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
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.
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。