徑
?????*?@param?targerPath
?????*????????????目標(biāo)圖片路徑
?????*?@param?degree
?????*????????????水印圖片旋轉(zhuǎn)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);

????????????//?得到畫筆對(duì)象
????????????//?Graphics?g=?buffImg.getGraphics();
????????????Graphics2D?g?=?buffImg.createGraphics();

????????????//?設(shè)置對(duì)線段的鋸齒狀邊緣處理
????????????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)?{
????????????????//?設(shè)置水印旋轉(zhuǎn)
????????????????g.rotate(Math.toRadians(degree),?(double)?buffImg.getWidth()?/?2,?(double)?buffImg.getHeight()?/?2);
????????????}

????????????//?水印圖象的路徑?水印一般為gif或者png的，這樣可設(shè)置透明度
????????????ImageIcon?imgIcon?=?new?ImageIcon(iconPath);

????????????//?得到Image對(duì)象。
????????????Image?img?=?imgIcon.getImage();

????????????float?alpha?=?0.5f;?//?透明度
????????????g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,?alpha));

????????????//?表示水印圖片的位置
????????????g.drawImage(img,?150,?300,?null);

????????????g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));

????????????g.dispose();

????????????os?=?new?FileOutputStream(targerPath);

????????????//?生成圖片
????????????ImageIO.write(buffImg,?"JPG",?os);

????????????System.out.println("圖片完成添加Icon印章。。。。。。");
????????}?catch?(Exception?e)?{
????????????e.printStackTrace();
????????}?finally?{
????????????try?{
????????????????if?(null?!=?os)
????????????????????os.close();
????????????}?catch?(Exception?e)?{
????????????????e.printStackTrace();
????????????}
????????}
????}
}

Effect display:

(Free video tutorial: java video tutorial)

------------------------ -----PDF watermark (itext add watermark)-------------------------------

At the same time here Add text watermark and picture watermark to PDF (add a text watermark and picture watermark to each page)

Dependent package:

<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>

Specific code:

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?{
????????//?要輸出的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");
????????//?將pdf文件先加水印然后輸出
????????setWatermark(bos,?"G:/1.pdf",?format.format(cal.getTime())?+?"??下載使用人："?+?"測試user",?16);
????}

????/**
?????*?
?????*?@param?bos輸出文件的位置
?????*?@param?input
?????*????????????原PDF位置
?????*?@param?waterMarkName
?????*????????????頁腳添加水印
?????*?@param?permission
?????*????????????權(quán)限碼
?????*?@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?<p>Effect display: </p><p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/image/584/251/170/1615519483789827.png" class="lazy" title="1615519483789827.png" alt="Java implements adding image watermarks and text watermarks"></p><p>Supplement: About the usage of fonts</p><p>1. Use the fonts in iTextAsian.jar </p><pre class="brush:php;toolbar:false">BaseFont.createFont("STSong-Light",?"UniGB-UCS2-H",BaseFont.NOT_EMBEDDED);

2. Use Windows system font

BaseFont.createFont("C:/WINDOWS/Fonts/SIMYOU.TTF",?BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);

3. Use resource fonts (ClassPath), that is, copy the ttf font to the src directory

BaseFont.createFont("/SIMYOU.TTF",?BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);

. The three methods have been personally tested and effective, and use The fonts that come with itext are enough and can handle Chinese correctly.

Additional information: Regarding obtaining the height and width of the PDF page and then dynamically positioning it, for example, implementing tiled watermarks based on the page width:

package?cn.xm.exam.test;

import?java.awt.FontMetrics;
import?java.io.BufferedOutputStream;
import?java.io.File;
import?java.io.FileOutputStream;
import?java.io.IOException;

import?javax.swing.JLabel;

import?com.itextpdf.text.DocumentException;
import?com.itextpdf.text.Element;
import?com.itextpdf.text.Rectangle;
import?com.itextpdf.text.pdf.BaseFont;
import?com.itextpdf.text.pdf.PdfContentByte;
import?com.itextpdf.text.pdf.PdfGState;
import?com.itextpdf.text.pdf.PdfReader;
import?com.itextpdf.text.pdf.PdfStamper;

public?class?TestWaterPrint?{
????public?static?void?main(String[]?args)?throws?DocumentException,?IOException?{
????????//?要輸出的pdf文件
????????BufferedOutputStream?bos?=?new?BufferedOutputStream(new?FileOutputStream(new?File("F:/test1.pdf")));
????????//?將pdf文件先加水印然后輸出
????????setWatermark(bos,?"F:/test.pdf",?"測試user");
????}

????/**
?????*?
?????*?@param?bos輸出文件的位置
?????*?@param?input
?????*????????????原PDF位置
?????*?@param?waterMarkName
?????*????????????頁腳添加水印
?????*?@throws?DocumentException
?????*?@throws?IOException
?????*/
????public?static?void?setWatermark(BufferedOutputStream?bos,?String?input,?String?waterMarkName)
????????????throws?DocumentException,?IOException?{

????????PdfReader?reader?=?new?PdfReader(input);
????????PdfStamper?stamper?=?new?PdfStamper(reader,?bos);

????????//?獲取總頁數(shù)?+1,?下面從1開始遍歷
????????int?total?=?reader.getNumberOfPages()?+?1;
????????//?使用classpath下面的字體庫
????????BaseFont?base?=?null;
????????try?{
????????????base?=?BaseFont.createFont("/calibri.ttf",?BaseFont.IDENTITY_H,?BaseFont.NOT_EMBEDDED);
????????}?catch?(Exception?e)?{
????????????//?日志處理
????????????e.printStackTrace();
????????}

????????//?間隔
????????int?interval?=?-5;
????????//?獲取水印文字的高度和寬度
????????int?textH?=?0,?textW?=?0;
????????JLabel?label?=?new?JLabel();
????????label.setText(waterMarkName);
????????FontMetrics?metrics?=?label.getFontMetrics(label.getFont());
????????textH?=?metrics.getHeight();
????????textW?=?metrics.stringWidth(label.getText());
????????System.out.println("textH:?"?+?textH);
????????System.out.println("textW:?"?+?textW);

????????//?設(shè)置水印透明度
????????PdfGState?gs?=?new?PdfGState();
????????gs.setFillOpacity(0.4f);
????????gs.setStrokeOpacity(0.4f);

????????Rectangle?pageSizeWithRotation?=?null;
????????PdfContentByte?content?=?null;
????????for?(int?i?=?1;?i?<p>Result display: </p><p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/image/266/263/910/1615519548460168.png" class="lazy" title="1615519548460168.png" alt="Java implements adding image watermarks and text watermarks"></p><p>Supplementary information: Regarding itext adding italic font watermark</p><p>The above uses BaseFont and cannot add styles. Font can add styles, but the setFontAndSize method does not accept the Font parameter. So we can only work around it: </p><p>For example: generate an oblique watermark in the lower right corner of each page</p><pre class="brush:php;toolbar:false">package?cn.xm.exam.test;

import?java.io.BufferedOutputStream;
import?java.io.File;
import?java.io.FileOutputStream;
import?java.io.IOException;

import?com.itextpdf.text.DocumentException;
import?com.itextpdf.text.Rectangle;
import?com.itextpdf.text.pdf.BaseFont;
import?com.itextpdf.text.pdf.PdfContentByte;
import?com.itextpdf.text.pdf.PdfGState;
import?com.itextpdf.text.pdf.PdfReader;
import?com.itextpdf.text.pdf.PdfStamper;

public?class?TestWaterPrint?{
????public?static?void?main(String[]?args)?throws?DocumentException,?IOException?{
????????//?要輸出的pdf文件
????????BufferedOutputStream?bos?=?new?BufferedOutputStream(new?FileOutputStream(new?File("F:/test2.pdf")));
????????//?將pdf文件先加水印然后輸出
????????setWatermark(bos,?"F:/test.pdf",?"測試user123456789");
????}

????/**
?????*?
?????*?@param?bos輸出文件的位置
?????*?@param?input
?????*????????????原PDF位置
?????*?@param?waterMarkName
?????*????????????頁腳添加水印
?????*?@throws?DocumentException
?????*?@throws?IOException
?????*/
????public?static?void?setWatermark(BufferedOutputStream?bos,?String?input,?String?waterMarkName)
????????????throws?DocumentException,?IOException?{

????????PdfReader?reader?=?new?PdfReader(input);
????????PdfStamper?stamper?=?new?PdfStamper(reader,?bos);

????????//?獲取總頁數(shù)?+1,?下面從1開始遍歷
????????int?total?=?reader.getNumberOfPages()?+?1;
????????//?使用classpath下面的字體庫
????????BaseFont?base?=?null;
????????try?{
????????????base?=?BaseFont.createFont("/calibri.ttf",?BaseFont.IDENTITY_H,?BaseFont.NOT_EMBEDDED);
????????}?catch?(Exception?e)?{
????????????//?日志處理
????????????e.printStackTrace();
????????}

????????//?設(shè)置水印透明度
????????PdfGState?gs?=?new?PdfGState();
????????gs.setFillOpacity(0.4f);
????????gs.setStrokeOpacity(0.4f);

????????PdfContentByte?content?=?null;
????????for?(int?i?=?1;?i?<p>Result display:</p><p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/image/815/871/608/1615519581569493.png" class="lazy" title="1615519581569493.png" alt="Java implements adding image watermarks and text watermarks"></p><p>Related recommendations: <a href="http://ipnx.cn/java/guide/" target="_blank">java introductory tutorial</a></p>

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