Springmvc multipartfile File Upload

About SPRINGMVC multipartfile File upload problem, I put the code here

JSP page

Control layer

@RequestMapping ("/edit")
@ResponseBody public Json edit (tgoodcategory goodcategory,httpservletrequest request,@ Requestparam (value= "file", Required=false) multipartfile file) {
	if (file!=null) {
		String s= Uploadfile.loadpicture (file, "CPSM", request);
		Goodcategory.setinstruction ("file/" +s);
	JSON j = new JSON ();
	try{
		j.setsuccess (true);
		J.setobj (Goodcategoryservice.edit (goodcategory));
		J.setmsg ("Edit succeeded!");
	} catch (Exception ex) {
		ex.printstacktrace ();
		J.setmsg ("Edit failed!");
	}
	return j;

}

File Upload Tool class

/** * Files Upload * @param file foreground file * @param name Store name prefix * @param request HttpServletRequest * @return Database storage field Name: name+ Current Time */
	public static string LoadPicture (Multipartfile file, string Name,httpservletrequest request) {string s= "";
	SimpleDateFormat SDF = new SimpleDateFormat ("Yyyymmddhhmmss");
		if (!file.isempty ()) {byte[] bytes;

			try {bytes = File.getbytes ();
			String RootPath = Request.getsession (). Getservletcontext (). Getrealpath ("file");
				
				
			File dir = new file (RootPath + file.separator);
			if (!dir.exists ()) {dir.mkdirs ();
			}//string Path=dir.getabsolutepath () + File.separator + file.getoriginalfilename ();
			String[] T=file.getoriginalfilename (). split ("\ \");
			String Picturetype=t[t.length-1]; String Picturename=name+sdf.format (New Date ()) + "."
			+picturetype;
			String Path=dir.getabsolutepath () + File.separator +picturename;
				
			S=picturename;
			File Serverfile = new file (path);
			Bufferedoutputstream stream; stream = new BufferedoutPutstream (New FileOutputStream (Serverfile));
			Stream.Write (bytes);
			Stream.Close ();
			return picturename; } catch (Exception e) {//TODO auto-generated catch block System.out.println ("Fileload Error ...:" +e.getmessage ())
			;
}} return S; }

Configuration file for Springmvc

<bean id= "Multipartresolver"  
        class= "Org.springframework.web.multipart.commons.CommonsMultipartResolver" >  
        <!--default encoding--
        <property name= "defaultencoding" value= "Utf-8"/>  
        <!--file size max--
        <property name= "maxuploadsize" value= "10485760000"/>  
        <!--max in memory--
        <property name= " Maxinmemorysize "value=" 40960 "/>  
</bean>