servlet jsp上传文件为空 upload.parseRequest(request)；为空

List<FileItem> Items = upload.parseRequest(request);为空时

看看jsp页面代码细节1

要有enctype="multipart/form-data"

<form  action="/upload" method="post" enctype="multipart/form-data">

细节2

要有name

<input type="file" class="form-control" multiple  name="spic" id="spic">