本文实例为大家分享了java实现pdf按页转换为图片的具体代码，供大家参考，具体内容如下

本程序是利用jacob.jar包实现的，关于jacob.jar的配置见我上一篇文章，程序中可配置参数选择图片清晰图。

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 ="D:/instructio/2015-05-16/Android 4编程入门经典.pdf"

//picturepath = "D:/instructio/picture/2015-05-16/";

File file = new File(instructiopath);

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);

//创建图片文件夹

File dirfile = new File(picturepath);

if(!dirfile.exists()){

dirfile.mkdirs();

}

//获得图片页数

countpage = pdffile.getNumPages();

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 = 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,

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(picturepath+"/" + i

+ ".png");

/** 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();

}

return countpage;

}

@SuppressWarnings("unchecked")

public 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;

}

});

}

}

如果需要将word转pdf，也可参考我上一篇文章。