<f:view>
   <h:form>
      <h:inputText id="number1" value="#{calcBean.number1}"/>+
      <h:inputText id="number2" value="#{calcBean.number2}"/>
      <h:commandButton id="submit" action="#{calcBean.calc}" value="加算" />
   </h:form>
   <h:messages />
</f:view>