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https://issues.apache.org/jira/browse/PDFBOX-5217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17364669#comment-17364669
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lanshiqin commented on PDFBOX-5217:
-----------------------------------
One of Adobe's PDF conversion tools is more memory efficient, but it is a
Windows desktop application,and my application needs to run on a Linux server,
so I need the PDFBox library. Is there any way to further optimize the PDF
library to reduce the memory?
> Rendering takes up too much memory, easy OOM
> --------------------------------------------
>
> Key: PDFBOX-5217
> URL: https://issues.apache.org/jira/browse/PDFBOX-5217
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.24, 3.0.0 PDFBox
> Environment: Oracle JDK 1.8.0_291-b10
> MacOS BigSur (CPU i5, RAM8GB)
> Windows 10 (CPU i7 2.80GHz, RAM 16GB)
> Reporter: lanshiqin
> Priority: Major
>
> 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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