20140526-一个从pdf转换成图片的类，工作当中有用到

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;

publicclass PDFchangToImage {

    publicstaticvoid
main(String[] args)
{

        PDFchangToImage.changePdfToImg();

    }

    privatestaticvoid
changePdfToImg() {

        try {

            File
file =
new
File("E:\\679162c2.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 (inti = 1; i <= pdffile.getNumPages(); i++) {

                PDFPage
page =
pdffile.getPage(i);

                Rectangle
rect =
new
Rectangle(0, 0, ((int)
page.getBBox()

                        .getWidth()),
((int)
page.getBBox().getHeight()));

                intn = 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("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")

    privatestaticvoid
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();

                }

                returnnull;

            }

        });

    }

}