pdfmergerutility.java

非常有用的操作pdf文件的java源码

/**
 * Copyright (c) 2003-2006, www.pdfbox.org
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of pdfbox; nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * http://www.pdfbox.org
 *
 */
package org.pdfbox.util;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.pdfbox.cos.COSArray;
import org.pdfbox.cos.COSBase;
import org.pdfbox.cos.COSDictionary;
import org.pdfbox.cos.COSInteger;
import org.pdfbox.cos.COSName;
import org.pdfbox.cos.COSNumber;
import org.pdfbox.cos.COSObject;
import org.pdfbox.cos.COSStream;
import org.pdfbox.exceptions.COSVisitorException;
import org.pdfbox.pdmodel.PDDocument;
import org.pdfbox.pdmodel.PDDocumentCatalog;
import org.pdfbox.pdmodel.PDDocumentInformation;
import org.pdfbox.pdmodel.PDDocumentNameDictionary;
import org.pdfbox.pdmodel.PDPage;
import org.pdfbox.pdmodel.common.COSArrayList;
import org.pdfbox.pdmodel.common.COSObjectable;
import org.pdfbox.pdmodel.common.PDStream;
import org.pdfbox.pdmodel.interactive.documentnavigation.outline.PDDocumentOutline;
import org.pdfbox.pdmodel.interactive.documentnavigation.outline.PDOutlineItem;
import org.pdfbox.pdmodel.interactive.form.PDAcroForm;
import org.pdfbox.pdmodel.interactive.form.PDField;
import org.pdfbox.pdmodel.interactive.form.PDFieldFactory;

/**
 * This class will take a list of pdf documents and merge them, saving the result 
 * in a new document. 
 *
 * @author <a href="mailto:[e-mail]">Ben Litchfield</a>
 * @version $Revision: 1.2 $
 */
public class PDFMergerUtility 
{

    private List sources;
    private String destinationFileName;

    /**
     * Instantiate a new PDFMergerUtility.
     */
    public PDFMergerUtility() 
    {
        sources = new ArrayList();
    }

    /**
     * Get the name of the destination file.
     * @return Returns the destination.
     */
    public String getDestinationFileName() 
    {
        return destinationFileName;
    }

    /**
     * Set the name of the destination file.
     * @param destination
     *            The destination to set.
     */
    public void setDestinationFileName(String destination) 
    {
        this.destinationFileName = destination;
    }

    /**
     * Add a source file to the list of files to merge.
     * 
     * @param source Full path and file name of source document.
     */
    public void addSource(String source) 
    {
        sources.add(new File(source));
    }

    /**
     * Add a source file to the list of files to mere.
     * 
     * @param source File representing source document
     */
    public void addSource(File source) 
    {
        sources.add(source);
    }

    /**
     * Merge the list of source documents, saving the result in the destination file.
     *
     * @throws IOException If there is an error saving the document.
     * @throws COSVisitorException If an error occurs while saving the destination file.
     */
    public void mergeDocuments() throws IOException, COSVisitorException
    {
        PDDocument destination = null;
        File sourceFile;
        PDDocument source;
        if (sources != null && sources.size() > 0) 
        {
            try 
            {
                Iterator sit = sources.iterator();
                sourceFile = (File) sit.next();
                destination = PDDocument.load(sourceFile);
                while (sit.hasNext()) 
                {
                    sourceFile = (File) sit.next();
                    source = PDDocument.load(sourceFile);
                    try 
                    {
                        appendDocument(destination, source);
                    } 
                    finally 
                    {
                        if (source != null)
                        {
                            source.close();
                        }
                    }
                }
                destination.save(destinationFileName);
            } 
            finally 
            {
                if (destination != null)
                {
                    destination.close();
                }
            }
        }
    }


    /**
     * append all pages from source to destination.
     *
     * @param destination the document to receive the pages
     * @param source the document originating the new pages
     *
     * @throws IOException If there is an error accessing data from either document.
     */
    public void appendDocument(PDDocument destination, PDDocument source) throws IOException
    {
        if( destination.isEncrypted() )
        {
            throw new IOException( "Error: destination PDF is encrypted, can't append encrypted PDF documents." );
        }
        if( source.isEncrypted() )
        {
            throw new IOException( "Error: source PDF is encrypted, can't append encrypted PDF documents." );
        }
        PDDocumentInformation destInfo = destination.getDocumentInformation();
        PDDocumentInformation srcInfo = source.getDocumentInformation();
        destInfo.getDictionary().mergeInto( srcInfo.getDictionary() );
        
        PDDocumentCatalog destCatalog = destination.getDocumentCatalog();
        PDDocumentCatalog srcCatalog = source.getDocumentCatalog();

        if( destCatalog.getOpenAction() == null )
        {
            destCatalog.setOpenAction( srcCatalog.getOpenAction() );
        }

        PDAcroForm destAcroForm = destCatalog.getAcroForm();
        PDAcroForm srcAcroForm = srcCatalog.getAcroForm();
        if( destAcroForm == null )
        {
            cloneForNewDocument( destination, srcAcroForm );
            destCatalog.setAcroForm( srcAcroForm );
        }
        else
        {
            mergeAcroForm(destination, destAcroForm, srcAcroForm);
        }

        COSArray destThreads = (COSArray)destCatalog.getCOSDictionary().getDictionaryObject( 
                COSName.getPDFName( "Threads" ));
        COSArray srcThreads = (COSArray)cloneForNewDocument( 
                destination, 
                destCatalog.getCOSDictionary().getDictionaryObject( COSName.getPDFName( "Threads" )));
        if( destThreads == null )
        {
            destCatalog.getCOSDictionary().setItem( COSName.getPDFName( "Threads" ), srcThreads );