Struts and Twitter Bootstrap signup form - html

Question

I'm developing a web application with Struts2 and Twitter Bootstrap.
I've created a simple registration form that uses HTML tags and bootstrap attributes, while the form of Struts uses Struts tags.
Is there a way to integrate them? Below are the two code snippets:
Using HTML and Twitter Bootstrap:
<div class="row">
<div class="col-md-6">
<form class="form-horizontal" action="" method="POST">
<fieldset>
<div class="control-group">
<label class="control-label" for="username">Username</label>
<div class="controls">
<input type="text" id="username" name="username" placeholder="" class="form-control input-lg">
<p class="help-block">Username may contain any letters or numbers, no spaces</p>
</div>
</div>
<div class="control-group">
<label class="control-label" for="password">Password</label>
<div class="controls">
<input type="password" id="password" name="password" placeholder="" class="form-control input-lg">
<p class="help-block">Password must be at least 6 characters</p>
</div>
</div>
<div class="control-group">
<label class="control-label" for="password_confirm">Password (Conferma)</label>
<div class="controls">
<input type="password" id="password_confirm" name="password_confirm" placeholder="" class="form-control input-lg">
<p class="help-block">Confirm password</p>
</div>
</div>
<div class="control-group">
<label class="control-label" for="email">E-mail</label>
<div class="controls">
<input type="email" id="email" name="email" placeholder="" class="form-control input-lg">
<p class="help-block">Insert your email</p>
</div>
</div>
<div class="control-group">
<!-- Button -->
<div class="controls">
<button class="btn btn-success">Confirm</button>
</div>
</div>
</fieldset>
</form>
</div>
</div>
Form in Struts:
<s:actionerror/>
<s:form action="Registrazione" method="POST" id="formRegistrazione">
<p align="center">Inserisci i tuoi dati per registrarti al sistema: </p>
<s:textfield name="user.username" label="Username" />
<s:password name="user.password" label="Password" />
<s:password name="user.confermaPassword" label="Confirm Password" />
<s:textfield name="user.email" label="Email"/>
<s:submit value="Registrazione" align="center" />
</s:form>