java - Multiple file upload with Spring 3 -

i need load unknown number of files @ once. found example, , works known amount of files:

markup:

<form  method="post" enctype="multipart/form-data"> <input name="files[0]" type="file" /> <input name="files[1]" type="file" /> <input type="submit" value="send"/> </form> 

code:

@requestmapping(method = requestmethod.post) public string savephoto(@modelattribute("album") album album,  bindingresult result, sessionstatus status,  multipartfileuploadbean file)  {     list<multipartfile> images = file.getfiles();     (multipartfile photo : images) {     ...          }     return "redirect:/albums/"+album.getid(); } 

multipartfileuploadbean:

public class multipartfileuploadbean {     private list<multipartfile> files;      public void setfiles(list<multipartfile> files) {         this.files = files;}      public list<multipartfile> getfiles() {         return files;} } 

yes, works, not know how user wants upload photo in album. , use:

<input name="files[]" type="file" multiple="multiple" /> 

i'll error.

request processing failed; nested exception java.lang.numberformatexception: input string: ""

i looking how use multiple = "multiple", found none. hope help.

in xhtml:

<input name="files" type="file" multiple="multiple" /> 

alter request-mapped method:

@requestmapping(method = requestmethod.post) public string savephoto(multipartrequest multipartrequest, ...) {     list<multipartfile> images = multipartrequest.getfiles("files");     ... }