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copied!<p>You can use the <code>mime type</code> instead of trying to guess by the file extensions, that may be missing in some cases. Here are the options to establish the <code>mime type</code> of a file:</p> <ol> <li><p>Using <code>javax.activation.MimetypesFileTypeMap</code>, like:</p> <pre><code>System.out.println("Mime Type of " + f.getName() + " is " + new MimetypesFileTypeMap().getContentType(f)); </code></pre></li> <li><p>Using <code>java.net.URL</code></p> <pre><code>URL u = new URL(fileUrl); URLConnection uc = u.openConnection(); type = uc.getContentType(); </code></pre></li> <li><p>Using <code>Apache Tika</code></p> <pre><code>ContentHandler contenthandler = new BodyContentHandler(); Metadata metadata = new Metadata(); metadata.set(Metadata.RESOURCE_NAME_KEY, f.getName()); Parser parser = new AutoDetectParser(); // OOXMLParser parser = new OOXMLParser(); parser.parse(is, contenthandler, metadata); System.out.println("Mime: " + metadata.get(Metadata.CONTENT_TYPE)); System.out.println("Title: " + metadata.get(Metadata.TITLE)); System.out.println("Author: " + metadata.get(Metadata.AUTHOR)); System.out.println("content: " + contenthandler.toString()); </code></pre></li> <li><p>Using <code>JMimeMagic</code></p> <pre><code>MagicMatch match = parser.getMagicMatch(f); System.out.println(match.getMimeType()) ; </code></pre></li> <li><p>Using <code>mime-util</code></p> <pre><code>Collection<?> mimeTypes = MimeUtil.getMimeTypes(f); </code></pre></li> <li><p>Using <a href="http://droid.sourceforge.net/wiki/index.php/Introduction" rel="noreferrer">DROID</a></p> <pre><code>Droid (Digital Record Object Identification) is a software tool to perform automated batch identification of file formats. </code></pre></li> <li><p><a href="http://aperture.wiki.sourceforge.net/Overview" rel="noreferrer">Aperture</a> framework</p> <pre><code>Aperture is an open source library and framework for crawling and indexing information sources such as file systems, websites and mail boxes. </code></pre></li> </ol> <p>See <a href="http://www.rgagnon.com/javadetails/java-0487.html" rel="noreferrer">Get the Mime Type from a File</a> for more details for each of the above options. </p> <p>In this case the easiest way is to use the first solution, <code>javax.activation.MimetypesFileTypeMap</code>, like:</p> <pre><code>MimetypesFileTypeMap mtft = new MimetypesFileTypeMap(); String mimeType = mtft.getContentType(ze.getName()); System.out.println(ze.getName()+" type: "+ mimeType); </code></pre>

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