<%= start_form_tag :action => 'add' %>
   <%= text_field_tag :number1, @number1 %>＋
   <%= text_field_tag :number2, @number2 %>
   <%= submit_tag 'Add' %>
<%= end_form_tag %>


<h:inputText id="number1" value="#{calcBean.number1}" />

public class CalcBean implements Serializable {
   private int number1;
   private int number2;
   private int answer;

   public int getAnswer() {
      return answer;
   }
   public void setAnswer(int answer) {
      this.answer = answer;
   }
   public int getNumber1() {
      return number1;
   }
   public void setNumber1(int number1) {
      this.number1 = number1;
   }
（中略）
}