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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (Jira)" <ji...@apache.org> on 2021/06/16 07:09:00 UTC
[jira] [Commented] (PDFBOX-5217) PDF to picture, take up too much memory,easy OOM
[ https://issues.apache.org/jira/browse/PDFBOX-5217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17364107#comment-17364107 ]
Tilman Hausherr commented on PDFBOX-5217:
-----------------------------------------
Please attach the PDF. And you can open the file directly, you don't have to open it as a stream from an URL. And tell what dpi you're using.
> PDF to picture, take up too much memory,easy OOM
> ------------------------------------------------
>
> Key: PDFBOX-5217
> URL: https://issues.apache.org/jira/browse/PDFBOX-5217
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.24, 3.0.0 JBIG2
> Environment: Oracle JDK 1.8.0_291-b10
> MacOS BigSur (CPU i5, RAM8GB)
> Windows 10 (CPU i7 2.80GHz, RAM 16GB)
> Reporter: lanshiqin
> Priority: Critical
>
> Conversion of a 20MB PDF file to an image resource consumes more than 8GB of memory and takes 5 minutes. That's an intolerable fact.
> Debug found that the memory soared when the file stream was finally read.
> This is my code:
>
> {code:java}
> try(InputStream in = new URL(pdfFileUrl).openStream();
> PDDocument document = PDDocument.load(in, MemoryUsageSetting.setupTempFileOnly())){
> document.setResourceCache(null);
> PDFRenderer renderer = new PDFRenderer(document);
> List<String> imgUrlList = Lists.newArrayList();
> for (int i = 0; i < document.getNumberOfPages(); i++) {
> BufferedImage bufferedImage = renderer.renderImageWithDPI(i, DPI);
> File tempFile = new File(OFFICE_CONVERT_TEMP_DIR + fileName + "_" + i);
> try {
> ImageIO.write(bufferedImage, "png", tempFile);
> imgUrlList.add("upload to media center get url todo "+i);
> } finally {
> FileUtils.deleteQuietly(tempFile);
> bufferedImage.getGraphics().dispose();
> }
> }
> return imgUrlList;
> }
> {code}
>
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