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    <p>Use the below code to create an attachments, please go throw the code as I have spent only few minutes, understand it and remove the unnecessary codes. </p> <p>There is a RESOURCE variable which points all the pdf's or files you want to attach. here in this case, it is public static final String RESOURCE = "chapter16/%s.pdf";</p> <p>Where the chapter16 folder has the pdf's you want to attached and %s will be replaced with the name of the file that you provide and the file format is .pdf(if you are attaching a pdf file)</p> <p>It works and tested in my system. I refered this code from <a href="http://itextpdf.com/examples/iia.php?id=289" rel="nofollow">here</a></p> <pre><code>// I create the list which has the list of files names i want to attach ArrayList&lt;String&gt; strList = new ArrayList&lt;String&gt;(); strList.add("Strings"); // its the same file I'm attaching four times strList.add("Strings"); // where "Strings" is the name of the file strList.add("Strings"); strList.add("Strings"); </code></pre> <hr> <pre><code>import java.io.ByteArrayOutputStream; import java.io.FileOutputStream; import java.io.IOException; import java.sql.SQLException; import java.util.ArrayList; import com.itextpdf.text.Chunk; import com.itextpdf.text.Document; import com.itextpdf.text.DocumentException; import com.itextpdf.text.List; import com.itextpdf.text.ListItem; import com.itextpdf.text.Paragraph; import com.itextpdf.text.pdf.PRStream; import com.itextpdf.text.pdf.PdfAnnotation; import com.itextpdf.text.pdf.PdfArray; import com.itextpdf.text.pdf.PdfDictionary; import com.itextpdf.text.pdf.PdfName; import com.itextpdf.text.pdf.PdfReader; import com.itextpdf.text.pdf.PdfWriter; /** * Creates a PDF listing of attachments * The attachments can be extracted. */ public class AttachFiles { /** Path to the resources. */ public static final String RESOURCE = "chapter16/%s.pdf"; /** The filename of the resulting PDF. */ public static final String FILENAME = "ResultingFile.pdf"; /** The path to the resulting PDFs */ public static final String PATH = "chapter16/%s"; /** The filename of the PDF */ public static final String RESULT = String.format(PATH, FILENAME); /** * Creates a PDF listing * @throws IOException * @throws DocumentException * @throws SQLException */ public static void main(String[] args) throws IOException, DocumentException, SQLException { AttachFiles attachFiles = new AttachFiles(); FileOutputStream os = new FileOutputStream(RESULT); os.write(attachFiles.createPdf()); os.flush(); os.close(); attachFiles.extractAttachments(RESULT); } /** * Extracts attachments from an existing PDF. * @param src the path to the existing PDF * @param dest where to put the extracted attachments * @throws IOException */ public void extractAttachments(String src) throws IOException { PdfReader reader = new PdfReader(src); PdfArray array; PdfDictionary annot; PdfDictionary fs; PdfDictionary refs; for (int i = 1; i &lt;= reader.getNumberOfPages(); i++) { array = reader.getPageN(i).getAsArray(PdfName.ANNOTS); if (array == null) continue; for (int j = 0; j &lt; array.size(); j++) { annot = array.getAsDict(j); if (PdfName.FILEATTACHMENT.equals(annot.getAsName(PdfName.SUBTYPE))) { fs = annot.getAsDict(PdfName.FS); refs = fs.getAsDict(PdfName.EF); for (PdfName name : refs.getKeys()) { FileOutputStream fos = new FileOutputStream(String.format(PATH, fs.getAsString(name).toString())); fos.write(PdfReader.getStreamBytes((PRStream)refs.getAsStream(name))); fos.flush(); fos.close(); } } } } } /** * Creates the PDF. * @return the bytes of a PDF file. * @throws DocumentExcetpion * @throws IOException * @throws SQLException */ public byte[] createPdf() throws DocumentException, IOException, SQLException { // step 1 Document document = new Document(); // step 2 ByteArrayOutputStream baos = new ByteArrayOutputStream(); PdfWriter writer = PdfWriter.getInstance(document, baos); // step 3 document.open(); // step 4 document.add(new Paragraph("This is a list pdf attachments.")); PdfAnnotation annot; ListItem item; Chunk chunk; List list = new List(); // I create the list which has the list of files names i want to attach ArrayList&lt;String&gt; strList = new ArrayList&lt;String&gt;(); strList.add("Strings"); // its the same file I'm attaching four times strList.add("Strings"); strList.add("Strings"); strList.add("Strings"); for (String strWord : strList) { annot = PdfAnnotation.createFileAttachment( writer, null, "Name", null, String.format(RESOURCE, strWord), String.format("%s.pdf", strWord)); item = new ListItem("Name"); item.add("\u00a0\u00a0"); chunk = new Chunk("\u00a0\u00a0\u00a0\u00a0"); chunk.setAnnotation(annot); item.add(chunk); list.add(item); } document.add(list); // step 5 document.close(); return baos.toByteArray(); } } </code></pre>
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