icepdf 将pdf转换为图片

原地址：http://www.doc100.net/bugs/t/85462/index.html

PDFBox 与 PDFRender在转换时有清晰度与效率的问题，

PDFBox转换效果稍好，PDFRender更快，但是多线程操作不能大幅提高转换效率。

package com.zas.ice.test;
/** Copyright 2006-2013 ICEsoft Technologies Inc.** 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.*/import org.icepdf.core.exceptions.PDFException;
import org.icepdf.core.exceptions.PDFSecurityException;
import org.icepdf.core.pobjects.Document;
import org.icepdf.core.pobjects.PDimension;
import org.icepdf.core.pobjects.Page;
import org.icepdf.core.util.GraphicsRenderingHints;
import org.icepdf.ri.util.FontPropertiesManager;
import org.icepdf.ri.util.PropertiesManager;import javax.imageio.ImageIO;import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.ResourceBundle;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;/*** The <code>PageCapture</code> class is an example of how to save page* captures to disk.  A file specified at the command line is opened and every* page in the document is captured as an image and saved to disk as a* PNG graphic file.** @since 5.0*/
public class PageCapture {static String outputFilePath = "D:\\pdf\\Linux命令行技术大全222222\\";public static void main(String[] args) {// Get a file from the command line to openString filePath = "D:\\pdf\\面向对象软件构造(第二版)中英对照版.pdf";// read/store the font cache.ResourceBundle messageBundle = ResourceBundle.getBundle(PropertiesManager.DEFAULT_MESSAGE_BUNDLE);PropertiesManager properties = new PropertiesManager(System.getProperties(),ResourceBundle.getBundle(PropertiesManager.DEFAULT_MESSAGE_BUNDLE));new FontPropertiesManager(properties, System.getProperties(), messageBundle);// start the capturePageCapture pageCapture = new PageCapture();pageCapture.capturePages(filePath);}public void capturePages(String filePath) {long beginTime = System.nanoTime();// open the urlDocument document = new Document();// setup two threads to handle image extraction.ExecutorService executorService = Executors.newFixedThreadPool(100);try {document.setFile(filePath);// create a list of callables.int pages = document.getNumberOfPages();java.util.List<Callable<Void>> callables = new ArrayList<Callable<Void>>(pages);for (int i = 0; i <= pages; i++) {callables.add(new CapturePage(document, i));}executorService.invokeAll(callables);executorService.submit(new DocumentCloser(document)).get();} catch (InterruptedException e) {System.out.println("Error parsing PDF document " + e);} catch (ExecutionException e) {System.out.println("Error parsing PDF document " + e);} catch (PDFException ex) {System.out.println("Error parsing PDF document " + ex);} catch (PDFSecurityException ex) {System.out.println("Error encryption not supported " + ex);} catch (FileNotFoundException ex) {System.out.println("Error file not found " + ex);} catch (IOException ex) {System.out.println("Error handling PDF document " + ex);}executorService.shutdown();long endTime = System.nanoTime();System.out.println("耗时: " + (endTime - beginTime) / 1000000000 + " 秒" );}/*** Captures images found in a page  parse to file.*/public class CapturePage implements Callable<Void> {private Document document;private int pageNumber;private float scale = 1f;private float rotation = 0f;private CapturePage(Document document, int pageNumber) {this.document = document;this.pageNumber = pageNumber;}public Void call() {Page page = document.getPageTree().getPage(pageNumber);page.init();PDimension sz = page.getSize(Page.BOUNDARY_CROPBOX, rotation, scale);int pageWidth = (int) sz.getWidth();int pageHeight = (int) sz.getHeight();BufferedImage image = new BufferedImage(pageWidth,pageHeight,BufferedImage.TYPE_INT_RGB);Graphics g = image.createGraphics();page.paint(g, GraphicsRenderingHints.PRINT,Page.BOUNDARY_CROPBOX, rotation, scale);g.dispose();// capture the page image to filetry {System.out.println("Capturing page " + pageNumber);File file = new File(outputFilePath + "imageCapture_" + pageNumber + ".png");ImageIO.write(image, "png", file);} catch (Throwable e) {e.printStackTrace();}image.flush();return null;}}/*** Disposes the document.*/public class DocumentCloser implements Callable<Void> {private Document document;private DocumentCloser(Document document) {this.document = document;}public Void call() {if (document != null) {document.dispose();System.out.println("Document disposed");}return null;}}
}

代码用到了JDK的线程池，也用到了任务callable，算是涨涨见识了

在转换的效果上比PDFRender略好，与PDFBox差不远；在转换的效率上，比PDFBox好很多，比PDFRender略差。

资料包是从一位Iteye用户那里下的，但是记不住他的链接了。

IcePdf官网 http://www.icesoft.org/java/home.jsf

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