利用反射来获取继承的类的类型

public abstract class BaseAction<T> extends ActionSupport implements
        ModelDriven<T>, Preparable {
    protected T model ;
    private static final long serialVersionUID = -1132381027435158666L;
    private Class<T> clazz ;
    
    public BaseAction(){
        ParameterizedType type = (ParameterizedType) this.getClass().getGenericSuperclass() ;
        clazz = (Class<T>) type.getActualTypeArguments()[0] ;
        try {
            model = clazz.newInstance() ;
        } catch (InstantiationException | IllegalAccessException e) {
            e.printStackTrace();
        }
    }

    public void prepare() throws Exception {

    }

    public T getModel(){
        return model ;
    }

}