blocks|key|854395|text|我认为http://pdfbox.apache.org/会满足您的需求，因为您可以从页面创建图像，然后缩放图像|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|854396|从他们的示例代码中-|854397|/*
+*+Licensed+to+the+Apache+Software+Foundation+(ASF)+under+one+or+more
+*+contributor+license+agreements.++See+the+NOTICE+file+distributed+with
+*+this+work+for+additional+information+regarding+copyright+ownership.
+*+The+ASF+licenses+this+file+to+You+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.
+*/
package+org.apache.pdfbox;

import+java.awt.HeadlessException;
import+java.awt.Toolkit;
import+java.awt.image.BufferedImage;

import+javax.imageio.ImageIO;

import+java.util.List;

import+org.apache.pdfbox.exceptions.InvalidPasswordException;
import+org.apache.pdfbox.pdmodel.PDDocument;
import+org.apache.pdfbox.pdmodel.PDPage;
import+org.apache.pdfbox.pdmodel.common.PDRectangle;
import+org.apache.pdfbox.util.PDFImageWriter;

/**
+*+Convert+a+PDF+document+to+an+image.
+*
+*+@author+<a+href="ben@benlitchfield.com">Ben+Litchfield</a>
+*+@version+$Revision:+1.6+$
+*/
public+class+PDFToImage
{

++++private+static+final+String+PASSWORD+=+"-password";
++++private+static+final+String+START_PAGE+=+"-startPage";
++++private+static+final+String+END_PAGE+=+"-endPage";
++++private+static+final+String+IMAGE_FORMAT+=+"-imageType";
++++private+static+final+String+OUTPUT_PREFIX+=+"-outputPrefix";
++++private+static+final+String+COLOR+=+"-color";
++++private+static+final+String+RESOLUTION+=+"-resolution";
++++private+static+final+String+CROPBOX+=+"-cropbox";

++++/**
+++++*+private+constructor.
++++*/
++++private+PDFToImage()
++++{
++++++++//static+class
++++}

++++/**
+++++*+Infamous+main+method.
+++++*
+++++*+@param+args+Command+line+arguments,+should+be+one+and+a+reference+to+a+file.
+++++*
+++++*+@throws+Exception+If+there+is+an+error+parsing+the+document.
+++++*/
++++public+static+void+main(+String[]+args+)+throws+Exception
++++{
++++++++String+password+=+"";
++++++++String+pdfFile+=+null;
++++++++String+outputPrefix+=+null;
++++++++String+imageFormat+=+"jpg";
++++++++int+startPage+=+1;
++++++++int+endPage+=+Integer.MAX_VALUE;
++++++++String+color+=+"rgb";
++++++++int+resolution;
++++float+cropBoxLowerLeftX+=+0;
++++float+cropBoxLowerLeftY+=+0;
++++float+cropBoxUpperRightX+=+0;
++++float+cropBoxUpperRightY+=+0;
++++++++try
++++++++{
++++++++++++resolution+=+Toolkit.getDefaultToolkit().getScreenResolution();
++++++++}
++++++++catch(+HeadlessException+e+)
++++++++{
++++++++++++resolution+=+96;
++++++++}
++++++++for(+int+i+=+0;+i+<+args.length;+i%2B%2B+)
++++++++{
++++++++++++if(+args[i].equals(+PASSWORD+)+)
++++++++++++{
++++++++++++++++i%2B%2B;
++++++++++++++++if(+i+>=+args.length+)
++++++++++++++++{
++++++++++++++++++++usage();
++++++++++++++++}
++++++++++++++++password+=+args[i];
++++++++++++}
++++++++++++else+if(+args[i].equals(+START_PAGE+)+)
++++++++++++{
++++++++++++++++i%2B%2B;
++++++++++++++++if(+i+>=+args.length+)
++++++++++++++++{
++++++++++++++++++++usage();
++++++++++++++++}
++++++++++++++++startPage+=+Integer.parseInt(+args[i]+);
++++++++++++}
++++++++++++else+if(+args[i].equals(+END_PAGE+)+)
++++++++++++{
++++++++++++++++i%2B%2B;
++++++++++++++++if(+i+>=+args.length+)
++++++++++++++++{
++++++++++++++++++++usage();
++++++++++++++++}
++++++++++++++++endPage+=+Integer.parseInt(+args[i]+);
++++++++++++}
++++++++++++else+if(+args[i].equals(+IMAGE_FORMAT+)+)
++++++++++++{
++++++++++++++++i%2B%2B;
++++++++++++++++imageFormat+=+args[i];
++++++++++++}
++++++++++++else+if(+args[i].equals(+OUTPUT_PREFIX+)+)
++++++++++++{
++++++++++++++++i%2B%2B;
++++++++++++++++outputPrefix+=+args[i];
++++++++++++}
++++++++++++else+if(+args[i].equals(+COLOR+)+)
++++++++++++{
++++++++++++++++i%2B%2B;
++++++++++++++++color+=+args[i];
++++++++++++}
++++++++++++else+if(+args[i].equals(+RESOLUTION+)+)
++++++++++++{
++++++++++++++++i%2B%2B;
++++++++++++++++resolution+=+Integer.parseInt(args[i]);
++++++++++++}
++++++++++++else+if(+args[i].equals(+CROPBOX+)+)
++++++++++++{
++++++++++++++++i%2B%2B;
++++++++++++cropBoxLowerLeftX+=+Float.valueOf(args[i]).floatValue();
++++++++++++++++i%2B%2B;
++++++++++++cropBoxLowerLeftY+=+Float.valueOf(args[i]).floatValue();
++++++++++++++++i%2B%2B;
++++++++++++cropBoxUpperRightX+=+Float.valueOf(args[i]).floatValue();
++++++++++++++++i%2B%2B;
++++++++++++cropBoxUpperRightY+=+Float.valueOf(args[i]).floatValue();
++++++++++++}
++++++++++++else
++++++++++++{
++++++++++++++++if(+pdfFile+==+null+)
++++++++++++++++{
++++++++++++++++++++pdfFile+=+args[i];
++++++++++++++++}
++++++++++++}
++++++++}
++++++++if(+pdfFile+==+null+)
++++++++{
++++++++++++usage();
++++++++}
++++++++else
++++++++{
++++++++++++if(outputPrefix+==+null)
++++++++++++{
++++++++++++++++outputPrefix+=+pdfFile.substring(+0,+pdfFile.lastIndexOf(+'.'+));
++++++++++++}

++++++++++++PDDocument+document+=+null;
++++++++++++try
++++++++++++{
++++++++++++++++document+=+PDDocument.load(+pdfFile+);


++++++++++++++++//document.print();
++++++++++++++++if(+document.isEncrypted()+)
++++++++++++++++{
++++++++++++++++++++try
++++++++++++++++++++{
++++++++++++++++++++++++document.decrypt(+password+);
++++++++++++++++++++}
++++++++++++++++++++catch(+InvalidPasswordException+e+)
++++++++++++++++++++{
++++++++++++++++++++++++if(+args.length+==+4+)//they+supplied+the+wrong+password
++++++++++++++++++++++++{
++++++++++++++++++++++++++++System.err.println(+"Error:+The+supplied+password+is+incorrect."+);
++++++++++++++++++++++++++++System.exit(+2+);
++++++++++++++++++++++++}
++++++++++++++++++++++++else
++++++++++++++++++++++++{
++++++++++++++++++++++++++++//they+didn't+supply+a+password+and+the+default+of+""+was+wrong.
++++++++++++++++++++++++++++System.err.println(+"Error:+The+document+is+encrypted."+);
++++++++++++++++++++++++++++usage();
++++++++++++++++++++++++}
++++++++++++++++++++}
++++++++++++++++}
++++++++++++++++int+imageType+=+24;
++++++++++++++++if+("bilevel".equalsIgnoreCase(color))
++++++++++++++++{
++++++++++++++++++++imageType+=+BufferedImage.TYPE_BYTE_BINARY;
++++++++++++++++}
++++++++++++++++else+if+("indexed".equalsIgnoreCase(color))
++++++++++++++++{
++++++++++++++++++++imageType+=+BufferedImage.TYPE_BYTE_INDEXED;
++++++++++++++++}
++++++++++++++++else+if+("gray".equalsIgnoreCase(color))
++++++++++++++++{
++++++++++++++++++++imageType+=+BufferedImage.TYPE_BYTE_GRAY;
++++++++++++++++}
++++++++++++++++else+if+("rgb".equalsIgnoreCase(color))
++++++++++++++++{
++++++++++++++++++++imageType+=+BufferedImage.TYPE_INT_RGB;
++++++++++++++++}
++++++++++++++++else+if+("rgba".equalsIgnoreCase(color))
++++++++++++++++{
++++++++++++++++++++imageType+=+BufferedImage.TYPE_INT_ARGB;
++++++++++++++++}
++++++++++++++++else
++++++++++++++++{
++++++++++++++++++++System.err.println(+"Error:+the+number+of+bits+per+pixel+must+be+1,+8+or+24."+);
++++++++++++++++++++System.exit(+2+);
++++++++++++++++}

++++++++++++++++//si+une+cropBox+a+ete+specifier,+appeler+la+methode+de+modification+de+cropbox
++++++++//changeCropBoxes(PDDocument+document,float+a,+float+b,+float+c,float+d)
++++++++if+(+cropBoxLowerLeftX!=0+%7C%7C+cropBoxLowerLeftY!=0+%7C%7C+cropBoxUpperRightX!=0+%7C%7C+cropBoxUpperRightY!=0+)
++++++++{
++++++++++changeCropBoxes(document,cropBoxLowerLeftX,+cropBoxLowerLeftY,+cropBoxUpperRightX,+cropBoxUpperRightY);
++++++++}

++++++++++++++++//Make+the+call
++++++++++++++++PDFImageWriter+imageWriter+=+new+PDFImageWriter();
++++++++++++++++boolean+success+=+imageWriter.writeImage(document,+imageFormat,+password,
++++++++++++++++++++++++startPage,+endPage,+outputPrefix,+imageType,+resolution);
++++++++++++++++if+(!success)
++++++++++++++++{
++++++++++++++++++++System.err.println(+"Error:+no+writer+found+for+image+format+'"
++++++++++++++++++++++++++++%2B+imageFormat+%2B+"'"+);
++++++++++++++++++++System.exit(1);
++++++++++++++++}
++++++++++++}
++++++++++++catch+(Exception+e)
++++++++++++{
++++++++++++++++System.err.println(e);
++++++++++++}
++++++++++++finally
++++++++++++{
++++++++++++++++if(+document+!=+null+)
++++++++++++++++{
++++++++++++++++++++document.close();
++++++++++++++++}
++++++++++++}
++++++++}
++++}

++++/**
+++++*+This+will+print+the+usage+requirements+and+exit.
+++++*/
++++private+static+void+usage()
++++{
++++++++System.err.println(+"Usage:+java+org.apache.pdfbox.PDFToImage+[OPTIONS]+<PDF+file>\n"+%2B
++++++++++++"++-password++<password>++++++++++Password+to+decrypt+document\n"+%2B
++++++++++++"++-imageType+<image+type>++++++++("+%2B+getImageFormats()+%2B+")\n"+%2B
++++++++++++"++-outputPrefix+<output+prefix>++Filename+prefix+for+image+files\n"+%2B
++++++++++++"++-startPage+<number>++++++++++++The+first+page+to+start+extraction(1+based)\n"+%2B
++++++++++++"++-endPage+<number>++++++++++++++The+last+page+to+extract(inclusive)\n"+%2B
++++++++++++"++-color+<string>++++++++++++++++The+color+depth+(valid:+bilevel,+indexed,+gray,+rgb,+rgba)\n"+%2B
++++++++++++"++-resolution+<number>+++++++++++The+bitmap+resolution+in+dpi\n"+%2B
++++++++++++"++-cropbox+<number>+<number>+<number>+<number>+The+page+area+to+export\n"+%2B
++++++++++++"++<PDF+file>+++++++++++++++++++++The+PDF+document+to+use\n"
++++++++++++);
++++++++System.exit(+1+);
++++}

++++private+static+String+getImageFormats()
++++{
++++++++StringBuffer+retval+=+new+StringBuffer();
++++++++String[]+formats+=+ImageIO.getReaderFormatNames();
++++++++for(+int+i+=+0;+i+<+formats.length;+i%2B%2B+)
++++++++{
++++++++++++retval.append(+formats[i]+);
++++++++++++if(+i+%2B+1+<+formats.length+)
++++++++++++{
++++++++++++++++retval.append(+","+);
++++++++++++}
++++++++}
++++++++return+retval.toString();
++++}

++++private+static+void+changeCropBoxes(PDDocument+document,float+a,+float+b,+float+c,float+d)
++++{
++++++List+pages+=+document.getDocumentCatalog().getAllPages();
++++++for(+int+i+=+0;+i+<+pages.size();+i%2B%2B+)
++++++{
++++++++++++++System.out.println("resizing+page");
++++++++++PDPage+page+=+(PDPage)pages.get(+i+);
++++++++++PDRectangle+rectangle+=+new+PDRectangle();
++++++++++++++rectangle.setLowerLeftX(a);
++++++++++++++rectangle.setLowerLeftY(b);
++++++++++++++rectangle.setUpperRightX(c);
++++++++++++++rectangle.setUpperRightY(d);
++++++++++page.setMediaBox(rectangle);
++++++++++page.setCropBox(rectangle);

++++++}

++++}

}|code-block|syntax|javascript|854398|entityMap|0|LINK|mutability|MUTABLE|url|http://pdfbox.apache.org/^0|3|P|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

I think <a href="http://pdfbox.apache.org/" rel="noreferrer">http://pdfbox.apache.org/</a> will do what you're looking for since you can create an image from a page and then scale the image

From their example code - 

<pre><code>/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.apache.pdfbox;

import java.awt.HeadlessException;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;

import java.util.List;

import org.apache.pdfbox.exceptions.InvalidPasswordException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.util.PDFImageWriter;

/**
 * Convert a PDF document to an image.
 *
 * @author &lt;a href="ben@benlitchfield.com"&gt;Ben Litchfield&lt;/a&gt;
 * @version $Revision: 1.6 $
 */
public class PDFToImage
{

 private static final String PASSWORD = "-password";
 private static final String START_PAGE = "-startPage";
 private static final String END_PAGE = "-endPage";
 private static final String IMAGE_FORMAT = "-imageType";
 private static final String OUTPUT_PREFIX = "-outputPrefix";
 private static final String COLOR = "-color";
 private static final String RESOLUTION = "-resolution";
 private static final String CROPBOX = "-cropbox";

 /**
 * private constructor.
 */
 private PDFToImage()
 {
 //static class
 }

 /**
 * Infamous main method.
 *
 * @param args Command line arguments, should be one and a reference to a file.
 *
 * @throws Exception If there is an error parsing the document.
 */
 public static void main( String[] args ) throws Exception
 {
 String password = "";
 String pdfFile = null;
 String outputPrefix = null;
 String imageFormat = "jpg";
 int startPage = 1;
 int endPage = Integer.MAX_VALUE;
 String color = "rgb";
 int resolution;
 float cropBoxLowerLeftX = 0;
 float cropBoxLowerLeftY = 0;
 float cropBoxUpperRightX = 0;
 float cropBoxUpperRightY = 0;
 try
 {
 resolution = Toolkit.getDefaultToolkit().getScreenResolution();
 }
 catch( HeadlessException e )
 {
 resolution = 96;
 }
 for( int i = 0; i &lt; args.length; i++ )
 {
 if( args[i].equals( PASSWORD ) )
 {
 i++;
 if( i &gt;= args.length )
 {
 usage();
 }
 password = args[i];
 }
 else if( args[i].equals( START_PAGE ) )
 {
 i++;
 if( i &gt;= args.length )
 {
 usage();
 }
 startPage = Integer.parseInt( args[i] );
 }
 else if( args[i].equals( END_PAGE ) )
 {
 i++;
 if( i &gt;= args.length )
 {
 usage();
 }
 endPage = Integer.parseInt( args[i] );
 }
 else if( args[i].equals( IMAGE_FORMAT ) )
 {
 i++;
 imageFormat = args[i];
 }
 else if( args[i].equals( OUTPUT_PREFIX ) )
 {
 i++;
 outputPrefix = args[i];
 }
 else if( args[i].equals( COLOR ) )
 {
 i++;
 color = args[i];
 }
 else if( args[i].equals( RESOLUTION ) )
 {
 i++;
 resolution = Integer.parseInt(args[i]);
 }
 else if( args[i].equals( CROPBOX ) )
 {
 i++;
 cropBoxLowerLeftX = Float.valueOf(args[i]).floatValue();
 i++;
 cropBoxLowerLeftY = Float.valueOf(args[i]).floatValue();
 i++;
 cropBoxUpperRightX = Float.valueOf(args[i]).floatValue();
 i++;
 cropBoxUpperRightY = Float.valueOf(args[i]).floatValue();
 }
 else
 {
 if( pdfFile == null )
 {
 pdfFile = args[i];
 }
 }
 }
 if( pdfFile == null )
 {
 usage();
 }
 else
 {
 if(outputPrefix == null)
 {
 outputPrefix = pdfFile.substring( 0, pdfFile.lastIndexOf( '.' ));
 }

 PDDocument document = null;
 try
 {
 document = PDDocument.load( pdfFile );


 //document.print();
 if( document.isEncrypted() )
 {
 try
 {
 document.decrypt( password );
 }
 catch( InvalidPasswordException e )
 {
 if( args.length == 4 )//they supplied the wrong password
 {
 System.err.println( "Error: The supplied password is incorrect." );
 System.exit( 2 );
 }
 else
 {
 //they didn't supply a password and the default of "" was wrong.
 System.err.println( "Error: The document is encrypted." );
 usage();
 }
 }
 }
 int imageType = 24;
 if ("bilevel".equalsIgnoreCase(color))
 {
 imageType = BufferedImage.TYPE_BYTE_BINARY;
 }
 else if ("indexed".equalsIgnoreCase(color))
 {
 imageType = BufferedImage.TYPE_BYTE_INDEXED;
 }
 else if ("gray".equalsIgnoreCase(color))
 {
 imageType = BufferedImage.TYPE_BYTE_GRAY;
 }
 else if ("rgb".equalsIgnoreCase(color))
 {
 imageType = BufferedImage.TYPE_INT_RGB;
 }
 else if ("rgba".equalsIgnoreCase(color))
 {
 imageType = BufferedImage.TYPE_INT_ARGB;
 }
 else
 {
 System.err.println( "Error: the number of bits per pixel must be 1, 8 or 24." );
 System.exit( 2 );
 }

 //si une cropBox a ete specifier, appeler la methode de modification de cropbox
 //changeCropBoxes(PDDocument document,float a, float b, float c,float d)
 if ( cropBoxLowerLeftX!=0 || cropBoxLowerLeftY!=0 || cropBoxUpperRightX!=0 || cropBoxUpperRightY!=0 )
 {
 changeCropBoxes(document,cropBoxLowerLeftX, cropBoxLowerLeftY, cropBoxUpperRightX, cropBoxUpperRightY);
 }

 //Make the call
 PDFImageWriter imageWriter = new PDFImageWriter();
 boolean success = imageWriter.writeImage(document, imageFormat, password,
 startPage, endPage, outputPrefix, imageType, resolution);
 if (!success)
 {
 System.err.println( "Error: no writer found for image format '"
 + imageFormat + "'" );
 System.exit(1);
 }
 }
 catch (Exception e)
 {
 System.err.println(e);
 }
 finally
 {
 if( document != null )
 {
 document.close();
 }
 }
 }
 }

 /**
 * This will print the usage requirements and exit.
 */
 private static void usage()
 {
 System.err.println( "Usage: java org.apache.pdfbox.PDFToImage [OPTIONS] &lt;PDF file&gt;\n" +
 " -password &lt;password&gt; Password to decrypt document\n" +
 " -imageType &lt;image type&gt; (" + getImageFormats() + ")\n" +
 " -outputPrefix &lt;output prefix&gt; Filename prefix for image files\n" +
 " -startPage &lt;number&gt; The first page to start extraction(1 based)\n" +
 " -endPage &lt;number&gt; The last page to extract(inclusive)\n" +
 " -color &lt;string&gt; The color depth (valid: bilevel, indexed, gray, rgb, rgba)\n" +
 " -resolution &lt;number&gt; The bitmap resolution in dpi\n" +
 " -cropbox &lt;number&gt; &lt;number&gt; &lt;number&gt; &lt;number&gt; The page area to export\n" +
 " &lt;PDF file&gt; The PDF document to use\n"
 );
 System.exit( 1 );
 }

 private static String getImageFormats()
 {
 StringBuffer retval = new StringBuffer();
 String[] formats = ImageIO.getReaderFormatNames();
 for( int i = 0; i &lt; formats.length; i++ )
 {
 retval.append( formats[i] );
 if( i + 1 &lt; formats.length )
 {
 retval.append( "," );
 }
 }
 return retval.toString();
 }

 private static void changeCropBoxes(PDDocument document,float a, float b, float c,float d)
 {
 List pages = document.getDocumentCatalog().getAllPages();
 for( int i = 0; i &lt; pages.size(); i++ )
 {
 System.out.println("resizing page");
 PDPage page = (PDPage)pages.get( i );
 PDRectangle rectangle = new PDRectangle();
 rectangle.setLowerLeftX(a);
 rectangle.setLowerLeftY(b);
 rectangle.setUpperRightX(c);
 rectangle.setUpperRightY(d);
 page.setMediaBox(rectangle);
 page.setCropBox(rectangle);

 }

 }

}
</code></pre>

blocks|key|854431|text|你也可以看看JPedal+(详情请访问http://www.jpedal.org/pdf_thumbnail.php)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|854432|entityMap|0|LINK|mutability|MUTABLE|url|http://www.jpedal.org/pdf_thumbnail.php^0|J|13|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You could also have a look at JPedal (details at <a href="http://www.jpedal.org/pdf_thumbnail.php" rel="noreferrer">http://www.jpedal.org/pdf_thumbnail.php</a>)

blocks|key|1068943|text|IcePdf是我见过的阅读pdf的最好的(免费的)。JPedal很棒，但不是免费的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1068944|如果你打算从pdf生成普通公众可以发送给你的图像，我向你保证(根据经验)你会得到会使JVM崩溃的pdf。(例如:如果它们是全矢量图形的多层pdf)。This+pdf就是一个会导致许多库崩溃的例子(但它是一个完全有效的文档，没有任何有趣的东西，比如Javascript等等)。|offset|length|1068945|我们尝试使用大量的库，最终将创建缩略图的工作委托给ImageMagick，这是一个用于图像处理的高度优化的C程序。|1068946|entityMap|0|LINK|mutability|MUTABLE|url|http://www.milan-ramaiya.com/files/research/neuroscience2009.pdf^0|0|22|8|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

IcePdf is the best that I've seen (that's free) for reading pdfs. JPedal is awesome, but not free.

If you're going to be generating images from pdfs that the general public can send you, I assure you (from experience) that you'll get pdfs that will crash the JVM. (ie: If they're many-layered pdfs with all vector graphics). <a href="http://www.milan-ramaiya.com/files/research/neuroscience2009.pdf" rel="nofollow">This pdf</a> is an example that will crash many libraries (but is a perfectly valid PDF without anything funny like Javascript, etc).

We've gone down the route of trying to use a multitude of libraries and eventually resorting to delegating the work of creating a thumbnail to ImageMagick, which is a highly optimized C program for image manipulation.

blocks|key|854548|text|This+post不仅是pdf，而且还有许多其他文件类型，如办公室，图像，文本……|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|854549|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/16556059/java-create-generate-get-microsoft-office-thumbnail^0|0|9|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<a href="https://stackoverflow.com/questions/16556059/java-create-generate-get-microsoft-office-thumbnail">This post</a> is not only pdf, but also many other file type like office, image, text....

How can I generate a thumbnail image of pages in a PDF document, using Java?

Thumbnail of a PDF page (Java)

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

教程

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云智能顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

EdgeOne AI 安全实战专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

聚焦“写作效率、视觉美观与运行性能”三方面进行全面升级，为您提供更高效、稳定的创作环境

社区富文本&Markdown编辑器全新改版上线，欢迎大家体验!

诚挚邀请您参与本次调研，分享您的真实使用感受与建议。您的反馈至关重要，感谢您的支持与参与！

社区新版编辑器体验调研

如何使用Java生成PDF文档中页面的缩略图？

问PDF页面的缩略图(Java)
EN

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问PDF页面的缩略图(Java)EN

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问PDF页面的缩略图(Java)
EN