The standard way to get PDDocumentInformation and PDDocumentCatalog is
through the following code:

    PDDocument doc = PDDocument.load(inputStream);
    PDDocumentInformation info = doc.getDocumentInformation();
    PDDocumentCatalog cat = doc.getDocumentCatalog();

What I want to do with PDF file is only to get properties such as the number
of pages and the modification date. I don't need anything else.  And I often
need to parse some big PDF files. It seems that the above code loads the
whole input stream for PDF file. Is there a faster way to get these
properties? Thanks.

-- 
Jingguo

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