private void ReadPdf() 
        {
            PDDocument pdoc = new PDDocument();
            pdoc = PDDocument.load("d:\\Test01.pdf");
            pdoc.decrypt("1008");
            PDFTextStripper pdfs = new PDFTextStripper();
            string temp = pdfs.getText(pdoc);
            pdoc.close();
            Stream mystream = File.Open("d:\\1.doc", FileMode.Create);
            StreamWriter sw = new StreamWriter(mystream, Encoding.GetEncoding("gb2312"));
            sw.Write(temp);
            sw.Close();
            mystream.Close();
        }