Jsf 计算插入值时的值

我想创建非常简单的JSF网页，用于价格计算：

<h:form>
    <h:outputText value="Number of Computers"/>

    <h:panelGroup layout="block" id="desktopClients_select" style="padding-top: 3px;" styleClass="text">
        <h:inputText id="desktopClients" value="#{pricingCalculator.computers}">
            <f:ajax event="change" render="@form" listener="#{pricingCalculator.calculateTotalPrice}"/>
        </h:inputText>
    </h:panelGroup>

    <h:outputText value="Email support incidents"/>

    <h:panelGroup layout="block" id="email_support_incidents" style="padding-top: 3px;" styleClass="text">
        <h:inputText id="email_support_incidents_text" value="#{pricingCalculator.emailSupportIncidents}">
            <f:ajax event="change" render="@form" listener="#{pricingCalculator.calculateTotalPrice}"/>
        </h:inputText>
    </h:panelGroup>

    <h:outputText value="Phone support incidents"/>

    <h:panelGroup layout="block" id="phone_support_incidents" style="padding-top: 3px;" styleClass="text">
        <h:inputText id="phone_support_incidents_text" value="#{pricingCalculator.phoneSupportIncidents}">
            <f:validateLongRange minimum="1" maximum="150" />
            <f:ajax event="change" render="@form" listener="#{pricingCalculator.calculateTotalPrice}"/>
        </h:inputText>
    </h:panelGroup>

    <h:outputText value="Total price"/>

    <h:panelGroup layout="block" id="total_price" style="padding-top: 3px;" styleClass="text">
        <h:outputText value="#{pricingCalculator.calculateTotalPrice}"/>
    </h:panelGroup>

    </h:panelGrid>

</h:form>

当我在输入字段中插入一些值时，我想重新计算总价。我现在有两个问题：我得到异常

serverError:class javax.el.MethodNotFoundException/pricing_calculator.xhtml@115136 listener=“#{pricingCalculator.calculateTotalPrice}”：找不到方法：com.web.common。PricingCalculator@22939533.calculateTotalPrice（javax.faces.event.AjaxBehaviorEvent）

---

当我插入新值时，前一个值设置为零。它没有被正确地记住。

@BalusC已经给了您答案，但更明确地说，这里引用了Oracle的Java EE 6教程（您应该阅读）中有关方法表达式的一段话：

方法表达式只能在标记属性中使用，也只能在 以下方法：

• 对于单个表达式构造，其中bean指的是JavaBeans组件，方法指的是JavaBeans的方法 组成部分：

[……]

也就是说，将

getCalculateTotalPrice

重命名为

calculateTotalPrice

编辑：以下方法调用的预期签名之间也存在不一致：

---

• 您到底不明白异常的哪一部分？它说它希望在提到的消息方法中找到，但您确实没有这样的方法。请检查
  。OP基本上用getter方法在1中犯了2个错误。
  @Named
  @ViewScoped
  public class PricingCalculator implements Serializable
  {
      private int computers;
      private float emailSupportIncidents;
      private float phoneSupportIncidents;
  
      private float totalPrice;
  
      // Prices for each component and service    
      private final float computers_price = 299;
      private final float emailSupportIncidents_price = 300;
      private final float phoneSupportIncidents_price = 150;
  
      public String getCalculateTotalPrice()
      {
          totalPrice = (computers_price * computers)
              + (emailSupportIncidents_price * emailSupportIncidents)
              + (phoneSupportIncidents_price * phoneSupportIncidents);
  
          String result = Float.toString(totalPrice);
          return result;
      }
  
      public int getComputers()
      {
          return computers;
      }
  
      public void setComputers(int computers)
      {
          this.computers = computers;
      }
  
      public float getEmailSupportIncidents()
      {
          return emailSupportIncidents;
      }
  
      public void setEmailSupportIncidents(float emailSupportIncidents)
      {
          this.emailSupportIncidents = emailSupportIncidents;
      }
  
      public float getPhoneSupportIncidents()
      {
          return phoneSupportIncidents;
      }
  
      public void setPhoneSupportIncidents(float phoneSupportIncidents)
      {
          this.phoneSupportIncidents = phoneSupportIncidents;
      }
  
      public float getTotalPrice()
      {
          return totalPrice;
      }
  
      public void setTotalPrice(float totalPrice)
      {
          this.totalPrice = totalPrice;
      }
  }