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    <p>Can't you use the constructor that takes a <code>Model</code> as argument? And make the <code>Model</code> generate the <code>File</code> in its <code>getObject()</code>. A <code>LoadableDetachableModel</code> is a good choice, given that <code>load()</code>, and therefore file generation, will be invoked only once.</p> <p>If the file is to be freshly generated every time the link is clicked, use <a href="http://wicket.apache.org/apidocs/1.4/org/apache/wicket/markup/html/link/DownloadLink.html#setDeleteAfterDownload(boolean)" rel="noreferrer"><code>DownloadLink.setDeleteAfterDownload(true)</code></a> to ensure the File is automatically deleted once it is served.</p> <p>I don't use 1.4, but the source code in 1.3 shows that the <code>File</code> is retrieved by means of <code>getModelObject()</code> in the <code>onClick()</code> method of the <code>Link</code>.</p> <pre><code>IModel fileModel = new AbstractReadOnlyModel(){ public Object getObject() { return generateFile(); } }; DownloadLink link = new DownloadLink(linkId, fileModel, "report.pdf"); </code></pre> <p>Source code of <a href="http://wicket.apache.org/apidocs/1.4/org/apache/wicket/markup/html/link/DownloadLink.html#onClick()" rel="noreferrer"><code>DownloadLink.onClick()</code></a></p> <pre><code>public void onClick() { final File file = (File)getModelObject(); ... IResourceStream resourceStream = new FileResourceStream( new org.apache.wicket.util.file.File(file)); getRequestCycle().setRequestTarget(.../* uses resourceStream */...); } </code></pre>
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    1. POHow to use Wicket's DownloadLink with a file generated on the fly?
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    1. USXavi López
    1. USXavi López
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    1. POHow to use Wicket's DownloadLink with a file generated on the fly?
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    1. COYou could also override the onClick of DownloadLink and do a `setModelObject()` before calling the super method. Xavi's suggestion is much cleaner, though.
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      1. USjbrookover
    2. CO1. Use a `LoadableDetachableModel` instead. `getObject()` may be called multiple times during a request, but `load()` won't; 2. if the file is always re-generated, you may call `downloadLink.setDeleteAfterDownload(true)`, so you don't have to worry about deleting the temp file afterwards.
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      1. UStetsuo
    3. CO@tetsuo Thanks for your valuable comments. I've updated the answer with your recommendations.
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      1. USXavi López
 

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