https://www.cnblogs.com/jinyin/p/10850565.html
cl_abap_char_utilities=>horizontal_tab TAB符
cl_abap_char_utilities=>cr_lf 回车换行
cl_abap_char_utilities=>vertical_tab 垂直制表符
cl_abap_char_utilities=>newline 换行
cl_abap_char_utilities=>form_feed 换页
cl_abap_char_utilities=>backspace 退格符
cl_abap_char_utilities=>byte_order_mark_utf8 utf8文件