Mengubah kata sandi file PDF

Mengubah kata sandi file PDF

Gunakan PdfFileSecurity ketika Anda perlu memutar kredensial pada PDF yang sudah diamankan.

Langkah

1. Buat sebuah instans PdfFileSecurity.
2. Ikat PDF yang diamankan dengan bindPdf.
3. Panggil yang sesuai changePassword overload, tergantung pada apakah Anda juga ingin mengatur ulang hak istimewa dan ukuran kunci.
4. Simpan file yang telah diperbarui dan tutup objek keamanan.

Contoh Java

public static void changeUserAndOwnerPassword(Path inputFile, Path outputFile) {
    PdfFileSecurity fileSecurity = new PdfFileSecurity();
    fileSecurity.bindPdf(inputFile.toString());
    fileSecurity.changePassword("owner_password", "new_user_password", "new_owner_password");
    fileSecurity.save(outputFile.toString());
    fileSecurity.close();
}

public static void changePasswordAndResetSecurity(Path inputFile, Path outputFile) {
    PdfFileSecurity fileSecurity = new PdfFileSecurity();
    fileSecurity.bindPdf(inputFile.toString());
    DocumentPrivilege privilege = DocumentPrivilege.getForbidAll();
    privilege.setAllowPrint(true);
    fileSecurity.changePassword("owner_password", "new_user_password", "new_owner_password", privilege, KeySize.x128);
    fileSecurity.save(outputFile.toString());
    fileSecurity.close();
}

public static void tryChangePasswordWithoutException(Path inputFile, Path outputFile) {
    PdfFileSecurity fileSecurity = new PdfFileSecurity();
    fileSecurity.bindPdf(inputFile.toString());
    if (fileSecurity.tryChangePassword("owner_password", "new_user_password", "new_owner_password")) {
        fileSecurity.save(outputFile.toString());
    } else {
        System.out.println("Password change failed. Check owner password or document security.");
    }
    fileSecurity.close();
}