如何复制目录结构但只包含某些文件(使用Windows批处理文件)

@echo off
setlocal
set source_dir=%1
set target_dir=%2

if not defined source_dir (
    echo Please specify the source directory.
    exit /b 1
)

if not defined target_dir (
    echo Please specify the target directory.
    exit /b 1
)

if not exist "%source_dir%" (
    echo Source directory "%source_dir%" does not exist.
    exit /b 1
)

if not exist "%target_dir%" (
    echo Target directory "%target_dir%" does not exist.
    exit /b 1
)

for /r "%source_dir%" %%f in (*.txt) do (
    set source_file=%%f
    set target_file=%target_dir%\%%~nf%%~xf
    copy "!source_file!" "!target_file!"
)

echo Done.

copy_txt_files.bat "C:\source_dir" "C:\target_dir"