电脑软件
名称： 需要一个jar PDFRend
大小： 2MB 类别： 开发工具 语言： 中文
应用平台： 需要jar PDFRenderer-0.9.0.jar
package com.jako.database.model;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:\\01000022&0140&00001.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())); int n = 6;/**图片清晰度（n>0且n<7）【pdf放大参数】*/ Image img = page.getImage(rect.width*n, rect.height*n, rect, /**放大pdf到n倍，创建图片。*/ null, /**null for the ImageObserver */ true, /** fill background with white */ true /** block until drawing is done */ ); BufferedImage tag = new BufferedImage(rect.width*n, rect.height*n, BufferedImage.TYPE_INT_RGB); tag.getGraphics().drawImage(img, 0, 0, rect.width*n, rect.height*n, 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:\\" + i + "1003.jpg"); /** 输出到文件流*/ JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); JPEGEncodeParam param2 = encoder.getDefaultJPEGEncodeParam(tag); param2.setQuality(1f, true);/**1f~0.01f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(); } } @SuppressWarnings("unchecked") private static void unmap(final Object buffer) { AccessController.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; } }); } }