使用 CG3Y 下载，可以改成下载txt到本地.
FORM CREATE_TESTFILE.
DATA: L_BUFFER(),
L_OFF LIKE SY-TABIX,
L_LEN LIKE SY-TABIX,
L_SUM LIKE SY-TABIX.
FIELD-SYMBOLS: <L_SYM>. OPEN DATASET DSN
FOR APPENDING IN TEXT MODE
ENCODING DEFAULT.
IF SY-SUBRC <> .
MESSAGE S619 WITH DSN.
EXIT.
ENDIF. CLEAR: L_BUFFER, L_OFF.
LOOP AT DYNPRO_FIELDS.
L_LEN = DYNPRO_FIELDS-LENGTH.
L_SUM = L_LEN + L_OFF.
IF L_SUM > OR L_LEN = .
MESSAGE A604 WITH 'CREATE_TESTFILE' L_SUM.
ENDIF.
ASSIGN L_BUFFER+L_OFF(L_LEN) TO <L_SYM>.
<L_SYM> = DYNPRO_FIELDS-FIELDVALUE.
ADD DYNPRO_FIELDS-LENGTH TO L_OFF.
ENDLOOP. TRANSFER L_BUFFER TO DSN LENGTH L_OFF. CLOSE DATASET DSN.
ENDFORM. "CREATE_TESTFILE