调整

app/controllers/homework_commons_controller.rb

@@ -212,7 +212,7 @@ class HomeworkCommonsController < ApplicationController
             format.xlsx{
               student_work_to_xlsx(@work_excel,@homework)
               exercise_export_name = "#{current_user.real_name}_#{@course.name}_#{@homework.name}_#{Time.now.strftime('%Y%m%d_%H%M%S')}"
-              render xlsx: "#{exercise_export_name.strip.first(30)}",template: "homework_commons/works_list.xlsx.axlsx",locals:
+              render xlsx: "#{exercise_export_name.strip}",template: "homework_commons/works_list.xlsx.axlsx",locals:
                   {table_columns: @work_head_cells,task_users: @work_cells_column}
             }
           end