Writing in XML with JSP (Migration from PHP)

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XML

PHP

JSP

Guys I have a big XML where I save data this way:

<tabuleiro>
    <linha> <!-- Linha inicial -->
        <coluna1>3</coluna1>
        <coluna2>3</coluna2>
        <coluna3>3</coluna3>
.
....etc

I receive two variables (from XMLHttpRequest)

String str = request.getParameter("local");
String str2 = request.getParameter("cor");

And I need to update the file many times. I did that using php this way:

$sxe = new SimpleXMLElement('tabuleiro.xml', NULL, TRUE);
    $linha=$sxe->linha;


if($local == 1)
    $linha[0]-> coluna1 =$cor;
    else if($local == 2)
    $linha[0]-> coluna2 =$cor;
.................

The problem is I have no idea how to place those values where I want (in the xml file) with JSP... Anybody can give me an hint?