Java tutorial
/* * * This file is part of the iText (R) project. Copyright (c) 1998-2019 iText Group NV * Authors: Bruno Lowagie, Paulo Soares, et al. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License version 3 * as published by the Free Software Foundation with the addition of the * following permission added to Section 15 as permitted in Section 7(a): * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT * OF THIRD PARTY RIGHTS * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU Affero General Public License for more details. * You should have received a copy of the GNU Affero General Public License * along with this program; if not, see http://www.gnu.org/licenses or write to * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * Boston, MA, 02110-1301 USA, or download the license from the following URL: * http://itextpdf.com/terms-of-use/ * * The interactive user interfaces in modified source and object code versions * of this program must display Appropriate Legal Notices, as required under * Section 5 of the GNU Affero General Public License. * * In accordance with Section 7(b) of the GNU Affero General Public License, * a covered work must retain the producer line in every PDF that is created * or manipulated using iText. * * You can be released from the requirements of the license by purchasing * a commercial license. Buying such a license is mandatory as soon as you * develop commercial activities involving the iText software without * disclosing the source code of your own applications. * These activities include: offering paid services to customers as an ASP, * serving PDFs on the fly in a web application, shipping iText with a closed * source product. * * For more information, please contact iText Software Corp. at this * address: sales@itextpdf.com */ package com.itextpdf.text.pdf; import java.io.IOException; import java.io.InputStream; import java.net.URL; import java.util.HashMap; import com.itextpdf.text.log.Counter; import com.itextpdf.text.log.CounterFactory; /** Reads an FDF form and makes the fields available * @author Paulo Soares */ public class FdfReader extends PdfReader { HashMap<String, PdfDictionary> fields; String fileSpec; PdfName encoding; /** Reads an FDF form. * @param filename the file name of the form * @throws IOException on error */ public FdfReader(String filename) throws IOException { super(filename); } /** Reads an FDF form. * @param pdfIn the byte array with the form * @throws IOException on error */ public FdfReader(byte pdfIn[]) throws IOException { super(pdfIn); } /** Reads an FDF form. * @param url the URL of the document * @throws IOException on error */ public FdfReader(URL url) throws IOException { super(url); } /** Reads an FDF form. * @param is the <CODE>InputStream</CODE> containing the document. The stream is read to the * end but is not closed * @throws IOException on error */ public FdfReader(InputStream is) throws IOException { super(is); } protected static Counter COUNTER = CounterFactory.getCounter(FdfReader.class); protected Counter getCounter() { return COUNTER; } @Override protected void readPdf() throws IOException { fields = new HashMap<String, PdfDictionary>(); tokens.checkFdfHeader(); rebuildXref(); readDocObj(); readFields(); } protected void kidNode(PdfDictionary merged, String name) { PdfArray kids = merged.getAsArray(PdfName.KIDS); if (kids == null || kids.isEmpty()) { if (name.length() > 0) name = name.substring(1); fields.put(name, merged); } else { merged.remove(PdfName.KIDS); for (int k = 0; k < kids.size(); ++k) { PdfDictionary dic = new PdfDictionary(); dic.merge(merged); PdfDictionary newDic = kids.getAsDict(k); PdfString t = newDic.getAsString(PdfName.T); String newName = name; if (t != null) newName += "." + t.toUnicodeString(); dic.merge(newDic); dic.remove(PdfName.T); kidNode(dic, newName); } } } protected void readFields() { catalog = trailer.getAsDict(PdfName.ROOT); PdfDictionary fdf = catalog.getAsDict(PdfName.FDF); if (fdf == null) return; PdfString fs = fdf.getAsString(PdfName.F); if (fs != null) fileSpec = fs.toUnicodeString(); PdfArray fld = fdf.getAsArray(PdfName.FIELDS); if (fld == null) return; encoding = fdf.getAsName(PdfName.ENCODING); PdfDictionary merged = new PdfDictionary(); merged.put(PdfName.KIDS, fld); kidNode(merged, ""); } /** Gets all the fields. The map is keyed by the fully qualified * field name and the value is a merged <CODE>PdfDictionary</CODE> * with the field content. * @return all the fields */ public HashMap<String, PdfDictionary> getFields() { return fields; } /** Gets the field dictionary. * @param name the fully qualified field name * @return the field dictionary */ public PdfDictionary getField(String name) { return fields.get(name); } /** * Gets a byte[] containing a file that is embedded in the FDF. * @param name the fully qualified field name * @return the bytes of the file * @throws IOException * @since 5.0.1 */ public byte[] getAttachedFile(String name) throws IOException { PdfDictionary field = fields.get(name); if (field != null) { PdfIndirectReference ir = (PRIndirectReference) field.get(PdfName.V); PdfDictionary filespec = (PdfDictionary) getPdfObject(ir.getNumber()); PdfDictionary ef = filespec.getAsDict(PdfName.EF); ir = (PRIndirectReference) ef.get(PdfName.F); PRStream stream = (PRStream) getPdfObject(ir.getNumber()); return getStreamBytes(stream); } return new byte[0]; } /** * Gets the field value or <CODE>null</CODE> if the field does not * exist or has no value defined. * @param name the fully qualified field name * @return the field value or <CODE>null</CODE> */ public String getFieldValue(String name) { PdfDictionary field = fields.get(name); if (field == null) return null; PdfObject v = getPdfObject(field.get(PdfName.V)); if (v == null) return null; if (v.isName()) return PdfName.decodeName(((PdfName) v).toString()); else if (v.isString()) { PdfString vs = (PdfString) v; if (encoding == null || vs.getEncoding() != null) return vs.toUnicodeString(); byte b[] = vs.getBytes(); if (b.length >= 2 && b[0] == (byte) 254 && b[1] == (byte) 255) return vs.toUnicodeString(); try { if (encoding.equals(PdfName.SHIFT_JIS)) return new String(b, "SJIS"); else if (encoding.equals(PdfName.UHC)) return new String(b, "MS949"); else if (encoding.equals(PdfName.GBK)) return new String(b, "GBK"); else if (encoding.equals(PdfName.BIGFIVE)) return new String(b, "Big5"); else if (encoding.equals(PdfName.UTF_8)) return new String(b, "UTF8"); } catch (Exception e) { } return vs.toUnicodeString(); } return null; } /** Gets the PDF file specification contained in the FDF. * @return the PDF file specification contained in the FDF */ public String getFileSpec() { return fileSpec; } }