I want to upload a zip file through a custom plugin, not getting a solution for it ?

[N P]

I am developing a plugin to upload a zip file but not getting option, please help.

here is the form

<form class="aui" action = "$req.contextPath/secure/UnzipAction.action?key=$action.space.key" method ="post" enctype="multipart/form-data">

<h2>Import Space Data </h2>
<fieldset style="margin-top: 20px;margin-bottom: 10px;">
<legend><span>Choose file</span></legend>
<div>
<label>Upload
file</label>
<input class="upfile" type="file" id="file_upload" name="file_upload">
</div>

</fieldset>
<button class="aui-button aui-button-primary">Import</button>

</form>