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var myURL = Liferay.PortletURL.createResourceURL();
myURL.setResourceId('handler-id');
myURL.setPortletId('myportlet_WAR_myportlet');

var myBean = {};
// namespace is necessary if <requires-namespaced-parameters>true</requires-namespaced-parameters>
myBean['_myportlet_WAR_myportlet_ragioneSociale'] = $('#myportlet_WAR_myportlet_ragioneSociale').val();
myBean['_myportlet_WAR_myportlet_email'] = $('#myportlet_WAR_myportlet_email').val();
myBean['_myportlet_WAR_myportlet_telefono'] = $('#myportlet_WAR_myportlet_telefono').val();

$.ajax({
    type: 'POST',
    dataType: 'json',
    url: myURL.toString(),
    data: myBean,
    success: function (data, status, xhr) {
        console.log('ok');
    },
    error: function () {
        console.log('ko');
    }
});

@ResourceMapping("handler-id")
public void resourceHandler(ResourceRequest request, 
  ResourceResponse response, @ModelAttribute MyBean Mybean) {
}