code: public URL findResource(String fileName) {
  		Object location = this.mixedResourceLocations.get(fileName);
  		if (location == null) {
  			return super.findResource(fileName);
  		}
  		String url;
  		if (location instanceof File) {
  			url = "file:/" + FileSupport.convertToUnixStylePath(((File) location).getAbsolutePath());
  		} else {
  			url = "jar:file:" + FileSupport.convertToUnixStylePath((String) location) + "!/" + fileName;
  		}
  		try {
  			return new URL(url);
  		} catch (MalformedURLException e) {
  			throw new ResourceException(e);
  		}
  	}
docs: Retrieves resource as input stream from a directory or jar in the filesystem.
  
  @param fileName
  @return