在SAP系统中，通过SE11显示一个table的内容，可以发现ALV grid的显示界面上有个spread sheet的标准按钮，点击这个按钮可以将显示的内容下载成excel文件，其中也包括扩展名.xlsx的文件。
这个功能很方便，因为下载的结果和ALV中看到的是一样的。
debug研究了一下标准代码，发现是将需要下载的内表先转换成XML stream，然后再通过gui_download的BIN模式将xml stream下载成.xlsx文件。
写了一个简单的程序供大家参考
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REPORT ztest_alv_download.
DATA:git_vbap TYPE STANDARD TABLE OF vbap.
DATA:git_fcat TYPE lvc_t_fcat,
gwa_layout TYPE lvc_s_layo.
DATA: l_path TYPE string,
l_filename TYPE string.
START-OF-SELECTION.
SELECT *
INTO TABLE git_vbap
FROM vbap
UP TO 100 ROWS.
CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
EXPORTING
i_structure_name = 'VBAP'
CHANGING
ct_fieldcat = git_fcat "生成下载excel文件的头--reptext字段
EXCEPTIONS
inconsistent_interface = 1
program_error = 2
OTHERS = 3.
gwa_layout-zebra = 'X'.
gwa_layout-sel_mode = 'A'.
gwa_layout-cwidth_opt = 'X'.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY_LVC'
EXPORTING
i_callback_program = sy-repid
i_callback_pf_status_set = 'FRM_STATUS_SET'
i_callback_user_command = 'FRM_USER_COMMAND'
is_layout_lvc = gwa_layout
it_fieldcat_lvc = git_fcat
TABLES
t_outtab = git_vbap[]
EXCEPTIONS
program_error = 1
OTHERS = 2.
IF sy-subrc <> 0.
* Implement suitable error handling here
ENDIF.
FORM frm_status_set USING rt_extab TYPE slis_t_extab.
SET PF-STATUS 'S0001'.
ENDFORM. "frm_status_set
FORM frm_user_command USING r_ucomm TYPE sy-ucomm
rs_selfield TYPE slis_selfield.
* Local Variable Declare
DATA: l_filename TYPE string.
IF r_ucomm = 'DOWN'.
* get file name
PERFORM frm_get_directory CHANGING l_filename.
* download
PERFORM export_to_excel USING l_filename.
ENDIF.
ENDFORM.
FORM frm_get_directory CHANGING c_filename TYPE string.
DATA : l_title TYPE string,
l_filename TYPE string, "file name
l_path TYPE string VALUE 'C:\TEMP', "path
l_fullpath TYPE string, "full path
l_result TYPE i. "result return
l_title = 'Save as...'.
CALL METHOD cl_gui_frontend_services=>file_save_dialog
EXPORTING
window_title = l_title
default_extension = 'XLSX'
default_file_name = 'Download.XLSX'
* with_encoding =
* file_filter =
initial_directory = l_path
prompt_on_overwrite = 'X'
CHANGING
filename = l_filename
path = l_path
fullpath = l_fullpath
user_action = l_result
* file_encoding =
EXCEPTIONS
cntl_error = 1
error_no_gui = 2
not_supported_by_gui = 3
OTHERS = 4.
IF sy-subrc <> 0.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ELSE.
c_filename = l_filename. "l_path.
ENDIF.
ENDFORM.
*&---------------------------------------------------------------------*
*& Form EXPORT_TO_EXCEL
*&---------------------------------------------------------------------*
* text
*----------------------------------------------------------------------*
* -->P_L_FILENAME text
*----------------------------------------------------------------------*
FORM export_to_excel USING i_filename.
DATA: l_length TYPE i,
l_xml_stream TYPE xml_rawdata,
l_flavour TYPE string,
l_version TYPE string.
DATA: lr_alv_new_data TYPE REF TO data,
lr_result_data TYPE REF TO cl_salv_ex_result_data_table.
DATA: ls_xml_choice TYPE if_salv_bs_xml=>s_type_xml_choice,
xml TYPE xstring.
GET REFERENCE OF git_vbap INTO lr_alv_new_data.
lr_result_data = cl_salv_ex_util=>factory_result_data_table(
* t_selected_rows = lt_lvc_row
* t_selected_columns = lt_sel_cols
* t_selected_cells = lt_sel_cells
r_data = lr_alv_new_data
* s_layout = lr_grid->m_cl_variant->ms_layout
t_fieldcatalog = git_fcat
* t_sort = lr_grid->m_cl_variant->mt_sort
* t_filter = lr_grid->m_cl_variant->mt_filter
* t_hyperlinks = lr_grid->mt_hyperlinks
* s_current_cell = ls_cur_cell
* hyperlink_entry_column = ls_hyper_entry
* dropdown_entry_column = ls_dropdown_entry
* r_top_of_list = lr_top_of_list
* r_end_of_list = lr_end_of_list
* t_dropdown_values = lt_drdn
).
CASE cl_salv_bs_a_xml_base=>get_version( ).
WHEN if_salv_bs_xml=>version_25.
l_version = if_salv_bs_xml=>version_25.
WHEN if_salv_bs_xml=>version_26.
l_version = if_salv_bs_xml=>version_26. " = 2.6
ENDCASE.
l_flavour = if_salv_bs_c_tt=>c_tt_xml_flavour_export. "Flavor for Complete ALV XML
CALL METHOD cl_salv_bs_tt_util=>if_salv_bs_tt_util~transform
EXPORTING
xml_type = if_salv_bs_xml=>c_type_xlsx "XLSX
xml_version = l_version
r_result_data = lr_result_data
xml_flavour = l_flavour
gui_type = if_salv_bs_xml=>c_gui_type_gui "Y6DK066330
IMPORTING
xml = xml.
IF NOT i_filename IS INITIAL.
CALL FUNCTION 'SCMS_XSTRING_TO_BINARY'
EXPORTING
buffer = xml
IMPORTING
output_length = l_length
TABLES
binary_tab = l_xml_stream.
CALL METHOD cl_gui_frontend_services=>gui_download
EXPORTING
bin_filesize = l_length
filetype = 'BIN'
filename = i_filename
CHANGING
data_tab = l_xml_stream
EXCEPTIONS
OTHERS = 1.
IF sy-subrc <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
* WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
ENDIF.
ENDFORM.
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在status上加了两个按钮，一个是标准的spreadsheet按钮(&XXL)，一个是自定义的按钮(DOWN)，供下载结果对比使用。
代码简单说明：
1） cl_salv_bs_tt_util=>if_salv_bs_tt_util~transform是用来指定下载的excel格式的，也就是模拟了标准按钮的那个format选择步骤，这个类方法中用到了接口if_salv_bs_xml中的一些属性，10就标识是下载成.xlsx格式的文件。
2) SCMS_XSTRING_TO_BINARY可以将Xtring转化成二进制格式并保存到内表中
以上。