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<h1>PDFBox - PDF File References</h1>
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<a href="#File+Specification">File Specification</a>
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<a name="N1000C"></a><a name="File+Specification"></a>
<h2 class="boxed">File Specification</h2>
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See package:<a href="../javadoc/org/pdfbox/pdmodel/common/filespecification/package-summary.html">org.pdfbox.pdmodel.common.filespecification</a>
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See example:<a href="../javadoc/org/pdfbox/examples/pdmodel/EmbeddedFiles.html">EmbeddedFiles</a>
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A PDF can contain references to external files via the file system or a URL to a remote location.
It is also possible to embed a binary file into a PDF document.
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There are two classes that can be used when referencing a file.
<a href="../javadoc/org/pdfbox/examples/pdmodel/common/filespecification/PDSimpleFileSpecification.html">PDSimpleFileSpecification</a>
is a simple string reference to a file(e.g. "./movies/BigMovie.avi"). The simple file specification does not allow for any parameters to be
set. The <a href="../javadoc/org/pdfbox/examples/pdmodel/common/filespecification/PDComplexFileSpecification.html">PDComplexFileSpecification</a>
is more feature rich and allows for advanced settings on the file reference.
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It is also possible to embed a file directly into a PDF. Instead of setting the file attribute of the PDComplexFileSpecification, the
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<pre class="code">
PDEmbeddedFilesNameTreeNode efTree = new PDEmbeddedFilesNameTreeNode();
//first create the file specification, which holds the embedded file
PDComplexFileSpecification fs = new PDComplexFileSpecification();
fs.setFile( "Test.txt" );
InputStream is = ...;
PDEmbeddedFile ef = new PDEmbeddedFile(doc, is );
//set some of the attributes of the embedded file
ef.setSubtype( "test/plain" );
ef.setSize( data.length );
ef.setCreationDate( new GregorianCalendar() );
fs.setEmbeddedFile( ef );
//now add the entry to the embedded file tree and set in the document.
Map efMap = new HashMap();
efMap.put( "My first attachment", fs );
efTree.setNames( efMap );
//attachments are stored as part of the "names" dictionary in the document catalog
PDDocumentNameDictionary names = new PDDocumentNameDictionary( doc.getDocumentCatalog() );
names.setEmbeddedFiles( efTree );
doc.getDocumentCatalog().setNames( names );
</pre>
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