直接上代码：
java
REPORT zcycle055.
DATA: lt_tab TYPE TABLE OF zpps001.
DATA: ls_tab TYPE zpps001.
ls_tab-werks = '1001'.
ls_tab-gamng = '150.00'.
ls_tab-gstrp = '20201202'.
ls_tab-aufnr = '000010000246'.
ls_tab-auart = '标准生产'.
ls_tab-gltrp = '20201205'.
ls_tab-matnr = '04-r02a000-00005'.
ls_tab-maktx = 'Cycle is handsome!'.
ls_tab-ernam = 'lf002'.
ls_tab-erdat = '20201202'.
ls_tab-zcwb = 'MO20120003'.
ls_tab-zdddw = '盒'.
ls_tab-ftrmi = '20201210'.
ls_tab-zzczgsmc = 'Cycle有限责任公司'.
APPEND ls_tab TO lt_tab.
CLEAR ls_tab.
PERFORM export_pdf.
FORM export_pdf.
DATA:zsmart_name TYPE rs38l_fnam.
CALL FUNCTION 'SSF_FUNCTION_MODULE_NAME'
EXPORTING
formname = 'ZPP001'
IMPORTING
fm_name = zsmart_name
EXCEPTIONS
no_form = 1
no_function_module = 2
OTHERS = 3.
DATA: w_ctrlop TYPE ssfctrlop, "Smart Forms: 控制结构 "W_CONTROL
w_compop TYPE ssfcompop, "SAP Smart Forms: 智能写作器 (传输) 选项"W_OUTPUT.
w_return TYPE ssfcrescl. "Smart Forms: 表格打印结束时返回值
DATA: len TYPE i,
w_filesize TYPE i,
g_pdf_xstring TYPE xstring,
l_lines TYPE TABLE OF tline WITH HEADER LINE.
DATA doctab TYPE TABLE OF docs WITH HEADER LINE.
DATA itab LIKE tline OCCURS 0 WITH HEADER LINE.
DATA: file_name TYPE string,
fullpath TYPE string,
path TYPE string,
p_sefile LIKE rlgrap-filename VALUE 'D:\'. "'/usr/sap/tmp/'.
w_ctrlop-getotf = 'X'."OTF 表的返回
w_ctrlop-no_dialog = 'X'."关闭打印对话框
"w_ctrlop-no_open = 'X'."no dialog box
"w_ctrlop-no_close = 'X'."no
*&W_COMPOP-TDNOPRINT = 'X'.
w_compop-tdnoprev = 'X'."没有打印预览
"W_COMPOP用来设置打印参数弹出对话框中的值，下面这几个参数不必要
* W_COMPOP-TDNEWID = 'X'. "New Spool
w_compop-tdimmed = 'X'.
w_compop-tddelete = ''. "Delete Spool After Print
w_compop-tdfinal = 'X'.
w_compop-tdiexit = 'X'. "Exit after printing in print preview
w_compop-tddest = 'lp01'. "设备名称
w_compop-xdf2outdev = 'lp01'.
w_compop-tdarmod = '1'.
w_compop-tdnoprev = 'X'. "隐藏报表预览功能，默认为空
*&smartforms打印 ,将打印的值输入到W_RETURN-OTFDATA[]中
CALL FUNCTION zsmart_name
EXPORTING
control_parameters = w_ctrlop
output_options = w_compop
* totalpages = totalpages
* zbukrs = p_bukrs
* zcb = cb
"gth_header = gth_alv_sel
IMPORTING
job_output_info = w_return
TABLES
t_item = lt_tab "传所选行项目明细内表 传到sf
EXCEPTIONS
formatting_error = 1
internal_error = 2
send_error = 3
user_canceled = 4
OTHERS = 5.
"CONVERT_OTF函数取不到lines的返回值
"但是可以直接获取到PDF数据的XSTRING数据，可以用于后台直接OPEN DATASET 生成文件
CALL FUNCTION 'CONVERT_OTF'
EXPORTING
format = 'PDF'
IMPORTING
bin_filesize = len
bin_file = g_pdf_xstring
TABLES
otf = w_return-otfdata[]
lines = itab
EXCEPTIONS
err_max_linewidth = 1
err_format = 2
err_conv_not_possible = 3
err_bad_otf = 4
OTHERS = 5.
"后台OPEN DATASET 直接生成PDF文件
CONCATENATE p_sefile sy-uname '-' sy-uzeit '.pdf' INTO file_name. "addrss
OPEN DATASET file_name FOR OUTPUT IN BINARY MODE." MESSAGE L_MESSAGE_DB.
IF sy-subrc EQ 0.
TRANSFER g_pdf_xstring TO file_name.
CLOSE DATASET file_name.
ELSE.
MESSAGE 'OPEN ERROR！！' TYPE 'E'.
STOP.
ENDIF.
"CONVERT_OTF_2_PDF 可以生成PDF格式的内表
CALL FUNCTION 'CONVERT_OTF_2_PDF' "转换otf数据为二进制PDF文件,可以用于前台直接下载PDF文件
* EXPORTING
* use_otf_mc_cmd = 'X'
* archive_index = archive_index
IMPORTING
bin_filesize = len
TABLES
otf = w_return-otfdata[]
doctab_archive = doctab
lines = l_lines[]
EXCEPTIONS
err_conv_not_possible = 1
err_otf_mc_noendmarker = 2.
IF sy-subrc <> 0.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ENDIF.
"前台下载PDF文件
CONCATENATE 'D:\' sy-uname '-' sy-uzeit ' FFF.pdf' INTO file_name.
"定义文件名
"这一段不屏蔽， 在打印的时候会有显示选择路径的对话框，屏蔽则直接保存在上面的文件名
"file_name 指定的路径
CALL METHOD cl_gui_frontend_services=>file_save_dialog "保存文件窗口（选择路径）
EXPORTING
default_extension = 'PDF'
file_filter = '*.PDF'
default_file_name = file_name
CHANGING
filename = file_name
path = path
fullpath = fullpath
* user_action = ua
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.
CALL FUNCTION 'GUI_DOWNLOAD' "保存文件在本地
EXPORTING
bin_filesize = len
filename = file_name
filetype = 'BIN'
IMPORTING
filelength = w_filesize
TABLES
data_tab = l_lines[]
EXCEPTIONS
file_write_error = 1
no_batch = 2
gui_refuse_filetransfer = 3
invalid_type = 4
no_authority = 5
unknown_error = 6
header_not_allowed = 7
separator_not_allowed = 8
filesize_not_allowed = 9
header_too_long = 10
dp_error_create = 11
dp_error_send = 12
dp_error_write = 13
unknown_dp_error = 14
access_denied = 15
dp_out_of_memory = 16
disk_full = 17
dp_timeout = 18
file_not_found = 19
dataprovider_exception = 20
control_flush_error = 21
OTHERS = 22.
IF sy-subrc <> 0.
MESSAGE 'File not downloaded' TYPE 'I' .
ENDIF.
ENDIF.
ENDFORM. "export_pdf效果：
直接把文件下载到桌面
打开文件
更多细节可以参考大佬的文章：https://www.cnblogs.com/buduzhiren/p/10754617.html