iText中给pdf内容添加水印

1. /**
2. *给pdf文件添加水印
3. *@paramInPdfFile要加水印的原pdf文件路径
4. *@paramoutPdfFile加了水印后要输出的路径
5. *@parammarkImagePath水印图片路径
6. *@parampageSize原pdf文件的总页数
7. *@throwsException
8. */
9. publicstaticvoidaddPdfMark(StringInPdfFile,StringoutPdfFile,StringmarkImagePath,intpageSize)throwsException{
11. PdfReaderreader=newPdfReader(InPdfFile,"PDF".getBytes());
13. PdfStamperstamp=newPdfStamper(reader,newFileOutputStream(outPdfFile));
15. Imageimg=Image.getInstance(markImagePath);//插入水印
17. img.setAbsolutePosition(150,100);
19. for(inti=1;i<=pageSize;i++){
21. PdfContentByteunder=stamp.getUnderContent(i);
23. under.addImage(img);
25. }
27. stamp.close();//关闭
29. Filetempfile=newFile(InPdfFile);
31. if(tempfile.exists()){
33. tempfile.delete();
34. }
36. }

 /**
 * 给pdf文件添加水印
 * @param InPdfFile 要加水印的原pdf文件路径
 * @param outPdfFile 加了水印后要输出的路径
 * @param markImagePath 水印图片路径
 * @param pageSize 原pdf文件的总页数
 * @throws Exception
 */
 public static void addPdfMark(String InPdfFile, String outPdfFile, String markImagePath, int pageSize) throws Exception {
 
 PdfReader reader = new PdfReader(InPdfFile, "PDF".getBytes());
 
 PdfStamper stamp = new PdfStamper(reader, new FileOutputStream(outPdfFile));
 
 Image img = Image.getInstance(markImagePath);// 插入水印 

 img.setAbsolutePosition(150, 100);
 
 for(int i = 1; i <= pageSize; i++) {
 
 PdfContentByte under = stamp.getUnderContent(i);
 
 under.addImage(img);
 
 }
 
 stamp.close();// 关闭 
 
 File tempfile = new File(InPdfFile);
 
 if(tempfile.exists()) {
 
 tempfile.delete();
 }
 

 }

转自：http://blog.youkuaiyun.com/huiwenjie168/article/details/7616983