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copied!<p>Sending files over HTTP is supposed to take place using <code>multipart/form-data</code> encoding. Your servlet part is fine as it already uses <a href="http://commons.apache.org/fileupload" rel="nofollow noreferrer">Apache Commons FileUpload</a> to parse a <code>multipart/form-data</code> request.</p> <p>Your client part, however, is apparently not fine as you're seemingly writing the file content raw to the request body. You need to ensure that your client sends a proper <code>multipart/form-data</code> request. How exactly to do it depends on the API you're using to send the HTTP request. If it's plain vanilla <code>java.net.URLConnection</code>, then you can find a concrete example somewhere near the bottom of <a href="https://stackoverflow.com/questions/2793150/how-to-use-java-net-urlconnection-to-fire-and-handle-http-requests/2793153#2793153">this answer</a>. If you're using <a href="http://hc.apache.org/httpcomponents-client-ga/" rel="nofollow noreferrer">Apache HttpComponents Client</a> for this, then here's a concrete example:</p> <pre><code>HttpClient client = new DefaultHttpClient(); HttpPost post = new HttpPost(url); MultipartEntity entity = new MultipartEntity(); entity.addPart("file", new FileBody(file)); post.setEntity(entity); HttpResponse response = client.execute(post); // ... </code></pre> <hr> <p><strong>Unrelated</strong> to the concrete problem, there's a bug in your server side code:</p> <pre><code>File file = new File("\files\\"+item.getName()); item.write(file); </code></pre> <p>This will potentially overwrite any previously uploaded file with the same name. I'd suggest to use <a href="http://download.oracle.com/javase/6/docs/api/java/io/File.html#createTempFile%28java.lang.String,%20java.lang.String,%20java.io.File%29" rel="nofollow noreferrer"><code>File#createTempFile()</code></a> for this instead.</p> <pre><code>String name = FilenameUtils.getBaseName(item.getName()); String ext = FilenameUtils.getExtension(item.getName()); File file = File.createTempFile(name + "_", "." + ext, new File("/files")); item.write(file); </code></pre>

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