一、文件上傳
本地的文本文件或者Excel文件上傳到服務器內表中，數據自動轉換，文件數據列之間默認通過table鍵分隔，也可以自己指定。
核心函數：TEXT_CONVERT_XLS_TO_SAP
上傳示例代碼：
TYPE-POOLS:truxs.
PARAMETERS:p_file LIKE rlgrap-filename OBLIGATORY MEMORY ID a1. "MEMORY ID 表示當用戶再次進入該輸入框時，上次輸入的文件名還在
DATA: it_raw TYPE truxs_t_text_data.
DATA:l_obj TYPE REF TO cl_gui_frontend_services.
DATA: it_file TYPE filetable WITH HEADER LINE.
DATA: g_rc TYPE i.
DATA: BEGIN OF lt_data OCCURS 0,
c(2) TYPE c,
n(2) TYPE n,
i TYPE i,
d TYPE d,
END OFlt_data.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_file. "彈出選擇文件對話框
CREATE OBJECT l_obj.
CALL METHOD l_obj->file_open_dialog
EXPORTING
file_filter = '*.xls;*.xlsx;*.txt'
initial_directory = 'C:\data'
CHANGING
file_table = it_file[]
rc = g_rc.
READ TABLE it_file INDEX 1.
p_file = it_file-filename.
START-OF-SELECTION.
CALL FUNCTION 'TEXT_CONVERT_XLS_TO_SAP' "可以是Excel文件，也可以是Txt文件
EXPORTING
* I_FIELD_SEPERATOR = 分隔符，默認爲Tab
i_line_header = 'X'
i_tab_raw_data = it_raw "該參數實際上沒有使用到，但爲必輸參數
i_filename = p_file
TABLES
i_tab_converted_data = lt_data. "會自動的將Excel、Txt文件中的數據一行行讀取到數據內表中
EXCEPTIONS
conversion_failed = 1
OTHERS = 2.
IF sy-subrc <> 0.
MESSAGE '文件上傳失敗!' TYPE 'E'.
ENDIF.
二、文件下載
下面有兩個函數可以把ABAP內表中的數據下載到本地Excel文件中，分別是
SAP_CONVERT_TO_XLS_FORMAT和GUI_DOWNLOAD。
１、SAP_CONVERT_TO_XLS_FORMAT函數
DATA: lt_lines TYPE TABLE OF YLY_TESTTABLE1.
SELECT * FROM YLY_TESTTABLE1 INTO lt_lines.
CALL FUNCTION 'SAP_CONVERT_TO_XLS_FORMAT'
EXPORTING
i_filename = 'd:\1.xlsx' "下載至除C盤以外的盤，以免發生意想不到的錯誤
TABLES
i_tab_sap_data = lt_lines
EXCEPTIONS
CONVERSION_FAILED = 1
OTHERS = 2.
IF SY-SUBRC <> 0.
write:'failed'.
ELSE.
write:'OK'.
ENDIF.
注：如果下載的1.xlsx文件已經存在，那麼數據將會覆蓋原數據。但是如果新數據的行數比原數據的行數少，那麼它在原數據中只覆蓋掉 新數據行數 那麼多的數據；
2、GUI_DOWNLOAD函數
DATA: lt_lines TYPE TABLE OF YLY_TESTTABLE1.
SELECT * FROM YLY_TESTTABLE1 INTO TABLE lt_lines.
CALL FUNCTION 'GUI_DOWNLOAD'
EXPORTING
filename = 'D:\gui_download.XLS' "下載至除C盤以外的盤，以免發生意想不到的錯誤
filetype = 'DAT'
codepage = '4103'
replacement = '#'
write_field_separator = 'X'
write_bom = 'X'
TABLES
data_tab = lt_lines.
注：如果gui_download.XLS文件已經存在，它不像SAP_CONVERT_TO_XLS_FORMAT函數一樣，它會完全覆蓋原數據，而不管原數據行數是否與新數據行數相等。
相關的參數英文解釋如下：
1. FILETYPE
‘ASC’ :
ASCII format. The table is transferred as text. Conversion exits are performed. The output format additionally depends on the parameters CODEPAGE, TRUNC_TRAILING_BLANKS, and TRUNC_TRAILING_BLANKS_EOL.
‘IBM’ :
ASCII format with IBM codepage conversion (DOS). This format corresponds to the ‘ASC’ format when using target codepage 1103. This codepage is frequently used for data exchange via floppy disk.
‘DAT’ :
Column-by-column transfer. With this format, the data is transferred as text as with ASC. However, no conversion exits are performed and the columns are separated by tab characters. This format generates files than can be uploaded again using gui_upload or ws_upload.
‘DBF’ :
Data is downloaded in dBase format. Since in this format the data types of the individual columns are stored as well, you can often avoid import problems, for example, into Microsoft Excel, especially when interpreting numeric values.
‘WK1’ :
Data is downloaded in Lotus 1-2-3 format.
‘BIN’ :
Binary format. Data is transferred binarily. There is no formatting and no codepage conversion. The data is interpreted row by row; it is not formatted by columns. Specify the data length in parameter BIN_FILESIZE. The table should consist of a column of type X, because especially in Unicode systems, the conversion of structured into binary data causes errors.
Default
‘ASC’
2. APPEND
GUI_DOWNLOAD APPEND
By default, existing local files are overwritten by new versions. By setting APPEND to ‘X’, the downloaded data is appended to an existing file. If the file does not yet exist, it is created.
Value range
‘X’ = Data is appended.
SPACE = Data is overwritten if the file already exists.
Default
SPACE
3. WRITE_FIELD_SEPARATOR
GUI_DOWNLOAD WRITE_FIELD_SEPARATOR
In the downloaded file, the columns are separated by tab characters (cl_abap_char_utilities=>horizontal_tab). You should use this setting if you want to upload the data from the file at a later time, because this is the only way of identifying individual columns.
The parameter makes sense only for the FILETYPE values ASC, DAT and IBM; for DAT it is set implicitly.
Value range
‘X’ : Write separator.
SPACE : Do not write separator.
Default
SPACE
4. WRITE_LF
GUI_DOWNLOAD WRITE_LF
If this parameter is set, at the end of each row a row separator is inserted by CL_ABAP_CHAR_UTILITIES=>CR_LF. This parameter makes sense only for FILETYPE ‘ASC’, ‘DAT’ and ‘IBM’. If this parameter is not set, blanks at the end of a row are not removed.
Value range
‘X’: Row separator is inserted.
SPACE: Row separator is not inserted.
Default
‘X’
5. DAT_MODE
GUI_DOWNLOAD DAT_MODE
If parameter DAT_MODE is set, the file is stored in ‘DAT’ format. No conversion exits are performed. Number and date fields are stored in a standard format which makes it possible, to later import the file using gui_upload.
Value range
‘X’: DAT_MODE is switched on.
SPACE: DAT_MODE is not switched on.
Default
SPACE
6. CODEPAGE
GUI_DOWNLOAD CODEPAGE
Use parameter CODEPAGE to specify the desired target codepage. If this parameter is not set, the codepage of the SAP GUI is used as the target codepage.
Value range
4-digit number of the SAP codepage. The function module SCP_CODEPAGE_BY_EXTERNAL_NAME returns the SAP codepage number for an external character set name, for example, “iso-8859-1”. The function module NLS_GET_FRONTEND_CP returns the appropriate non-Unicode frontend codepage for a language.
You can determine the desired codepage interactively, if the parameter with_encoding of method file_save_dialog is set by cl_gui_frontend_services.
SPACE: Codepage of the SAP GUI
Default
SPACE
7. REPLACEMENT
GUI_DOWNLOAD REPLACEMENT
Specifies the replacement character to be used when during a character set conversion a character cannot be converted.
Value range
An individual character.
Default
‘#’
8. WRITE_BOM
GUI_DOWNLOAD WRITE_BOM
If the data is written in a Unicode codepage, at the beginning of the file the respective byte order mark (BOM) is inserted.
Unicode - Little Endian Codepage 4103, binary values ‘FFFE’
Unicode - Big Endian Codepage 4102, binary values ‘FEFF’
UTF-8 Codepage 4110, binary values ‘EFBBBF’
Note: Microsoft Excel only supports Unicode data if they have been written in the format Unicode - Little Endian.
Value range
‘X’: Write BOM.
SPACE: Do not write BOM.
Default
SPACE
9. FIELDNAMES
GUI_DOWNLOAD FIELDNAMES
Optional table with column names for the individual columns.
‘DBF’: The column names are entered into the structure definition of the DBF file.
‘DAT’: An additional row with the column names is inserted at the beginning of the table.