在 JSF 中提交按钮后，xhtml 不返回任何内容

Question

我有简单的 BMIclass 并尝试使用 JSF 接收输入并显示 BMI class 的结果。但是点击提交按钮后，我的 xhtml 页面没有 return 任何内容。我的体重指数 class：

   public class BMI {
   private static int weight;
   private static int height;
   private static double bmi;
   private  static String bmiCategory;

public static int getWeight() {
    return weight;
}
public void setWeight(int weight) {
    this.weight = weight;
}
public static int getHeight() {
    return height;
}
public void setHeight(int height) {
    this.height = height;
}



public BMI(int weight, int height) {
    super();
    this.weight = weight;
    this.height = height;
    bmi();
    bmiCategory();
}
public BMI() {
    super();
    // TODO Auto-generated constructor stub
}

public  double bmi () {

    double bmi;
    bmi = (double)(703 * weight) / (height * height );  
    return bmi;
}

public  String bmiCategory () {

    if (bmi() < 18.5) {
        bmiCategory = "Under weight";
    } else if (bmi() <= 24.9) {
        bmiCategory = "Normal";
    } else if (bmi() <= 29.9) {
        bmiCategory = "Over weight";
    } else {
        bmiCategory = "Obese";
    }
    return bmiCategory;
}

}

XHTML 文件：

    <h:body>
<h:form>
<p:panel id="panel" header="BMI Calculator" style="margin-bottom:10px;">
    <p:messages id="messages" showDetail="true" autoUpdate="true" closable="true" />
    <h:panelGrid columns="2" cellpadding="5">
        <h:outputLabel for="weight" value="Weight(in lbs):" />
        <p:inputText id = "weight" value="#{bmiController.bmiBean.weight}" required="true" />

        <h:outputLabel for="height" value="Height(in inches):" />
        <p:inputText id = "height" value="#{bmiController.bmiBean.height}" required="true" />required="true" />


    </h:panelGrid>
</p:panel>

   <p:commandButton value="Calculator" update="panel" actionListener="#{bmiController.calculate}"/>

控制器Class:

  import javax.faces.application.FacesMessage;



 @Named
 @ViewScoped

  public class BmiController implements Serializable {

/**
 * 
 */
  private static final long serialVersionUID = 1L;


  BMI bmiBean = new BMI(); 

public BMI getBmiBean() {
    return bmiBean;
}

public void setBmi (BMI bmiBean) {
    this.bmiBean = bmiBean;
}

public void calculate() {


    String message1 = ("%s Your BMI is" + bmiBean.bmi() + "%s and you are" + bmiBean.bmi());            
    FacesContext context = FacesContext.getCurrentInstance();
    context.addMessage("messages", new FacesMessage(FacesMessage.SEVERITY_INFO,"1234", message1));


}

}

Answer 1

在 xhtml 页面中将您的 #{BmiController.weight} 更改为 #{bmiController.weight} 即可。

将所有 BmiController 替换为 XHTML 页面中的 bmiController。

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