groovy - Grails how to parse text file? -

I want the user to upload a file within the form and open the file on submission and read each row in sequence To get information about it to store in the database So far, I'm able to create only one object and remove it from it.

  def upload file = request.getFile ('name_of_file')   
 it gets me a commons multipurpose file, but I'm not sure that the file Need to stream in buffer, or save the file to a temporary folder and then try opening it like this  
  uploadedFile.getbytes ()  will give me an array [71] , 101, 110, 101, 114, 97, 108, 13, 10, 45, 45, 45, 45, 45, 45, 45, 13, 10, 83, 116 ....] that is not in one form, I can do anything.  
 I should be able to open the file and read it row by row. Can I do it with the Commons Multipartfile - its options seem like limited   
 
 
  commonsultiplepart file < There is a getInputStream () method in  inputstream  on which you can call a Groovy enhancement, for example:  
  request.getFile (' Name_of_file '). Inputstream.eachLine {line -> / * Parsing logic * /}