javapdf加水印的方法

 com.itextpdf.tool
 xmlworker
 5.5.10


 com.itextpdf
 itextpdf
 5.5.10

/**
  * pdf 加水印
  *
  * @return
  */
 public byte[] pdfAddWaterMark(byte[] byes) {

  String fileName = UUID.randomUUID().toString() + ".pdf";
  String courseFile = "";
  try {
   // 第二种：获取项目路径 D:\git\daotie\daotie
   //生成临时文件 , 读取完删除
   File directory = new File("");// 参数为空
   courseFile = directory.getCanonicalPath() + "/";
  } catch (IOException e) {
   e.printStackTrace();
  }
  byte[] returnBytes = null;
  // 待加水印的文件
  PdfReader reader = null;
  PdfStamper stamper = null;
//  ByteArrayOutputStream baos = null;
  FileOutputStream os = null;
  try {
   reader = new PdfReader(byes);
   // 加完水印的文件
//   baos = new ByteArrayOutputStream();
//   stamper = new PdfStamper(reader, baos);
   // 加完水印的文件
   os = new FileOutputStream(courseFile + fileName);
   stamper = new PdfStamper(reader, os);

   int total = reader.getNumberOfPages() + 1;
   PdfContentByte content;
   // BaseFont fOnt= BaseFont.createFont();
   BaseFont basefOnt= BaseFont.createFont("/static/fonts/SIMYOU.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
   //这里的字体设置比较关键，这个设置是支持中文的写法
   /*BaseFont base = BaseFont.createFont("STSong-Light",
     "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);// 使用系统字体*/

   /*//设置透明度
   PdfGState gs = new PdfGState();
   gs.setFillOpacity(1f);
   gs.setStrokeOpacity(1f);*/

   PdfContentByte under;
   com.itextpdf.text.Rectangle pageRect = null;

   // 循环对每页插入水印
   for (int i = 1; i