尝试嵌套JSF表达式字符串 [英] Trying to nest JSF expression strings

问题描述

我想知道是否可以通过问题ExtendedBeanELResolver 字符串>嵌套-jsf-表达式字符串来处理此嵌套的EL表达式：

I'd like to know whether it is possible to adapt the ExtendedBeanELResolver from the question nesting-jsf-expression-strings as well to handle this nested EL expression:

#{controllerBean.getBean('userProfileBean', component).street}*

其中 controllerBean.getBean 返回bean userProfileBean 。我将使用 ExtenedBeanELResolver 以下异常：

whereby controllerBean.getBean returns the bean userProfileBean. I'll get with the ExtenedBeanELResolver following exception:

SCHWERWIEGEND: javax.el.PropertyNotFoundException: /WEB-INF/templates/modification/userProfile.xhtml @35,196 value="#{controllerBean.getBean('userProfileBean', component).street}": Property 'getBean' not found on type com.something.ControllerBean

如果我插入其他括号，它可以工作，但看起来比现在更丑：

If I insert additional brackets it works, but looks even more ugly than now:

#{(controllerBean.getBean('userProfileBean', component)).street}*

是否可以不用其他括号？

Is it possible to do without the additional brackets?

在CycDemo回答后更新1：

奇怪的问题。
如果我把

Strange problem. If i put the

<h:inputText value="#{beanOne.getBean('data').title}" />

内部页面呈现的表单，但仅在我提交表单之前。之后，将显示相同的错误。

inside a form the page renders, but only until i submit the form. After that the same error will be shown.

WARNUNG: /WEB-INF/templates/home.xhtml @61,66 value="#{beanOne.getBean('data').title}": Property 'getBean' not found on type com.something.BeanOne

如果我将其更改为

<p:inputText value="#{beanOne.getBean('data').title}" />

该页面甚至在一开始都不会呈现。
我认为问题在于，JSF正在尝试在提交表单时调用setter，但无法正确评估它。

the page won't even render in the beginning. I think the problem is that the JSF is trying to call the setter when the form is submitted but can't evaluate it correctly.

有什么想法吗？

更新2

显然JSF试图调用 getGetBean（） ，因为它正在 BeanOne 上寻找属性（我在Eclipse中有一个断点），这是错误的：

Appearently JSF is trying to call getGetBean() because it is looking for a property on BeanOne (I had a breakpoint there in eclipse) which is wrong:

@ManagedBean
@ViewScoped
public class BeanOne {

  private Object bean = new String("something");

  public Object getBean(String name) {
    FacesContext context = FacesContext.getCurrentInstance();
    return context.getApplication().evaluateExpressionGet(context,
        "#{" + name + "}",
        Object.class);
  }

  public Object getGetBean() {
    return bean; // <-- will be called by JSF
  }

  public void setGetBean(Object bean) {
    this.bean = bean;
  }

}

推荐答案

确定

    #{(controllerBean.getBean('userProfileBean', component)).street}
    change to
    #{controllerBean.getBean('userProfileBean', component).street}

当我测试时，它在JSF 2.0中有效。

It is work in JSF 2.0 when I test.

使用 jboss-el 。下载jar文件此处

Use jboss-el. Download jar file here

BeanOne.java
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;

BeanOne.java import javax.faces.bean.ManagedBean; import javax.faces.bean.RequestScoped;

@ManagedBean(name="BeanOne")
@RequestScoped
public class BeanOne {
    private Data data;

    public Data getBean(String title) {
        data = new Data(title);
        return data;
    }
    public void show() {
        System.out.println("User Input ==>" + data.getInput());
    }
}

Date.java

Date.java

public class Data {
    private String title;
    private String input;

    public Data(String title) {
        this.title = title;
    }

    public String getInput() {
        return input;
    }

    public void setInput(String input) {
        this.input = input;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }
}

pageOne.xtml

pageOne.xtml

<h:form>
    <h:inputText value="#{BeanOne.getBean('Test').input}"/><br/>
    <h:commandButton value="Show" action="#{BeanOne.show}"/>
</h:form>

在web.xml中添加以下配置

add the following configuration in web.xml

<context-param>     
    <param-name>com.sun.faces.expressionFactory</param-name>
    <param-value>org.jboss.el.ExpressionFactoryImpl</param-value>   
</context-param>

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