Here is my code:
File f = new File("C://secure_abc.pdf"); FileOutputStream out = new FileOutputStream(f); PdfReader reader = new PdfReader("C://abc.pdf"); System.out.println("reader.getFileLength(): "+reader.getFileLength()); PdfStamper stamp = new PdfStamper(reader, out); stamp.setEncryption(null, null, PdfWriter.ALLOW_PRINTING, PdfWriter.ENCRYPTION_AES_128);
In iText 7 all manipulations with PDF are done using
PdfDocument instance. Encryption can be done like this:
PdfReader reader = new PdfReader(src); WriterProperties props = new WriterProperties() .setStandardEncryption("Hello".getBytes(), "World".getBytes(), EncryptionConstants.ALLOW_PRINTING, EncryptionConstants.ENCRYPTION_AES_128 | EncryptionConstants.DO_NOT_ENCRYPT_METADATA); PdfWriter writer = new PdfWriter(new FileOutputStream(dest), props); PdfDocument pdfDoc = new PdfDocument(reader, writer); pdfDoc.close();
The problem you faced with, was about not closed
PdfStamper. Don’t forget to close the
PdfDocument instance from now on.
Click this link if you want to see how to answer this question in iText 5.