can read the spreadsheet each row.(need to think of a method to parse each row to figure)

vendor/built_in_modules/survey/app/controllers/panel/survey/back_end/surveys_controller.rb

@@ -1,4 +1,6 @@
 require 'csv'
+require 'iconv'
+require 'roo'
 
 class Panel::Survey::BackEnd::SurveysController < OrbitBackendController
 
@@ -90,6 +92,22 @@ class Panel::Survey::BackEnd::SurveysController < OrbitBackendController
   end
 
   def import
+    @survey = ::Survey.find(params[:id])
+    @file = params[:file]
+    
+    case File.extname(@file.original_filename)
+      when ".csv" then @spreadsheet = Roo::CSV.new(@file.path)
+      # when ".xls" then Excel.new(file.path, nil, :ignore)
+      # when ".xlsx" then Excelx.new(file.path, nil, :ignore)
+      else raise "Unknown file type: #{file.original_filename}"
+    end
+
+    @header = @spreadsheet.row(1)
+    (2..@spreadsheet.last_row).each do |i|
+          ##parse each row here 
+    end
+
+    redirect_to panel_survey_back_end_surveys_url, :notice => :success
   end
 
   def export