com.netsteadfast.greenstep.util.PdfConvertUtils.java Source code

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Here is the source code for com.netsteadfast.greenstep.util.PdfConvertUtils.java

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/* 
 * Copyright 2012-2016 bambooCORE, greenstep of copyright Chen Xin Nien
 * 
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * -----------------------------------------------------------------------
 * 
 * author:    Chen Xin Nien
 * contact: chen.xin.nien@gmail.com
 * 
 */
package com.netsteadfast.greenstep.util;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.util.LinkedList;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.math.NumberUtils;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.util.ImageIOUtil;

import com.netsteadfast.greenstep.base.Constants;
import com.netsteadfast.greenstep.base.exception.ServiceException;

public class PdfConvertUtils {

    public static List<String> toImageUpload(File pdfFile, int resolution, String system, String uploadType,
            boolean isFile) throws ServiceException, Exception {
        List<String> oids = new LinkedList<String>();
        List<File> imageFiles = toImageFiles(pdfFile, resolution);
        for (File file : imageFiles) {
            oids.add(UploadSupportUtils.create(system, uploadType, isFile, file, file.getName()));
        }
        return oids;
    }

    @SuppressWarnings("unchecked")
    public static List<File> toImageFiles(File pdfFile, int resolution) throws Exception {
        PDDocument document = PDDocument.loadNonSeq(pdfFile, null);
        List<PDPage> pages = document.getDocumentCatalog().getAllPages();
        File tmpDir = new File(Constants.getWorkTmpDir() + "/" + PdfConvertUtils.class.getSimpleName() + "/"
                + System.currentTimeMillis() + "/");
        FileUtils.forceMkdir(tmpDir);
        List<File> files = new LinkedList<File>();
        int len = String.valueOf(pages.size() + 1).length();
        for (int i = 0; i < pages.size(); i++) {
            String name = StringUtils.leftPad(String.valueOf(i + 1), len, "0");
            BufferedImage bufImage = pages.get(i).convertToImage(BufferedImage.TYPE_INT_RGB, resolution);
            File imageFile = new File(tmpDir.getPath() + "/" + name + ".png");
            FileOutputStream fos = new FileOutputStream(imageFile);
            ImageIOUtil.writeImage(bufImage, "png", fos, resolution);
            fos.flush();
            fos.close();
            files.add(imageFile);
        }
        document.close();
        tmpDir = null;
        return files;
    }

    public static void main(String args[]) throws Exception {
        if (args == null || args.length != 2) {
            System.out.println("PdfConvertUtils [FILE] [RESOLUTION]");
            System.out.println("Example: PdfConvertUtils /test.pdf 120");
            System.exit(1);
        }
        System.out.println("source document file: " + args[0]);
        int res = NumberUtils.toInt(args[1], 300);
        List<File> imageFiles = toImageFiles(new File(args[0]), res);
        for (File file : imageFiles) {
            System.out.println(file.getPath());
        }
    }

}