How to get the request parameters in Symfony 2?

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I am very new to symfony. In other languages like java and others I can use request.getParameter('parmeter name') to get the value.

Is there anything similar that we can do with symfony2.
I have seen some examples but none is working for me. Suppose I have a form field with the name username. In the form action I tried to use something like this:

$request = $this->getRequest();
$username= $request->request->get('username');

I have also tried

$username = $request->getParameter('username');

and

$username=$request->request->getParameter('username');

But none of the options is working.However following worked fine:

foreach($request->request->all() as $req){
    print_r($req['username']);
}

Where am I doing wrong in using getParameter() method. Any help will be appreciated.

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