转jpg java源程序_将pdf文件转成图片并删除java源代码
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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