import com.itextpdf.text.Document;  
import com.itextpdf.text.DocumentException;  
import com.itextpdf.text.Font;  
import com.itextpdf.text.Paragraph;  
import com.itextpdf.text.pdf.BaseFont;  
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.pdf.PdfWriter; 
import com.itextpdf.text.DocumentException;  
import com.itextpdf.text.pdf.BaseFont;  
import com.itextpdf.text.pdf.PdfContentByte;  
import com.itextpdf.text.pdf.PdfReader;  
import com.itextpdf.text.pdf.PdfStamper;

public static final String CHARACTOR_FONT_CH_FILE = "SIMHEI.TTF";  //黑体常规 

public static void AddWaterMark(String filename,String outPutFile,String waterText,
   String pdfTitle,String Subject,String Keywords,String Creator,
   String Author) throws  DocumentException,IOException{
  PdfReader.unethicalreading = true; 
  // 待加水印的文件  
        PdfReader reader = new PdfReader(filename);        
        // 加完水印的文件  
        PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(outPutFile));  
        
        HashMap<STRING, String> info = reader.getInfo();
        info.put("Title", pdfTitle);
        info.put("Subject", Subject);
        info.put("Keywords", Keywords);
        info.put("Creator", Creator);
        info.put("Author", Author);
        stamper.setMoreInfo(info);
        
        int total = reader.getNumberOfPages() + 1;   
        PdfContentByte content;  
        // 设置字体 
        BaseFont base = BaseFont.createFont(CHARACTOR_FONT_CH_FILE,BaseFont.IDENTITY_H, BaseFont.EMBEDDED);        
        int j = waterText.length(); // 文字长度
        char c = 0;  
        int high = 0;// 高度  
        // 循环对每页插入水印  
        for (int i = 1; i < total; i++) {  
            // 水印的起始  
            high = 500;  
            content = stamper.getUnderContent(i);  
            // 开始  
            content.beginText();  
            // 设置颜色  
            content.setColorFill(BaseColor.RED);
            // 设置字体及字号  
            content.setFontAndSize(base, 18);  
            // 设置起始位置  
            content.setTextMatrix(0, 0);  
            // 开始写入水印  
            for (int k = 0; k < j; k++) {  
                content.setTextRise(14);  
                c = waterText.charAt(k);  
                // 将char转成字符串  
                content.showText(c + "");  
                high -= 5;  
            }  
            content.endText();  
  
        }  
                
        stamper.close(); 
        
 }

public static void main(String args[]){
  try{
            PDDocument document = PDDocument.load(musiqueFileName);
            List<?> pages = doc.getDocumentCatalog().getAllPages();
            PDPage page = (PDPage) pages.get(0);  //给第一页加水印，如果需要全部加，那么循环即可
            //创建有个输出流,注意第3个参数必须为true，
            PDPageContentStream contentStream = new PDPageContentStream(document, page,true,true);             
            //加文字水印
            contentStream.beginText();
            contentStream.setFont( PDType1Font.TIMES_ITALIC, 12f );
            contentStream.moveTextPositionByAmount( 10,10 );
            String msg = "Hello World";
            contentStream.drawString(msg);
            contentStream.endText();

             //加图片水印
             String image = "D:/img.jpg";
             PDXObjectImage ximage = null;
             if( image.toLowerCase().endsWith( ".jpg" ) )
             {
                 ximage = new PDJpeg(document, new FileInputStream( image ) );
             }
             else if (image.toLowerCase().endsWith(".tif") || image.toLowerCase().endsWith(".tiff"))
             {
                 ximage = new PDCcitt(document, new RandomAccessFile(new File(image),"r"));              
             }
             else
             {
                 throw new IOException( "Image type not supported:" + image );
             }            
                        
            contentStream.drawImage( ximage, 0, 0);
            contentStream.close();  //这一句很重要，不关闭将无法写入
            document.save("C:/lucene/Test.pdf");
            document.close();            
   }
  catch (Exception e){
   
   System.out.println(e.getMessage());
  }
 }