@echo off
for /f %%a in ('dir /s /b /a-d "J:\NDM\"') do (
    for /f %%b in ('findstr "%%~nxa" a.txt') do (
    ren "%%a" "%%b.pdf"
    )
)
pause
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<# :
cls&echo off&cd /d "%~dp0"&mode con lines=5000
powershell -NoProfile -ExecutionPolicy bypass "Get-Content -literal \"%~f0\"|out-string|Invoke-Expression"
pause
exit
#>
$txtfile=".\a.txt";
$folder="J:\NDM";
if(-not (test-path -literal $txtfile)){write-host ('"'+$txtfile+'" not found');exit;}
if(-not (test-path -literal $folder)){write-host ('"'+$folder+'" not found');exit;}
$text=[IO.File]::ReadAllLines($txtfile, [Text.Encoding]::GetEncoding('GB2312'));
$files=@(dir -literal $folder -recurse|?{($_.Name -match '^\d+\.pdf$') -and ($_ -is [System.IO.FileInfo])});
for($i=0;$i -lt $files.length;$i++){
    for($j=0;$j -lt $text.count;$j++){
        if($text[$j].Contains($files[$i].BaseName)){
            if($text[$j] -ne $files[$i].BaseName){
                $newname=($text[$j] -replace '[\t\\\/:\*\?"<>\|]','')+$files[$i].Extension;
                $newfile=$files[$i].Directory.FullName+'\'+$newname;
                write-host ($files[$i].FullName+' --> '+$newname);
                move-item -literal $files[$i].FullName $newfile -force -ErrorAction SilentlyContinue;
                break;
            }
        }
    }
}
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