Java：HTTP post多维数组

I try to find a way to post a multidimensional array in java but I didn't found any information about this (without JSON). I already have the serveur side code that handle the request in pure php:

$_POST['login'] = '-------';
$_POST['date'] = '8h29%;8h49';
$_POST['command'][0]['quantity'] = 1;
$_POST['command'][1]['quantity'] = 11;
$_POST['command'][0]['id_product'] = 2;
$_POST['command'][1]['id_product'] = 20;

So, have you an idea to solve my problem ?

thanks :).