通过cl_dd_document来实现在ALV中输出标题头

*&---------------------------------------------------------------------*
*& Report  ZTEST_LINE
*&
*&---------------------------------------------------------------------*
*&
*&
*&---------------------------------------------------------------------*

REPORT  ZTEST_LINE.
TABLES : t001.
TYPE-POOLS: slis.

DATA : w_repid LIKE sy-repid.
TYPES : BEGIN OF ty_comp.
        INCLUDE STRUCTURE t001.
TYPES : END OF ty_comp.
DATA: wa_layout  TYPE slis_layout_alv.
DATA: it_fieldcat TYPE slis_t_fieldcat_alv,
      wa_fieldcat TYPE slis_fieldcat_alv.
DATA : it_comp TYPE TABLE OF ty_comp.

INITIALIZATION.
  w_repid = sy-repid.
START-OF-SELECTION.
  SELECT * FROM t001 INTO TABLE it_comp.
END-OF-SELECTION.
  CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
    EXPORTING
      i_program_name         = w_repid
      i_internal_tabname     = 'IT_COMP'
      I_STRUCTURE_NAME       = 'T001'
      i_inclname             = w_repid
    CHANGING
      ct_fieldcat            = it_fieldcat[]
    EXCEPTIONS
      inconsistent_interface =
      program_error          =
      OTHERS                 = .

  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
      i_callback_program          = w_repid
      i_callback_html_top_of_page = 'HTML_TOP_OF_PAGE'
      is_layout                   = wa_layout
      it_fieldcat                 = it_fieldcat
    TABLES
      t_outtab                    = it_comp
    EXCEPTIONS
      program_error               =
      OTHERS                      = .
*&---------------------------------------------------------------------*
*&      Form  html_top_of_page
*&---------------------------------------------------------------------*
FORM html_top_of_page USING document TYPE REF TO cl_dd_document.
  DATA: text TYPE sdydo_text_element.
  text =  'Company Code Data'.
  CALL METHOD document->add_text
    EXPORTING
      text      = text
      sap_style = 'HEADING'.
  CALL METHOD document->new_line.
  CALL METHOD document->new_line.
  text = 'User Name : '.
  CALL METHOD document->add_text
    EXPORTING
      text         = text
      sap_emphasis = 'Strong'.
  CALL METHOD document->add_gap
    EXPORTING
      width = .
  text = sy-uname.
  CALL METHOD document->add_text
    EXPORTING
      text      = text
      sap_style = 'Key'.
  CALL METHOD document->add_gap
    EXPORTING
      width = .
  text = 'Date : '.
  CALL METHOD document->add_text
    EXPORTING
      text         = text
      sap_emphasis = 'Strong'.
  CALL METHOD document->add_gap
    EXPORTING
      width = .
  text = sy-datum.
  CALL METHOD document->add_text
    EXPORTING
      text      = text
      sap_style = 'Key'.
  CALL METHOD document->add_gap
    EXPORTING
      width = .
  text = 'Time : '.
  CALL METHOD document->add_text
    EXPORTING
      text         = text
      sap_emphasis = 'Strong'.
  CALL METHOD document->add_gap
    EXPORTING
      width = .
  text = sy-uzeit.
  CALL METHOD document->add_text
    EXPORTING
      text      = text
      sap_style = 'Key'.
  CALL METHOD document->new_line.
ENDFORM.                    "HTML_TOP_OF_PAGE