求教在继承了modelDrivend的action中如何接收前台传来的非bean数据，如json数组

@Controller
@Scope("prototype")
public class PatientsAction extends BaseAction implements ModelDriven{
private static final long serialVersionUID = 1L;
private Patient patient = new Patient();

求教在这个action中如何接收前台用getJSON传来的数据

http://692088846.iteye.com/blog/2001715