Upload File from SAP Application Server using ABAP

Use the following steps to upload data from a file in SAP application server to ABAP internal table.

1. Declare a ABAP internal table.
2. Use OPEN DATASET ABAP statement to open file on appliction server.
3. Use READ DATASET ABAP statement to read each line in the file to workarea. Append work area data to internal table.
4. Use CLOSE DATASET ABAP statement to close the application server file.
5. Process the data in the internal table.

Below program uses OPEN DATASET, READ DATASET and CLOSE DATASET statements  to upload the file.

*----------------------------------------------------------------------*
*     Data Decalaration
*----------------------------------------------------------------------*
DATA: gt_spfli  TYPE TABLE OF spfli,
      gwa_spfli TYPE spfli.
DATA: gv_file   TYPE rlgrap-filename.

*----------------------------------------------------------------------*
*     START-OF-SELECTION
*----------------------------------------------------------------------*
PERFORM read_file.
PERFORM display_data.

*&---------------------------------------------------------------------*
*&      Form  read_file
*&---------------------------------------------------------------------*
FORM read_file.
  DATA: lv_data TYPE string.

*Move complete path to filename
  gv_file = 'spfli.txt'.

*Open the file in application server to read the data
  OPEN DATASET gv_file FOR INPUT IN TEXT MODE ENCODING DEFAULT.
  IF sy-subrc NE 0.
    MESSAGE 'Unable to open file' TYPE 'I'.
  ENDIF.
  DO.
*  Loop through the file, if a record is found move it
*  to temporary structure else exit out of the loop.
    READ DATASET gv_file INTO lv_data.
    IF sy-subrc = 0.
*  Split the fields in temporary structure to corresponding
*  fields in workarea.
      SPLIT lv_data AT ',' INTO gwa_spfli-carrid
                                  gwa_spfli-connid
                                  gwa_spfli-countryfr
                                  gwa_spfli-cityfrom
                                  gwa_spfli-airpfrom
                                  gwa_spfli-countryto
                                  gwa_spfli-cityto
                                  gwa_spfli-airpto
                                  gwa_spfli-arrtime.
      APPEND gwa_spfli TO gt_spfli.
      CLEAR gwa_spfli.
    ELSE.
      EXIT.
    ENDIF.
  ENDDO.
*Close the file
  CLOSE DATASET gv_file.

ENDFORM.                    " read_file

*&---------------------------------------------------------------------*
*&      Form  DISPLAY_DATA
*&---------------------------------------------------------------------*
FORM display_data .
  LOOP AT gt_spfli INTO gwa_spfli.
    WRITE:/ gwa_spfli-carrid,
            gwa_spfli-connid,
            gwa_spfli-countryfr,
            gwa_spfli-cityfrom,
            gwa_spfli-airpfrom,
            gwa_spfli-countryto,
            gwa_spfli-cityto,
            gwa_spfli-airpto,
            gwa_spfli-arrtime.
    CLEAR: gwa_spfli.
  ENDLOOP.
ENDFORM.                    " DISPLAY_DATA

When you execute the above program reads the data from the file in application server and displays the following output.