Java　PDF转换JPG--我家超超会发光

Java PDF转换JPG

[ 2017-3-12 21:33:00 | By: 我家超超会发光 ]

package com.hljw.cmeav.util;

import java.awt.Image;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.List;

import javax.imageio.ImageIO;

import org.icepdf.core.pobjects.Document;
import org.icepdf.core.pobjects.Page;
import org.icepdf.core.util.GraphicsRenderingHints;

import com.google.common.collect.Lists;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.pdfview.PDFFile;
import com.sun.pdfview.PDFPage;

public class PdfToJpgUtils {

   public static void toJpg(String pdfFile) {
       try {
           Document *** = new Document();
           ***.setFile(pdfFile);
           float scale = 2f;
           float rotation = 0f;
           File file = new File(pdfFile);
           String dirJpg = file.getName().toLowerCase().replace(".pdf", "");
           String jpgFilePath = file.getParentFile().getAbsolutePath() + File.separator + dirJpg;
           File jpgdir = new File(jpgFilePath);
           if (!jpgdir.exists()) {
               jpgdir.mkdirs();
           }
           for (int i = 0; i < ***.getNumberOfPages(); i++) {
               BufferedImage image = (BufferedImage) ***.getPageImage(i, GraphicsRenderingHints.SCREEN, Page.BOUNDARY_CROPBOX, rotation, scale);
               RenderedImage rendImage = image;
               File jpgFile = new File(jpgFilePath + File.separator + i + ".jpg");
               if (jpgFile.exists()) {
                   jpgFile.delete();
               }
               ImageIO.write(rendImage, "jpg", jpgFile);
               image.flush();
           }
           ***.dispose();
       } catch (Exception e) {
           e.printStackTrace();
       }
   }

   public static List<String> pdfToJpg(String fileName) throws IOException {
       List<String> list = Lists.newArrayList();
       int index = fileName.lastIndexOf(".");
       String startFile = fileName.substring(0,index);
       File file = new File(fileName);
       RandomAccessFile raf = new RandomAccessFile(file, "r");
       FileChannel channel = raf.getChannel();
       ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
       PDFFile pdffile = new PDFFile(buf);
       for (int i = 1; i <= pdffile.getNumPages(); i++) {
           PDFPage page = pdffile.getPage(i);
           Rectangle rect = new Rectangle(0, 0, (int) page.getBBox().getWidth(), (int) page.getBBox().getHeight());
           Image img = page.getImage(rect.width, rect.height, // width &
                   // height
                   rect, // clip rect
                   null, // null for the ImageObserver
                   true, // fill background with white
                   true // block until drawing is done
                   );

           BufferedImage tag = new BufferedImage(rect.width, rect.height, BufferedImage.TYPE_INT_RGB);
           tag.getGraphics().drawImage(img, 0, 0, rect.width, rect.height, null);
           FileOutputStream out = new FileOutputStream(startFile + ".jpg"); // 输出到文件流
           JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
           encoder.encode(tag); // JPEG编码
           out.close();
           list.add(startFile + ".jpg");
       }
       return list;
   }

   public static void main(String[] args) throws IOException {
       pdfToJpg("D:/64bitTomcat/apache-tomcat-7.0.55/webapps/renqiuyiyuan/upload/item_result_images/img/4028803b55585c0f0155587ea7920008.pdf");
   }
}

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