jsf 2.0 托管 bean 的属性未找到

Question

JSF 错误:/fstation/search.jspx(24,62) '#{vManager.fStations}' 在 vm.beans.VisitorManagertype 类型上找不到属性 'fStations'

vManager 是我的托管对象:

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搜索.jspx

<h:form>
     <h:dataTable value="#{vManager.fStations}" var="row">
          <h:column>
              <f:facet name="header"><h:outputText value="ID"/></f:facet>
              <h:outputText value="#{row.id}"/>
          </h:column>
          <h:column>
               <f:facet name="header"><h:outputText value="NAME"/></f:facet>
              <h:outputText value="#{row.name}"/>
          </h:column>
     </h:dataTable>
</h:form>

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管理代码如下:

package vm.beans;
import vm.model.DataManager;
import java.util.ArrayList;
import java.util.List;

public class VisitorManager {

    private List<FireStation> fStations;
    private DataManager dataManager = new DataManager();
    private String fireStationName;

    public String searchFireStation(){
        //String fName =fStation.getName();
        System.out.println("this is "+fireStationName);
        return null;
    }

    public void deleteStation(){    
    }

    /*
    * getter and setter
    */

    public String getFireStationName(){
        return fireStationName;
    }

    public void setFireStationName(String name1){
        this.fireStationName=name1;
    }

    public List<FireStation> getFStations(){
        //return dataManager.getFireStations();
        fStations = new ArrayList<FireStation>();
        fStations.add(new FireStation("001", "a1"));
        fStations.add(new FireStation("002", "a2"));
        fStations.add(new FireStation("003", "a3"));
        return fStations;
    }

    public void setFStations(List<FireStation> fs){
        this.fStations = fs;
    }
}

Answer 1

如果属性名称以两个或多个大写字符开头，则将假定它正是这种情况。 getter getFStations() 指示 FStations 的属性名称，因此您应该按如下方式访问它:

<h:dataTable value="#{vManager.FStations}" var="row">

这在 JavaBeans Specification 第 8.8 章中指定:

8.8 Capitalization of inferred names.

...

Thus when we extract a property or event name from the middle of an existing Java name, we normally convert the first character to lower case. However to support the occasional use of all upper-case names, we check if the first two characters of the name are both upper case and if so leave it alone. So for example,

• “FooBah” becomes “fooBah”
• “Z” becomes “z”
• “URL” becomes “URL”

We provide a method Introspector.decapitalize which implements this conversion rule.

请注意，属性名称是根据 getter 方法名称而不是私有(private)字段名称定义/解析的。

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与具体问题无关，但我强烈建议不要缩写这样的属性名称。您的代码是这样的，不是 self 记录的。不要偷懒，把字写完整:

<h:dataTable value="#{visitorManager.fireStations}" var="fireStation">

或者也许:

<h:dataTable value="#{visitor.fireStations}" var="fireStation">