如何检查用@WindowScoped存储的对象是否正确存储? [英] How can I check if an object stored with @WindowScoped is stored correctly?
问题描述
两天前，我写了这个问题: 如何在@WindowScoped上检索对象? BalusC提出了一些建议，现在我有一些问题需要了解，如果我的问题是WindowScoped中的对象是否正确存储或我的代码检索错误了！
好吧，正如我所说，我有一个对象存储在@WindowScoped批注中，但是我只能在第一次时检索该对象！为什么?
我只是有一个疑问:MyFaces的CODI扩展可以以某种方式配置吗?或者我可以简单地将jar文件添加到我的项目中来使用它?
但是，这些是我的代码的一部分，因为我不知道问题出在哪里:
LogicBean.java(我应该检索的对象):
@ManagedBean (name="logicBean" )
@WindowScoped
public class LogicBean implements Serializable
{
String pageIncluded;
// getter and setter methods
public String action(String value)
{
setPageIncluded(value);
return "include";
}
}
include.xhtml:
<ui:include src="#{logicBean.pageIncluded}"/>
ProgettiController.java
@ManagedBean(name = "progettiController")
@SessionScoped
public class ProgettiController implements Serializable {
private FacesContext context = FacesContext.getCurrentInstance();
private LogicBean logicBean = context.getApplication().evaluateExpressionGet(context, "#{logicBean}", LogicBean.class);
//getter and setter methods
public void testMethod()
{
logicBean.action("WEB-INF/jsf/page1.xhtml");
}
}
我也尝试使用@ManagedProperty(#{logicBean}")并将范围设置为WindowScoped，但没有任何变化...
经过一些新的试验，我发现一个奇怪的问题，在我的include.xhtml上，我添加了#{progettiController.logicBean.getPageIncluded()}和#{logicBean.getPageIncluded()}来检查这两个字段?
好吧，当我第一次加载应用程序时，正确设置了变量并看到了我想要的东西，第二次，第一个变量设置了新值，但是第二个为空，什么也看不到，但现在来了奇怪的事情...如果我应该再次尝试该应用程序，则应打开index.xhtml，其中包含以下形式:
<h:form>
<h:commandLink action="#{logicBean.action('/WEB-INF/jsf/progetti/List.xhtml')}" value="Show All Progetti Items"/>
</h:form>
是什么结果? 第一个变量仍设置为旧值(错误)，但第二个变量设置正确，因此我可以像往常一样查看页面！ 如果有人可以帮助我，我将永远感谢他/她！
CODI是CDI的扩展，因此您应该通过CDI @Named批注而不是JSF @ManagedBean批注来管理bean.然后，您可以通过CDI @Inject注释注入另一个bean.以下示例应该起作用:
import javax.inject.Named;
import org.apache.myfaces.extensions.cdi.core.api.scope.conversation.WindowScoped;
@Named
@WindowScoped
public class LogicBean implements Serializable {
// ...
}
和
import javax.enterprise.context.SessionScoped;
import javax.inject.Inject;
import javax.inject.Named;
@Named
@SessionScoped
public class ProgettiController implements Serializable {
@Inject
private LogicBean logicBean;
// ...
}
Two days ago I wrote this question: How can I retrieve an object on @WindowScoped? and BalusC answered with some suggestions, now I have some problem to understand if my problem is that the object in WindowScoped is stored properly or my code to retrieve it is wrong!
Well, as I said, I have an object that I stored in @WindowScoped annotation but I can retrive this object only the first time! Why?
I just have a doubt: the CODI extension of MyFaces could be configured in some manner? Or I can use it simple adding the jar files to my project?
However, these are parts of my code because I don't know where is the problem:
LogicBean.java (the object that I should retrive):
@ManagedBean (name="logicBean" )
@WindowScoped
public class LogicBean implements Serializable
{
String pageIncluded;
// getter and setter methods
public String action(String value)
{
setPageIncluded(value);
return "include";
}
}
include.xhtml:
<ui:include src="#{logicBean.pageIncluded}"/>
ProgettiController.java
@ManagedBean(name = "progettiController")
@SessionScoped
public class ProgettiController implements Serializable {
private FacesContext context = FacesContext.getCurrentInstance();
private LogicBean logicBean = context.getApplication().evaluateExpressionGet(context, "#{logicBean}", LogicBean.class);
//getter and setter methods
public void testMethod()
{
logicBean.action("WEB-INF/jsf/page1.xhtml");
}
}
I tried also using @ManagedProperty("#{logicBean}") and setting the scope as WindowScoped but nothing change...
EDIT: after some new trials I found a strange problem, on my include.xhtml I added #{progettiController.logicBean.getPageIncluded()} and #{logicBean.getPageIncluded()} for check these two fields o?
Well, when I load the application for the first time the variables are correctly set and I see what I want, the second time the first variable is setted with the new value but the second is empty and I don't see anything, but now is coming the strange thing... if I should try again the app I should open index.xhtml where I had some forms like this:
<h:form>
<h:commandLink action="#{logicBean.action('/WEB-INF/jsf/progetti/List.xhtml')}" value="Show All Progetti Items"/>
</h:form>
and which is the result? The first variable remains set with the old value (wrong) but the second is setted correctly so I can review the page like I would! If someone can help me I will thank him/her forever!
CODI is an extension to CDI, so you should manage your beans by CDI @Named annotation instead of the JSF @ManagedBean annotation. Then you can inject the other bean by CDI @Inject annotation. The following example should work:
import javax.inject.Named;
import org.apache.myfaces.extensions.cdi.core.api.scope.conversation.WindowScoped;
@Named
@WindowScoped
public class LogicBean implements Serializable {
// ...
}
and
import javax.enterprise.context.SessionScoped;
import javax.inject.Inject;
import javax.inject.Named;
@Named
@SessionScoped
public class ProgettiController implements Serializable {
@Inject
private LogicBean logicBean;
// ...
}
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