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copied!<p>Don't use <code>ObjectOutputStream</code>. It's for writing serialized Java objects, not for writing raw binary data. It may indeed block the stream. Rather just write directly to the <code>OutputStream</code> of the URL connection.</p> <p>That said, the code looks pretty overcomplicated. Even after re-reading several times and blinking my eyes countless times, I can't get it right. I suggest you to send those files according the <code>multipart/form-data</code> encoding with help of <a href="http://hc.apache.org/httpcomponents-client/index.html" rel="nofollow noreferrer">Commons HttpClient</a>. You can find <a href="http://www.java-tips.org/other-api-tips/httpclient/how-to-use-multipart-post-method-for-uploading.html" rel="nofollow noreferrer">here</a> a basic code example. You just have to modify <code>Part[] parts</code> to include all the files. The servlet on the other side can in turn use <a href="http://commons.apache.org/fileupload" rel="nofollow noreferrer">Commons FileUpload</a> to parse the <code>multipart/form-data</code> request.</p> <p>To calculate the progress, I'd suggest to pick <a href="http://commons.apache.org/io/apidocs/org/apache/commons/io/output/CountingOutputStream.html" rel="nofollow noreferrer"><code>CountingOutputStream</code></a> of <a href="http://commons.apache.org/io" rel="nofollow noreferrer">Commons IO</a>. Just wrap the <code>OutputStream</code> with it and write to it.</p> <p><strong>Update:</strong> if you don't like to ship your applet with more 3rd party libraries (which I imagine is reasonable), then have a look at <a href="https://stackoverflow.com/questions/2477449/simple-stream-read-write-question-in-java/2478127#2478127">this code snippet</a> (and the original question mentioned as 1st link) how to create a <code>multipart/form-data</code> body yourself using <code>URLConnection</code>.</p>

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