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POMultipart/form-data how to get parameter hidden
 

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    <p>I 'm working on a web application. I have my jsp with enctype="multipart/form-data" and when I submit my request, I am unable to get the request parameters in servlet.</p> <p>The getParameter() calls will all return null. The question is how can overcome this problem?</p> <p>When it 's not enctyped, this code works fine. I know that this has been asked many times, but I did not find any straight answer</p> <p><strong>JSP</strong></p> <pre><code>&lt;form action="upload" method="post" enctype="multipart/form-data"&gt; &lt;input type="file" name="uploadfile[]" id="uploadfile" size="50" multiple="true" /&gt; &lt;br/&gt;&lt;br/&gt; &lt;input type="hidden" name ="e_id" value= &lt;%=userBean.getEid%&gt; /&gt; &lt;input type="hidden" name ="Uid" value= &lt;%=userBean.getUid()%&gt; /&gt; &lt;input type="submit" name ="button1" value="Upload" /&gt; &lt;/form&gt; </code></pre> <p><strong>Servlet</strong></p> <pre><code>@Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { int e_id =0; String uid = null; HttpSession session1 = request.getSession(true); if(ServletFileUpload.isMultipartContent(request)){//process only if its multipart content try { List&lt;FileItem&gt; multiparts = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request); for(FileItem item : multiparts) { if(!item.isFormField()) { String name = new File(item.getName()).getName(); item.write( new File(UPLOAD_DIRECTORY + File.separator + name)); e_id = Integer.parseInt(request.getParameter("e_id")); uid = request.getParameter("Uid"); } else {} ... </code></pre>
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    1. COThe data is hidden in the request `InputStream`. Check [this](http://stackoverflow.com/questions/19374345) out.
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      1. USNikos Paraskevopoulos
    2. COIt's in that `else {}` block - when `item.isFormField()`
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      1. USIan Roberts
    3. CO@NikosParaskevopoulos interesting method, but the variable **map** returns only this `Content-Disposition: form-data; name="uploadfile[]"; filename}` and as a result I cannot use `map.get("id")`, which could be a solution to my problem.
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