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Grails 3 File Upload
// In your controller, use the following code
// Single file
def file = request.getFile("identifier_name_in_html_tag_attribute")
// Useful information
file.class // => class$StandardMultipartFile // the name attribute value you used above (comes from html input tag)
file.contentType // e.g. "image/png"
// Multiple files
request.getFiles("pictures[]").each {
// use closure parameter if you don't want to use "it"
//file -> println(file.originalFilename)
println it.originalFilename
// This also works:
request.multiFileMap.get("pictures[]").each {
print it.originalFilename
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