"Splits" a document by creating a new set of PDF files by extracting pages from the source file based on a maximum number of pages in the new files. The original file is unmodified.

SplitDocumentBasedOnNumberOfPages.java

/*
 * Copyright Datalogics, Inc. 2015
 */

package pdfjt.cookbook.document;

import com.adobe.internal.io.ByteReader;
import com.adobe.internal.io.ByteWriter;
import com.adobe.internal.io.InputStreamByteReader;
import com.adobe.pdfjt.pdf.document.PDFDocument;
import com.adobe.pdfjt.pdf.document.PDFOpenOptions;
import com.adobe.pdfjt.pdf.document.PDFSaveFullOptions;
import com.adobe.pdfjt.pdf.page.PDFPage;
import com.adobe.pdfjt.services.manipulations.PMMOptions;
import com.adobe.pdfjt.services.manipulations.PMMService;

import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

import pdfjt.util.SampleFileServices;

/**
 * "Splits" a document by creating a new set of PDF files by extracting pages
 * from the source file based on a maximum number of pages in the new files.
 * The original file is unmodified.
 * 
 * What you need to know first:
 * Not much really. The PMMService class was designed to make extracting pages
 * super-simple.
 * 
 */
public class SplitDocumentBasedOnNumberOfPages {

    private static final String inputPDFURL = "http://dev.datalogics.com/cookbook/document/AcrobatDC_PDFCreationSettings.pdf";
    private static final String outputDir = "cookbook/Document/output/split/";
    private static final String baseFileName = "Extracted_Pages_";
    private static final int maxPageCount = 25;

    public static void main(String[] args) throws Exception {
        /*
         * Read in PDF input file
         */
        URLConnection connection = new URL(inputPDFURL).openConnection();
        connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.95 Safari/537.11");
        connection.connect();
        InputStream fis = connection.getInputStream();        
        ByteReader byteReader = new InputStreamByteReader(fis);
        PDFDocument pdfDocument = PDFDocument.newInstance(byteReader, PDFOpenOptions.newInstance());
        // Set up the Page Manager Service
        PMMService pmmService = new PMMService(pdfDocument);
        PMMOptions pmmOptions = PMMOptions.newInstanceAll();
        PDFOpenOptions pdfOpenOptions = PDFOpenOptions.newInstance();
        // Get the total number of pages
        int numPages = pdfDocument.requirePages().getNumPages();
        int numSubFiles = (int) Math.ceil(numPages/(double) maxPageCount);
        for (int i = 0; i < numSubFiles; i++) {
            PDFPage startPage = pdfDocument.requirePages().getPage(i*maxPageCount);
            PDFDocument outputDocument = pmmService.extractPages(startPage, maxPageCount, pmmOptions, pdfOpenOptions);
            // Construct the new filename
            String outputFileName = constructOutputFileName(i, numSubFiles, numPages);
            // Save it.
            ByteWriter outputFile = SampleFileServices.getRAFByteWriter(outputDir + outputFileName);
            outputDocument.save(outputFile, PDFSaveFullOptions.newInstance());
            System.out.println("Created: " + outputFileName);
        }
        System.out.println("Done!");
    }
    
    /**
     * Constructs a filename for the output PDF file.
     * 
     * @param i
     *            The loop iteration.
     * @param numSubFiles
     *            The number of iterations iteration.
     * @param numPages
     *            The total number of pages in the file.              
     * @return String
     */

    private static String constructOutputFileName(int i, int numSubFiles, int numPages) {
        String outputFileName = baseFileName + String.format("%03d", (i*maxPageCount) + 1)+"-";
        if (i == numSubFiles-1) {
            outputFileName = outputFileName+String.format("%03d", numPages);
        }
        else {
            outputFileName = outputFileName+String.format("%03d", (i*maxPageCount)+maxPageCount + 1);
        }
        outputFileName = outputFileName+".pdf";
        return outputFileName;
    }
}