grails 处理上传
HMTL
<g:form action="save" method="post" enctype="multipart/form-data" >

<input type="file" id="projectLogoPath" name="projectLogoPath" value="${fieldValue(bean:projectInstance,field:'projectLogoPath')}"/>
controller：

def f = request.getFile('projectLogoPath')
if(!f.empty) {
fileName=f.getOriginalFilename()
filePath="web-app/images/"
f.transferTo(new File(filePath+fileName) )
}