找不到jsf 2.0托管bean的属性 [英] jsf 2.0 managed bean's property not found

问题描述

JSF错误:/fstation/search.jspx(24,62) '#{vManager.fStations}' Property 'fStations' not found on type vm.beans.VisitorManagertype

vManager是我管理过的:

vManager is my managed been:

search.jspx

search.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>

---

管理这样的代码:

---

managed been code like this:

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;
    }
}

推荐答案

如果属性名称以两个或多个大写字符开头，则将假定为这种情况.吸气剂getFStations()表示属性名称为FStations，因此您应该这样访问它:

If a property name starts with two or more uppercased characters, then it will be assumed to be in exactly that case. The getter getFStations() indicates a property name of FStations, so you should then access it as such:

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

这在 JavaBeans规范:

8.8推断名称的大写.

...

8.8 Capitalization of inferred names.

...

因此，当我们从现有Java名称的中间提取属性或事件名称时， 通常将第一个字符转换为小写.但是，为了支持偶尔使用所有大写的名称，我们检查名称的前两个字符是否均为大写，是否保留为大写.例如，

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"成为"fooBah"
• "Z"变成"z"
• "URL"成为"URL"

• "FooBah" becomes "fooBah"
• "Z" becomes "z"
• "URL" becomes "URL"

我们提供了一种方法 Introspector.decapitalize 来实现此转换规则.

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字段名称来定义/解析的.

Note that the property name is definied/resolved based on getter method name, not on private field name.

无关与具体问题无关，但是我强烈建议不要缩写这样的属性名称.您的代码是这种方式，不能自我记录.别偷懒，写出完整的单词:

Unrelated to the concrete problem, I however strongly recommend to not abbreviate property names like that. Your code is this way not self-documenting. Don't be lazy and write words full out:

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

或者也许:

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

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