splitpdf.java

源码包含生成 PDF 和 HTML 的类库

/*
 * $Id: SplitPdf.java 3373 2008-05-12 16:21:24Z xlv $
 *
 * Copyright 2002 by Bruno Lowagie
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999-2006 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000-2006 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library 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 Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */

package com.lowagie.tools;

import java.io.FileOutputStream;

import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;

/**
 * This class demonstrates how to split a PDF file using iText.
 * @author Bruno Lowagie
 * @since 2.1.1 (renamed to follow Java naming conventions)
 */
public class SplitPdf extends java.lang.Object {
    
    /**
     * This class can be used to split an existing PDF file.
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        if (args.length != 4) {
            System.err.println("arguments: srcfile destfile1 destfile2 pagenumber");
        }
        else {
            try {
				int pagenumber = Integer.parseInt(args[3]);
                
				// we create a reader for a certain document
				PdfReader reader = new PdfReader(args[0]);
				// we retrieve the total number of pages
				int n = reader.getNumberOfPages();
				System.out.println("There are " + n + " pages in the original file.");
                
				if (pagenumber < 2 || pagenumber > n) {
					throw new DocumentException("You can't split this document at page " + pagenumber + "; there is no such page.");
				}
                
				// step 1: creation of a document-object
				Document document1 = new Document(reader.getPageSizeWithRotation(1));
				Document document2 = new Document(reader.getPageSizeWithRotation(pagenumber));
				// step 2: we create a writer that listens to the document
				PdfWriter writer1 = PdfWriter.getInstance(document1, new FileOutputStream(args[1]));
				PdfWriter writer2 = PdfWriter.getInstance(document2, new FileOutputStream(args[2]));
				// step 3: we open the document
				document1.open();
				PdfContentByte cb1 = writer1.getDirectContent();
				document2.open();
				PdfContentByte cb2 = writer2.getDirectContent();
				PdfImportedPage page;
				int rotation;
				int i = 0;
				// step 4: we add content
				while (i < pagenumber - 1) {
					i++;
					document1.setPageSize(reader.getPageSizeWithRotation(i));
					document1.newPage();
					page = writer1.getImportedPage(reader, i);
					rotation = reader.getPageRotation(i);
					if (rotation == 90 || rotation == 270) {
						cb1.addTemplate(page, 0, -1f, 1f, 0, 0, reader.getPageSizeWithRotation(i).getHeight());
					}
					else {
						cb1.addTemplate(page, 1f, 0, 0, 1f, 0, 0);
					}
				}
				while (i < n) {
					i++;
					document2.setPageSize(reader.getPageSizeWithRotation(i));
					document2.newPage();
					page = writer2.getImportedPage(reader, i);
					rotation = reader.getPageRotation(i);
					if (rotation == 90 || rotation == 270) {
						cb2.addTemplate(page, 0, -1f, 1f, 0, 0, reader.getPageSizeWithRotation(i).getHeight());
					}
					else {
						cb2.addTemplate(page, 1f, 0, 0, 1f, 0, 0);
					}
					System.out.println("Processed page " + i);
				}
				// step 5: we close the document
				document1.close();
				document2.close();
            }
            catch(Exception e) {
                e.printStackTrace();
            }
        }
    }
}