blocks|key|369094|text|看看这个方法，它使用PDFBOX库在pdf源码中添加一个水印图像|type|unstyled|depth|inlineStyleRanges|entityRanges|data|369095|/**
+++++*+Coloca+una+imagen+como+marca+de+agua+en+un+pdf+en+una+posiciÃ³n+especifica
+++++*+
+++++*+@param+buffer
+++++*++++++++++++flujo+de+bytes+que+contiene+el+pdf+original
+++++*+
+++++*+@param+imageFileName
+++++*++++++++++++nombre+del+archivo+de+la+imagen+a+colocar
+++++*+
+++++*+@param+x
+++++*++++++++++++posiciÃ³n+x+de+la+imagen+en+el+pdf
+++++*+
+++++*+@param+y
+++++*++++++++++++posiciÃ³n+y+de+la+imagen+en+el+pdf
+++++*+
+++++*+@param+under+
+++++*+determina+si+la+marca+se+pone+encima+o+por+debajo+de+la+factura
+++++*+
+++++*+@return+flujo+de+bytes+resultante+que+contiene+el+pdf+modificado
+++++*+
+++++*+@throws+IOException
+++++*+@throws+DocumentException
+++++*/
++++public+static+byte[]+addWaterMarkImageToPDF(byte[]+buffer,
++++++++++++String+imageFileName,+int+x,+int+y,+boolean+under)+throws+IOException,
++++++++++++DocumentException+{
++++++++logger.debug("Agregando+marca+de+agua:"%2BimageFileName);
++++++++PdfReader+reader+=+new+PdfReader(buffer);
++++++++ByteArrayOutputStream+arrayOutput+=+new+ByteArrayOutputStream();
++++++++OutputStream+output+=+new+BufferedOutputStream(arrayOutput);
++++++++PdfStamper+stamper+=+new+PdfStamper(reader,+output);
++++++++com.lowagie.text.Image+img+=+com.lowagie.text.Image
++++++++++++++++.getInstance(imageFileName);
++++++++img.setAbsolutePosition(x,+y);
++++++++img.scalePercent(SCALE_PER);
++++++++PdfContentByte+pdfContent;
++++++++int+total+=+reader.getNumberOfPages()+%2B+1;
++++++++for+(int+i+=+1;+i+<+total;+i%2B%2B)+{
++++++++++++pdfContent+=+(under)?stamper.getUnderContent(i):
++++++++++++++++stamper.getOverContent(i);
++++++++++++pdfContent.addImage(img);
++++++++}
++++++++stamper.close();
++++++++output.flush();
++++++++output.close();
++++++++return+arrayOutput.toByteArray();
++++}|code-block|syntax|javascript|369096|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Look at this method, whitch add a watermark image in pdf sources using PDFBOX library

<pre><code>/**
 * Coloca una imagen como marca de agua en un pdf en una posiciÃ³n especifica
 * 
 * @param buffer
 * flujo de bytes que contiene el pdf original
 * 
 * @param imageFileName
 * nombre del archivo de la imagen a colocar
 * 
 * @param x
 * posiciÃ³n x de la imagen en el pdf
 * 
 * @param y
 * posiciÃ³n y de la imagen en el pdf
 * 
 * @param under 
 * determina si la marca se pone encima o por debajo de la factura
 * 
 * @return flujo de bytes resultante que contiene el pdf modificado
 * 
 * @throws IOException
 * @throws DocumentException
 */
 public static byte[] addWaterMarkImageToPDF(byte[] buffer,
 String imageFileName, int x, int y, boolean under) throws IOException,
 DocumentException {
 logger.debug("Agregando marca de agua:"+imageFileName);
 PdfReader reader = new PdfReader(buffer);
 ByteArrayOutputStream arrayOutput = new ByteArrayOutputStream();
 OutputStream output = new BufferedOutputStream(arrayOutput);
 PdfStamper stamper = new PdfStamper(reader, output);
 com.lowagie.text.Image img = com.lowagie.text.Image
 .getInstance(imageFileName);
 img.setAbsolutePosition(x, y);
 img.scalePercent(SCALE_PER);
 PdfContentByte pdfContent;
 int total = reader.getNumberOfPages() + 1;
 for (int i = 1; i &lt; total; i++) {
 pdfContent = (under)?stamper.getUnderContent(i):
 stamper.getOverContent(i);
 pdfContent.addImage(img);
 }
 stamper.close();
 output.flush();
 output.close();
 return arrayOutput.toByteArray();
 }
</code></pre>

blocks|key|1389098|text|更新了ANSWER+(更好的版本，提供了简单的水印方法，感谢下面的评论员和@okok提供了他的答案)|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1389099|如果您使用的是PDFBox+1.8.10或更高版本，您可以轻松地添加水印到您的PDF文档，更好地控制哪些页面需要添加水印。假设您有一个带有水印图像的单页PDF文档，您可以将其覆盖在要添加水印的文档上，如下所示。|1389100|使用1.8.10的示例代码|1389101|import+java.util.HashMap;
import+org.apache.pdfbox.pdmodel.PDDocument;
import+org.apache.pdfbox.util.Overlay;

public+class+TestPDF+{
++++public+static+void+main(String[]+args)+throws+Exception{
++++++++++++PDDocument+realDoc+=+PDDocument.load("originaldocument.pdf");+
++++++++++++//the+above+is+the+document+you+want+to+watermark+++++++++++++++++++

++++++++++++//for+all+the+pages,+you+can+add+overlay+guide,+indicating+watermark+the+original+pages+with+the+watermark+document.
++++++++++++HashMap<Integer,+String>+overlayGuide+=+new+HashMap<Integer,+String>();
++++++++++++for(int+i=0;+i<realDoc.getPageCount();+i%2B%2B){
++++++++++++++++overlayGuide.put(i%2B1,+"watermark.pdf");
++++++++++++++++//watermark.pdf+is+the+document+which+is+a+one+page+PDF+with+your+watermark+image+in+it.+Notice+here+that+you+can+skip+pages+from+being+watermarked.
++++++++++++}
++++++++++++Overlay+overlay+=+new+Overlay();
++++++++++++overlay.setInputPDF(realDoc);
++++++++++++overlay.setOutputFile("final.pdf");
++++++++++++overlay.setOverlayPosition(Overlay.Position.BACKGROUND);
++++++++++++overlay.overlay(overlayGuide,false);
+++++++++++//final.pdf+will+have+the+original+PDF+with+watermarks.|code-block|syntax|javascript|1389102|使用PDFBox+2.0.0候选版本的示例|1389103|import+java.io.File;
import+java.util.HashMap;
import+org.apache.pdfbox.multipdf.Overlay;
import+org.apache.pdfbox.pdmodel.PDDocument;

public+class+TestPDF+{

++++public+static+void+main(String[]+args)+throws+Exception{++++++++
++++++++PDDocument+realDoc+=+PDDocument.load(new+File("originaldocument.pdf"));
++++++++//the+above+is+the+document+you+want+to+watermark
++++++++//for+all+the+pages,+you+can+add+overlay+guide,+indicating+watermark+the+original+pages+with+the+watermark+document.

++++++++HashMap<Integer,+String>+overlayGuide+=+new+HashMap<Integer,+String>();
++++++++for(int+i=0;+i<realDoc.getNumberOfPages();+i%2B%2B){
++++++++++++overlayGuide.put(i%2B1,+"watermark.pdf");
++++++++++++//watermark.pdf+is+the+document+which+is+a+one+page+PDF+with+your+watermark+image+in+it.+
++++++++++++//Notice+here,+you+can+skip+pages+from+being+watermarked.
++++++++}
++++++++Overlay+overlay+=+new+Overlay();
++++++++overlay.setInputPDF(realDoc);
++++++++overlay.setOutputFile("final.pdf");
++++++++overlay.setOverlayPosition(Overlay.Position.BACKGROUND);
++++++++overlay.overlay(overlayGuide);++++++
++++}
}|1389104|如果你想使用新的覆盖包org.apache.pdfbox.tools.OverlayPDF，你可以这样做。(感谢下面的海报)|1389105|String[]+overlayArgs+=+{"C:/Examples/foreground.pdf",+"C:/Examples/background.pdf",+"C:/Examples/resulting.pdf"};
OverlayPDF.main(overlayArgs);
System.out.println("Overlay+finished.");|1389106|1389107|老答案效率低的方式，不推荐。|1389108|好的，OP询问如何在PDFBox中做到这一点，第一个答案看起来像使用iText的示例。在PDFBox中创建水印非常简单。诀窍是，您应该有一个带有水印图像的空PDF文档。然后，您所要做的就是将此水印文档覆盖在要添加水印的文档上。|1389109|PDDocument+watermarkDoc+=+PDDocument.load("watermark.pdf");
//Assuming+your+empty+document+with+watermark+image+in+it.

PDDocument+realDoc+=+PDDocument.load("document-to-be-watermarked.pdf");
//Let's+say+this+is+your+document+that+you+want+to+watermark.+For+example+sake,+I+am+opening+a+new+one,+you+would+already+have+a+reference+to+PDDocument+if+you+are+creating+one

Overlay+overlay+=+new+Overlay();
overlay.overlay(realDoc,watermarkDoc);
watermarkDoc.save("document-now-watermarked.pdf");|1389110|注意:您应该确保两个document..Otherwise中的页数匹配，否则最终将得到一个页数与页数最少的文档相匹配的文档。您可以操作水印文档并复制页面以匹配您的文档。|1389111|希望这能帮上忙！|1389112|entityMap^0|0|9|0|0|0|0|0|0|0|0|0|0|3|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1C|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1D|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1E|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1F|8|@]|D|@]|E|$]]|$1|Q|3|R|5|L|7|1G|8|@]|D|@]|E|$M|N]]|$1|S|3|T|5|6|7|1H|8|@]|D|@]|E|$]]|$1|U|3|V|5|L|7|1I|8|@]|D|@]|E|$M|N]]|$1|W|3|-4|5|6|7|1J|8|@]|D|@]|E|$]]|$1|X|3|Y|5|6|7|1K|8|@$9|1L|A|1M|B|C]]|D|@]|E|$]]|$1|Z|3|10|5|6|7|1N|8|@]|D|@]|E|$]]|$1|11|3|12|5|L|7|1O|8|@]|D|@]|E|$M|N]]|$1|13|3|14|5|6|7|1P|8|@]|D|@]|E|$]]|$1|15|3|16|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|17|3|-4|5|6|7|1R|8|@]|D|@]|E|$]]]|18|$]]

UPDATED ANSWER (Better version with easy way to watermark, thanks to the commentators below and @okok who provided input with his answer)

If you are using PDFBox 1.8.10 or above, you can add watermark to your PDF document easily with better control over what pages needs to be watermarked. Assuming you have a one page PDF document that has the watermark image, you can overlay this on the document you want to watermark as follows. 

Sample Code using 1.8.10

<pre><code>import java.util.HashMap;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.util.Overlay;

public class TestPDF {
 public static void main(String[] args) throws Exception{
 PDDocument realDoc = PDDocument.load("originaldocument.pdf"); 
 //the above is the document you want to watermark 

 //for all the pages, you can add overlay guide, indicating watermark the original pages with the watermark document.
 HashMap&lt;Integer, String&gt; overlayGuide = new HashMap&lt;Integer, String&gt;();
 for(int i=0; i&lt;realDoc.getPageCount(); i++){
 overlayGuide.put(i+1, "watermark.pdf");
 //watermark.pdf is the document which is a one page PDF with your watermark image in it. Notice here that you can skip pages from being watermarked.
 }
 Overlay overlay = new Overlay();
 overlay.setInputPDF(realDoc);
 overlay.setOutputFile("final.pdf");
 overlay.setOverlayPosition(Overlay.Position.BACKGROUND);
 overlay.overlay(overlayGuide,false);
 //final.pdf will have the original PDF with watermarks.
</code></pre>

Sample using PDFBox 2.0.0 Release candidate

<pre><code>import java.io.File;
import java.util.HashMap;
import org.apache.pdfbox.multipdf.Overlay;
import org.apache.pdfbox.pdmodel.PDDocument;

public class TestPDF {

 public static void main(String[] args) throws Exception{ 
 PDDocument realDoc = PDDocument.load(new File("originaldocument.pdf"));
 //the above is the document you want to watermark
 //for all the pages, you can add overlay guide, indicating watermark the original pages with the watermark document.

 HashMap&lt;Integer, String&gt; overlayGuide = new HashMap&lt;Integer, String&gt;();
 for(int i=0; i&lt;realDoc.getNumberOfPages(); i++){
 overlayGuide.put(i+1, "watermark.pdf");
 //watermark.pdf is the document which is a one page PDF with your watermark image in it. 
 //Notice here, you can skip pages from being watermarked.
 }
 Overlay overlay = new Overlay();
 overlay.setInputPDF(realDoc);
 overlay.setOutputFile("final.pdf");
 overlay.setOverlayPosition(Overlay.Position.BACKGROUND);
 overlay.overlay(overlayGuide); 
 }
}
</code></pre>

If you want to use the new package org.apache.pdfbox.tools.OverlayPDF for overlays you can do this way. (Thanks the poster below)

<pre><code>String[] overlayArgs = {"C:/Examples/foreground.pdf", "C:/Examples/background.pdf", "C:/Examples/resulting.pdf"};
OverlayPDF.main(overlayArgs);
System.out.println("Overlay finished.");
</code></pre>

<hr>

OLD ANSWER Inefficient way, not recommended.

Well, OP asked how to do it in PDFBox, the first answer looks like an example using iText. Creating a watermark in PDFBox is really simple. The trick is, you should have an empty PDF document with the watermark image. Then all you have to do is Overlay this watermark document on the document that you want to add the watermark to.

<pre><code>PDDocument watermarkDoc = PDDocument.load("watermark.pdf");
//Assuming your empty document with watermark image in it.

PDDocument realDoc = PDDocument.load("document-to-be-watermarked.pdf");
//Let's say this is your document that you want to watermark. For example sake, I am opening a new one, you would already have a reference to PDDocument if you are creating one

Overlay overlay = new Overlay();
overlay.overlay(realDoc,watermarkDoc);
watermarkDoc.save("document-now-watermarked.pdf");
</code></pre>

Caution: You should make sure you match the number of pages in both document..Otherwise, you would end up with a document with number of pages matching the one which has least number of pages. You can manipulate the watermark document and duplicate the pages to match your document.

Hope this helps.!

blocks|key|4312859|text|我刚写了这段代码，用pdfbox把(透明的)图片(jpg，png，gif)添加到pdf页面：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4312860|/**
+*+Draw+an+image+to+the+specified+coordinates+onto+a+single+page.+ 
+*+Also+scaled+the+image+with+the+specified+factor.
+*+
+*+@author+Nick+Russler
+*+@param+document+PDF+document+the+image+should+be+written+to.
+*+@param+pdfpage+Page+number+of+the+page+in+which+the+image+should+be+written+to.
+*+@param+x+X+coordinate+on+the+page+where+the+left+bottom+corner+of+the+image+should+be+located.+Regard+that+0+is+the+left+bottom+of+the+pdf+page.
+*+@param+y+Y+coordinate+on+the+page+where+the+left+bottom+corner+of+the+image+should+be+located.
+*+@param+scale+Factor+used+to+resize+the+image.
+*+@param+imageFilePath+Filepath+of+the+image+that+is+written+to+the+PDF.
+*+@throws+IOException
+*/
public+static+void+addImageToPage(PDDocument+document,+int+pdfpage,+int+x,+int+y,+float+scale,+String+imageFilePath)+throws+IOException+{+++
++++//+Convert+the+image+to+TYPE_4BYTE_ABGR+so+PDFBox+won't+throw+exceptions+(e.g.+for+transparent+png's).
++++BufferedImage+tmp_image+=+ImageIO.read(new+File(imageFilePath));
++++BufferedImage+image+=+new+BufferedImage(tmp_image.getWidth(),+tmp_image.getHeight(),+BufferedImage.TYPE_4BYTE_ABGR);++++++++
++++image.createGraphics().drawRenderedImage(tmp_image,+null);

++++PDXObjectImage+ximage+=+new+PDPixelMap(document,+image);

++++PDPage+page+=+(PDPage)document.getDocumentCatalog().getAllPages().get(pdfpage);

++++PDPageContentStream+contentStream+=+new+PDPageContentStream(document,+page,+true,+true);
++++contentStream.drawXObject(ximage,+x,+y,+ximage.getWidth()*scale,+ximage.getHeight()*scale);
++++contentStream.close();
}|code-block|syntax|javascript|4312861|示例：|4312862|public+static+void+main(String[]+args)+throws+Exception+{
++++String+pdfFilePath+=+"C:/Users/Nick/Desktop/pdf-test.pdf";
++++String+signatureImagePath+=+"C:/Users/Nick/Desktop/signature.png";
++++int+page+=+0;

++++PDDocument+document+=+PDDocument.load(pdfFilePath);

++++addImageToPage(document,+page,+0,+0,+0.5f,+signatureImagePath);

++++document.save("C:/Users/Nick/Desktop/pdf-test-neu.pdf");
}|4312863|这适用于jdk+1.7和bcmail-jdk16-140.jar、bcprov-jdk16-140.jar、commons-logging-1.1.3.jar、fontbox-1.8.3.jar、jempbox-1.8.3.jar和pdfbox-1.8.3.jar。|4312864|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Just made this piece of code to add (transparent) images (jpg, png, gif) to a pdf page with pdfbox:

<pre><code>/**
 * Draw an image to the specified coordinates onto a single page. &lt;br&gt;
 * Also scaled the image with the specified factor.
 * 
 * @author Nick Russler
 * @param document PDF document the image should be written to.
 * @param pdfpage Page number of the page in which the image should be written to.
 * @param x X coordinate on the page where the left bottom corner of the image should be located. Regard that 0 is the left bottom of the pdf page.
 * @param y Y coordinate on the page where the left bottom corner of the image should be located.
 * @param scale Factor used to resize the image.
 * @param imageFilePath Filepath of the image that is written to the PDF.
 * @throws IOException
 */
public static void addImageToPage(PDDocument document, int pdfpage, int x, int y, float scale, String imageFilePath) throws IOException { 
 // Convert the image to TYPE_4BYTE_ABGR so PDFBox won't throw exceptions (e.g. for transparent png's).
 BufferedImage tmp_image = ImageIO.read(new File(imageFilePath));
 BufferedImage image = new BufferedImage(tmp_image.getWidth(), tmp_image.getHeight(), BufferedImage.TYPE_4BYTE_ABGR); 
 image.createGraphics().drawRenderedImage(tmp_image, null);

 PDXObjectImage ximage = new PDPixelMap(document, image);

 PDPage page = (PDPage)document.getDocumentCatalog().getAllPages().get(pdfpage);

 PDPageContentStream contentStream = new PDPageContentStream(document, page, true, true);
 contentStream.drawXObject(ximage, x, y, ximage.getWidth()*scale, ximage.getHeight()*scale);
 contentStream.close();
}
</code></pre>

Example:

<pre><code>public static void main(String[] args) throws Exception {
 String pdfFilePath = "C:/Users/Nick/Desktop/pdf-test.pdf";
 String signatureImagePath = "C:/Users/Nick/Desktop/signature.png";
 int page = 0;

 PDDocument document = PDDocument.load(pdfFilePath);

 addImageToPage(document, page, 0, 0, 0.5f, signatureImagePath);

 document.save("C:/Users/Nick/Desktop/pdf-test-neu.pdf");
}
</code></pre>

This worked for me with jdk 1.7 and bcmail-jdk16-140.jar, bcprov-jdk16-140.jar, commons-logging-1.1.3.jar, fontbox-1.8.3.jar, jempbox-1.8.3.jar and pdfbox-1.8.3.jar.

blocks|key|1385940|text|在util包中还有另一个overlay类，它使您不必创建与源文档具有相同页数的pdf，然后再进行覆盖。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1385941|要了解它的用法，可以查看pdfbox源代码，特别是OverlayPDF类。|1385942|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

There is another Overlay class within util package, that saves you from creating a pdf with same number of pages as the source document and then doing the overlay.

To understand its usage, take a look at pdfbox source code, specifically the OverlayPDF class.

blocks|key|272216|text|@Androidman+:添加到https://stackoverflow.com/a/9382212/7802973|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|272217|似乎每个版本的PDFBox都删除了很多方法。因此该代码将不能在PDFBox+2.0.7上工作。|272218|Overlay+overlay+=+new+Overlay();
overlay.setInputPDF(realDoc);
//+**+The+method+setOutputFile(String)+is+undefined+for+the+type+Overlay+**+
overlay.setOutputFile("final.pdf")|code-block|syntax|javascript|272219|相反，我认为应该使用void+org.apache.pdfbox.pdmodel.PDDocument.save(String+fileName)：|style|CODE|272220|PDDocument+realDoc+=+PDDocument.load(new+File("originaldocument.pdf"));
++++//the+above+is+the+document+you+want+to+watermark
++++//for+all+the+pages,+you+can+add+overlay+guide,+indicating+watermark+the+original+pages+with+the+watermark+document.

HashMap<Integer,+String>+overlayGuide+=+new+HashMap<Integer,+String>();
++++for(int+i=0;+i<realDoc.getNumberOfPages();+i%2B%2B){
++++++++overlayGuide.put(i%2B1,+"watermark.pdf");
++++++++//watermark.pdf+is+the+document+which+is+a+one+page+PDF+with+your+watermark+image+in+it.+
++++++++//Notice+here,+you+can+skip+pages+from+being+watermarked.
++++}
Overlay+overlay+=+new+Overlay();
overlay.setInputPDF(realDoc);
overlay.overlay(overlayGuide).save("final.pdf");
overlay.close();|272221|272222|编辑：我现在正在使用org.apache.pdfbox.tools.OverlayPDF进行覆盖，它工作得很好。代码如下所示：|BOLD|272223|String[]+overlayArgs+=+{"C:/Examples/foreground.pdf",+"C:/Examples/background.pdf",+"C:/Examples/resulting.pdf"};
OverlayPDF.main(overlayArgs);
System.out.println("Overlay+finished.");|272224|272225|由于我没有足够的名气来添加评论，我认为在新的答案中添加这一点是合适的。|272226|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/9382212/7802973^0|G|17|0|0|0|0|A|1R|0|0|0|0|3|A|Y|0|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@]|9|@$A|18|B|19|1|1A]]|C|$]]|$1|D|3|E|5|6|7|1B|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1C|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1D|8|@$A|1E|B|1F|M|N]]|9|@]|C|$]]|$1|O|3|P|5|H|7|1G|8|@]|9|@]|C|$I|J]]|$1|Q|3|-4|5|6|7|1H|8|@]|9|@]|C|$]]|$1|R|3|S|5|6|7|1I|8|@$A|1J|B|1K|M|T]|$A|1L|B|1M|M|N]]|9|@]|C|$]]|$1|U|3|V|5|H|7|1N|8|@]|9|@]|C|$I|J]]|$1|W|3|-4|5|6|7|1O|8|@]|9|@]|C|$]]|$1|X|3|Y|5|6|7|1P|8|@]|9|@]|C|$]]|$1|Z|3|-4|5|6|7|1Q|8|@]|9|@]|C|$]]]|10|$11|$5|12|13|14|C|$15|16]]]]

@Androidman : Addition to <a href="https://stackoverflow.com/a/9382212/7802973">https://stackoverflow.com/a/9382212/7802973</a>

It seems like many methods are removed with each version of PDFBox. So that code will not work on PDFBox 2.0.7.

<pre><code>Overlay overlay = new Overlay();
overlay.setInputPDF(realDoc);
// ** The method setOutputFile(String) is undefined for the type Overlay ** 
overlay.setOutputFile("final.pdf")
</code></pre>

Instead, use <code>void org.apache.pdfbox.pdmodel.PDDocument.save(String fileName)</code>, I think:

<pre><code>PDDocument realDoc = PDDocument.load(new File("originaldocument.pdf"));
 //the above is the document you want to watermark
 //for all the pages, you can add overlay guide, indicating watermark the original pages with the watermark document.

HashMap&lt;Integer, String&gt; overlayGuide = new HashMap&lt;Integer, String&gt;();
 for(int i=0; i&lt;realDoc.getNumberOfPages(); i++){
 overlayGuide.put(i+1, "watermark.pdf");
 //watermark.pdf is the document which is a one page PDF with your watermark image in it. 
 //Notice here, you can skip pages from being watermarked.
 }
Overlay overlay = new Overlay();
overlay.setInputPDF(realDoc);
overlay.overlay(overlayGuide).save("final.pdf");
overlay.close();
</code></pre>

<hr>

Edit:
I am using <code>org.apache.pdfbox.tools.OverlayPDF</code> for overlays now and it works just fine. The code looks like this:

<pre><code>String[] overlayArgs = {"C:/Examples/foreground.pdf", "C:/Examples/background.pdf", "C:/Examples/resulting.pdf"};
OverlayPDF.main(overlayArgs);
System.out.println("Overlay finished.");
</code></pre>

<hr>

As I had not enough reputation to add a comment, I thought it'd be appropiate to add this in a new answer.

blocks|key|1389217|text|这就是我在C#中使用PdfBox+2.0.x添加带有日期的文本水印的方法。它将水印放在页面顶部的中心。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1389218|public+static+void+AddWatermark(string+fileName)
++++++++{
++++++++++++StringBuilder+sb+=+new+StringBuilder();
++++++++++++sb.Append("watermark_text++");
++++++++++++sb.Append(DateTime.Now.ToString());

++++++++++++string+waterMarkText+=+sb.ToString();

++++++++++++PDDocument+origDoc+=+PDDocument.load(new+java.io.File(fileName));
++++++++++++PDPageTree+allPages+=+origDoc.getPages();
++++++++++++PDFont+font+=+PDType1Font.HELVETICA_BOLD;
++++++++++++for+(int+i+=+0,+len+=+allPages.getCount();+i+<+len;+%2B%2Bi)
++++++++++++{
++++++++++++++++PDPage+pg+=+(PDPage)allPages.get(i);

++++++++++++++++AddWatermarkText(origDoc,+pg,+font,+waterMarkText);
++++++++++++}

++++++++++++origDoc.save(fileName);
++++++++++++origDoc.close();
++++++++}

static+void+AddWatermarkText(PDDocument+doc,+PDPage+page,+PDFont+font,+string+text)
++++++++{
++++++++++++using+(PDPageContentStream+cs+=+new+PDPageContentStream(doc,+page,+PDPageContentStream.AppendMode.APPEND,+true,+true))
++++++++++++{
++++++++++++++++float+fontHeight+=+30;
++++++++++++++++float+width+=+page.getMediaBox().getWidth();
++++++++++++++++float+height+=+page.getMediaBox().getHeight();
++++++++++++++++float+stringWidth+=+font.getStringWidth(text)+/+1000+*+fontHeight;

++++++++++++++++float+x+=+(width+/+2)+-+(stringWidth+/+2);
++++++++++++++++float+y+=+height+-+25;

++++++++++++++++cs.setFont(font,+fontHeight);

++++++++++++++++PDExtendedGraphicsState+gs+=+new+PDExtendedGraphicsState();
++++++++++++++++gs.setNonStrokingAlphaConstant(new+java.lang.Float(0.2f));
++++++++++++++++gs.setStrokingAlphaConstant(new+java.lang.Float(0.2f));
++++++++++++++++gs.setBlendMode(BlendMode.MULTIPLY);
++++++++++++++++gs.setLineWidth(new+java.lang.Float(3f));
++++++++++++++++cs.setGraphicsStateParameters(gs);

++++++++++++++++cs.setNonStrokingColor(Color.red);
++++++++++++++++cs.setStrokingColor(Color.red);

++++++++++++++++cs.beginText();
++++++++++++++++cs.newLineAtOffset(x,+y);
++++++++++++++++cs.showText(text);
++++++++++++++++cs.endText();
++++++++++++}
++++++++}|code-block|syntax|javascript|1389219|pdfbox+c#+watermark+pdf|offset|length|1389220|entityMap|0|LINK|mutability|MUTABLE|url|/questions/tagged/pdfbox|1|/questions/tagged/c%2523|2|/questions/tagged/watermark|3|/questions/tagged/pdf^0|0|0|0|6|0|7|2|1|A|9|2|K|3|3|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@$I|11|J|12|1|13]|$I|14|J|15|1|16]|$I|17|J|18|1|19]|$I|1A|J|1B|1|1C]]|A|$]]|$1|K|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]|S|$5|N|O|P|A|$Q|T]]|U|$5|N|O|P|A|$Q|V]]|W|$5|N|O|P|A|$Q|X]]]]

This is how I was able to add a text watermark with the date using PdfBox 2.0.x in C#. It centres the watermark at the top of the page.
<pre><code>public static void AddWatermark(string fileName)
 {
 StringBuilder sb = new StringBuilder();
 sb.Append(&quot;watermark_text &quot;);
 sb.Append(DateTime.Now.ToString());

 string waterMarkText = sb.ToString();

 PDDocument origDoc = PDDocument.load(new java.io.File(fileName));
 PDPageTree allPages = origDoc.getPages();
 PDFont font = PDType1Font.HELVETICA_BOLD;
 for (int i = 0, len = allPages.getCount(); i &lt; len; ++i)
 {
 PDPage pg = (PDPage)allPages.get(i);

 AddWatermarkText(origDoc, pg, font, waterMarkText);
 }

 origDoc.save(fileName);
 origDoc.close();
 }

static void AddWatermarkText(PDDocument doc, PDPage page, PDFont font, string text)
 {
 using (PDPageContentStream cs = new PDPageContentStream(doc, page, PDPageContentStream.AppendMode.APPEND, true, true))
 {
 float fontHeight = 30;
 float width = page.getMediaBox().getWidth();
 float height = page.getMediaBox().getHeight();
 float stringWidth = font.getStringWidth(text) / 1000 * fontHeight;

 float x = (width / 2) - (stringWidth / 2);
 float y = height - 25;

 cs.setFont(font, fontHeight);

 PDExtendedGraphicsState gs = new PDExtendedGraphicsState();
 gs.setNonStrokingAlphaConstant(new java.lang.Float(0.2f));
 gs.setStrokingAlphaConstant(new java.lang.Float(0.2f));
 gs.setBlendMode(BlendMode.MULTIPLY);
 gs.setLineWidth(new java.lang.Float(3f));
 cs.setGraphicsStateParameters(gs);

 cs.setNonStrokingColor(Color.red);
 cs.setStrokingColor(Color.red);

 cs.beginText();
 cs.newLineAtOffset(x, y);
 cs.showText(text);
 cs.endText();
 }
 }
</code></pre>
<a href="/questions/tagged/pdfbox" class="post-tag" title="show questions tagged &#39;pdfbox&#39;" rel="tag">pdfbox</a> <a href="/questions/tagged/c%23" class="post-tag" title="show questions tagged &#39;c#&#39;" rel="tag">c#</a> <a href="/questions/tagged/watermark" class="post-tag" title="show questions tagged &#39;watermark&#39;" rel="tag">watermark</a> <a href="/questions/tagged/pdf" class="post-tag" title="show questions tagged &#39;pdf&#39;" rel="tag">pdf</a>

blocks|key|1389233|text|@Droidman补充说，如果你使用2.0.21或更高版本，你可以直接覆盖在PDDocument上。示例代码如下。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1389234|PDDocument+realDoc+=+pdfGenerator.getDocument();+
HashMap<Integer,+PDDocument>+overlayGuide+=+new+HashMap<>();+
for+(int+i+=+0;+i+<+realDoc.getNumberOfPages();+i%2B%2B)+{+
+++overlayGuide.put(i+%2B+1,+document);+
}+
Overlay+overlay+=+new+Overlay();+
overlay.setInputPDF(realDoc);+
overlay.setOverlayPosition(Overlay.Position.BACKGROUND);+
overlay.overlayDocuments(overlayGuide);|code-block|syntax|javascript|1389235|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Adding to the answer by @Droidman If your using version 2.0.21 and above you can directly overlay on PDDocument. Sample code as follows.
<pre><code>PDDocument realDoc = pdfGenerator.getDocument(); 
HashMap&lt;Integer, PDDocument&gt; overlayGuide = new HashMap&lt;&gt;(); 
for (int i = 0; i &lt; realDoc.getNumberOfPages(); i++) { 
 overlayGuide.put(i + 1, document); 
} 
Overlay overlay = new Overlay(); 
overlay.setInputPDF(realDoc); 
overlay.setOverlayPosition(Overlay.Position.BACKGROUND); 
overlay.overlayDocuments(overlayGuide);
</code></pre>

I am trying to add a watermark to a PDF specifically with PDFBox. I've been able to get the image to appear on each page, but it loses the background transparency because it appears as though PDJpeg converts it to a JPG. Perhaps there's a way to do it using PDXObjectImage.

Here is what I have written thus far:

<pre><code>public static void watermarkPDF(PDDocument pdf) throws IOException
{
 // Load watermark
 BufferedImage buffered = ImageIO.read(new File("C:\\PDF_Test\\watermark.png"));
 PDJpeg watermark = new PDJpeg(pdf, buffered);

 // Loop through pages in PDF
 List pages = pdf.getDocumentCatalog().getAllPages();
 Iterator iter = pages.iterator();
 while(iter.hasNext())
 {
 PDPage page = (PDPage)iter.next();

 // Add watermark to individual page
 PDPageContentStream stream = new PDPageContentStream(pdf, page, true, false);
 stream.drawImage(watermark, 100, 0);
 stream.close();
 }

 try 
 {
 pdf.save("C:\\PDF_Test\\watermarktest.pdf");
 } 
 catch (COSVisitorException e) 
 {
 e.printStackTrace();
 }
}
</code></pre>

Watermarking with PDFBox

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试添加一个水印的PDF格式，特别是与PDFBox。我已经能够让图像出现在每个页面上，但它失去了背景透明度，因为它看起来像是PDJpeg将其转换为JPG格式。也许有一种方法可以使用PDXObjectImage来实现。到目前为止，我写了以下内容：public static void watermarkPDF(PDD...

问使用PDFBox添加水印
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