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    <p>This doesn't directly answer your question, but it is (IMO) worth saying anyway ... </p> <p>If your homework assignment doesn't <strong>specifically tell</strong> you to use a socket directly, there are simpler, and better ways of doing HTTP file upload and download in Java:</p> <ul> <li><p>Using <a href="http://download.oracle.com/javase/6/docs/api/java/net/URL.html#openConnection%28%29" rel="nofollow"><code>java.net.URL.openConnection()</code></a> on an "http:" url will give you an <a href="http://download.oracle.com/javase/6/docs/api/java/net/HttpURLConnection.html" rel="nofollow"><code>HttpURLConnection</code></a> that you can use to make GET, PUT, POST and so on requests to the remote server. This takes care of the basic HTTP protocol stuff for you.</p></li> <li><p>The <a href="http://hc.apache.org/httpcomponents-client-ga/index.html" rel="nofollow">Apache HttpClient</a> libraries do the same thing, but in a more sophisticated way, with more options and more hooks for things like handling content (including forms and MIME multiparts), connection and credential management, proxying and route finding and so on.</p></li> </ul> <p>If the aim of your homework exercise is to teach you practical ways to talk to remote servers, then using these classes is far more practical than trying to implement a subset of the HTTP protocol from the socket level up.</p> <p>(Of course, the aim <em>could</em> be to give you a deeper understanding of the HTTP protocol at the "wire" level ... which would make your current approach the right one.)</p>
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    1. POHow to download a file from a server using Java Socket?
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    1. USStephen C
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    1. COUnfortunatelly we are not allowed to use anything other than Socket
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