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file multiple on file hidden

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Hello everybody, I need copy each item from one multiple file in separated simples type file, and submit them to the server (tomcat, jsp). My code en jsp:

1) input multiple="multiple" type="file" id="fileMultiple" ...

2) 10 different input type="file" name="file_hidden_1 (2, 3, ...)"

3) In jscript, inside a iteration for(var i=0; ...

3.1) document.getElementById('file_hidden_' + (i+1)).files[0] = ficMultiple.files.item(i);

I do this for to submit each file via ajax (DWR3; FileTransfer) using only one user selection of files. But the files arrive to the server without name and 0 bytes.

The question: Somebody make this 3.1) line correctly? I attempt too modify the value of each hidden but don't works. Any idea?

Thanks in advance.
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