Can anyone help me with converting the following php code to jsp. Thanks.

<?php

define('STORE', 'ratings.dat');

function put_contents($file,$content) {
$f = fopen($file,"w");
fwrite($f,$content);
fclose($f);
}

if(isset($_REQUEST["rating"])) {
$rating = $_REQUEST["rating"];
$storedRatings = unserialize(file_get_contents(STORE));
$storedRatings[] = $rating;
put_contents(STORE, serialize($storedRatings));
$average = round(array_sum($storedRatings) / count($storedRatings), 2);
$count = count($storedRatings);
$xml = "<ratings><average>$average</average><count>$count</count></ratings>";
header('Content-type: text/xml');
echo $xml;
}

?>