將pdf文件轉成圖片并刪除java源代碼/**

* 將pdf轉成img

*/

public static void changePdfToImg() {

try {

File file = new File("E:\\test\\baseInfo_2.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 ImageObserver

true, // fill background with white

true // 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);

FileOutputStream out = new FileOutputStream("E:\\test\\img\\" + i + ".jpg"); // 輸出到文件流

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

JPEGEncodeParam param2 = encoder.getDefaultJPEGEncodeParam(tag);

param2.setQuality(1f, false);// 1f是提高生成的圖片質量

encoder.setJPEGEncodeParam(param2);

encoder.encode(tag); // JPEG編碼

out.close();

}

channel.close();

raf.close();

unmap(buf);//如果要在轉圖片之后刪除pdf，就必須要這個關閉流和清空緩沖的方法

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

/**

* 清空緩沖

* @param buffer

*/

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;

}

});

}

總結

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