How to convert PDF-files to PNG-images concurrently?

Asked Apr 07 '20 at 05:43

Active Apr 07 '20 at 07:57

Viewed 367 times

I have a scenario, where I need to convert multiple PDF-files to PNG-images concurrently. Although it can be doable using Java 8 Parallel Streams, I need it to be executed on Java 7.

This is the snippet which I use to convert PDF to PNG without parallel processing and by using PDFBox.

PDDocument document = PDDocument.load(new File(pdfFilename));
PDFRenderer pdfRenderer = new PDFRenderer(document);
for (int page = 0; page < document.getNumberOfPages(); ++page)
{ 
   BufferedImage bim = pdfRenderer.renderImageWithDPI(page, 300, ImageType.RGB);
   ImageIOUtil.writeImage(bim, pdfFilename + "-" + (page+1) + ".png", 300);
}
document.close();

Kindly, please suggest some approach to tackle this.

edited Apr 07 '20 at 06:10

user3666197

asked Apr 07 '20 at 05:43

origin

... does it work? – Stultuske Apr 07 '20 at 05:45
@Stultuske may be with threads atleast. – origin Apr 07 '20 at 05:47
1

Thread pools were available in jdk7. This is not really pdfbox related, just take care that each thread uses its own PDDocument objects, and make sure to use the latest PDFBox version (2.0.19). – Tilman Hausherr Apr 07 '20 at 07:26

How to convert PDF-files to PNG-images concurrently?

0 Answers0