java 将PDF 转化为图片
需要一个jar PDFRenderer-0.9.0.jar
http://java.net/downloads/pdf-renderer/PDFRenderer-0.9.0.jar

package com.mybook.demo;import java.awt.Image;import java.awt.Rectangle;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.RandomAccessFile;import java.lang.reflect.Method;import java.nio.MappedByteBuffer;import java.nio.channels.FileChannel;import java.security.AccessController;import java.security.PrivilegedAction;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGEncodeParam;import com.sun.image.codec.jpeg.JPEGImageEncoder;import com.sun.pdfview.PDFFile;import com.sun.pdfview.PDFPage;public class PDFchangToImage {public static void main(String[] args){PDFchangToImage.changePdfToImg();}private static void changePdfToImg() {try {File file = new File("D:\\work\\mybook\\Files\\深入浅出General System V3.3.pdf");RandomAccessFile raf = new RandomAccessFile(file, "r");FileChannel channel = raf.getChannel();MappedByteBuffer 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, rect,null, // null for the ImageObservertrue, // fill background with whitetrue // 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);//File imgfile = new File("D:\\work\\mybook\\FilesNew\\img\\" + i + ".jpg");//if(imgfile.exists()){//if(imgfile.createNewFile())//{//System.out.println("创建图片："+"D:\\work\\mybook\\FilesNew\\img\\" + i + ".jpg");//} else {//System.out.println("创建图片失败！");//}//}FileOutputStream out = new FileOutputStream("D:\\work\\mybook\\FilesNew\\img\\" + i + ".jpg"); // 输出到文件流JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);JPEGEncodeParam param2 = encoder.getDefaultJPEGEncodeParam(tag);param2.setQuality(1f, false);// 1f是提高生成的图片质量encoder.setJPEGEncodeParam(param2);encoder.encode(tag); // JPEG编码    out.close();}channel.close();raf.close();unmap(buf);//如果要在转图片之后删除pdf，就必须要这个关闭流和清空缓冲的方法} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}private static void unmap(final Object buffer) {// TODO Auto-generated method stubAccessController.doPrivileged(new PrivilegedAction() {public Object run() {try {Method getCleanerMethod = buffer.getClass().getMethod("cleaner", new Class[0]);getCleanerMethod.setAccessible(true);sun.misc.Cleaner cleaner = (sun.misc.Cleaner) getCleanerMethod.invoke(buffer, new Object[0]);cleaner.clean();} catch (Exception e) {e.printStackTrace();}return null;}});}}