String readFile = "xxx.pdf"; FileInputStream pdfStream = null; try { pdfStream = new FileInputStream(readFile); PDFParser pdfParser = new PDFParser(pdfStream); pdf = pdfParser.getPDDocument(); } catch (Exception e) { e.printStackTrace(); } finally { if (pdfStream != null) { pdfStream.close(); } } String writeFile = "xxx.pdf"; COSWriter writer = null; FileOutputStream stream = null; try { stream =