Recieve data sent from php with java

I have my server running and there is this index.php file on it. i use this in php to send a file from my server

<?php
$filename = "Small.gif";

if(file_exists($filename)){

//Get file type and set it as Content Type
$finfo = finfo_open(FILEINFO_MIME_TYPE);
header('Content-Type: ' . finfo_file($finfo, $filename));
finfo_close($finfo);

//Use Content-Disposition: attachment to specify the filename
header('Content-Disposition: attachment; filename='.basename($filename));

//No cache
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');

//Define file size
header('Content-Length: ' . filesize($filename));

ob_clean();
flush();
readfile($filename);
exit;
}

?>

so when i open it with a browser it starts downloading the file.

now i'm using a browser to download it.my question is that how could i recieve this file by a java code and save it on my disk.THANKS