介绍 java可以用来干什么 package core.util;
,
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 int changePdfToImg (String instructiopath String picturepath), {
,int countpage =0;
,try {
,//instructiopath =癉:/instructio/2015-05-16/Android 4编程入门经典.pdf"
,//picturepath =,“D:/instructio/图片/2015-05-16/?;
,
,File File =, new 文件(instructiopath);
,RandomAccessFile raf =, new RandomAccessFile(文件,,“r");
,FileChannel channel =, raf.getChannel ();
,MappedByteBuffer buf =, channel.map (FileChannel.MapMode.READ_ONLY,
,,0,channel.size ());
,PDFFile PDFFile =, new PDFFile (buf);
,//创建图片文件夹
,File dirfile =, new 文件(picturepath);
如果才能(! dirfile.exists ()) {
dirfile.mkdirs才能();
,}
,//获得图片页数=,,countpage pdffile.getNumPages ();
,for (int 小姐:=,1;,小姐:& lt;=, pdffile.getNumPages();,我+ +),{
,PDFPage page =, pdffile.getPage(我);
,Rectangle rect =, new 矩形(0,0,((int), page.getBBox ()
.getWidth才能()),((int), page.getBBox () .getHeight ()));
,int n =, 2;
,/* *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,
矩形才能,,/* *,放pdf到大n倍,创建图片只*/空,才能,/* *,null for 从而ImageObserver */,,真的,,/* *,fill background with white */true 才能;/* *,block until 管理;is done */,);
,BufferedImage tag =, new BufferedImage (rect.width *, n,
rect.height 才能;*,n, BufferedImage.TYPE_INT_RGB);
,tag.getGraphics () .drawImage (img, 0, 0,, rect.width *, n,
rect.height 才能;*,n, null);/* *
*,才能File imgfile =, new 文件(“D: \ \ \ \ mybook \ \ FilesNew \ \ img \ \“, +
*,才能小姐:+,“.jpg");,如果(imgfile.exists ()) {
*才能,如果(imgfile.createNewFile ()), {, System.out.println(“创建图片:“+
*,才能“D: \ \ \ \ mybook \ \工作FilesNew \ \ img \ \“, +,小姐:+,“.jpg");,}, {else
*,才能System.out.println(“创建图片失败!“),,},}
,*/,FileOutputStream out =, new FileOutputStream (picturepath +“/? +,我
+,才能“.png");
,/* *输出到文件流,*/,JPEGImageEncoder encoder =, JPEGCodec.createJPEGEncoder(出);
,JPEGEncodeParam param2 =, encoder.getDefaultJPEGEncodeParam(标签);
,param2.setQuality (1 f,,真的);
,/* * 1 ~ 0.01 f是提高生成的图片质量,*/,encoder.setJPEGEncodeParam (param2);
,encoder.encode(标签);
,/* * JPEG编码,*/,out.close ();
,}
,channel.close ();
,raf.close ();
,映射(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 ();
,}
,return countpage;
,
,}
,
,@SuppressWarnings (“unchecked")
,public static void 映射(final Object 缓冲区),{
,AccessController.doPrivileged (new PrivilegedAction (), {
,public Object run (), {
,try {
Method 才能;getCleanerMethod =, buffer.getClass () .getMethod (
“cleaner",才能,new 类[0]);
getCleanerMethod.setAccessible才能(真正的);
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本篇文章为大家展示了使用java怎么将pdf按页转换为图片,内容简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。
java主要应用于:1。网页开发;2。Android开发;3。客户端开发;4。网页开发;5。企业级应用开发;6。Java大数据开发;7。游戏开发等。
