JSP:

jquery.min.jsjquery.validate.min.jsadditional-methods.min.js<formrole="form"class="form-horizontal"action="u.action"method="post"enctype="multipart/form-data"><inputtype="file"name="file"class="form-control"id="file"accept=".csv"placeholder="Pleaseselectacsvfile"></form>


JS:

$('.form-horizontal').validate({rules:{file:{required:true,extension:'csv',accept:'text/csv,text/comma-separated-value,application/vnd.ms-excel,application/vnd.msexcel,application/csv'}},messages:{file:{required:"Acsvfileisrequired.",accept:"Thefiletypemustbe'CSV'."}}});