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关于JSF中托管bean之间的通信(Regarding communication between managed bean in JSF)

 我之前关于托管bean的问题似乎并不清楚。 所以，我以更系统的方式再次发布它。  
 我有一页：  
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:ui="http://java.sun.com/jsf/facelets">
    <h:head>
        <title>Facelet Title</title>
    </h:head>
    <h:body>
        <ui:insert name="head">

        </ui:insert>

        <br/><br/>
        <h:inputText value="#{MasterBean.laala}"/>
        <br/><br/>

        <ui:insert name="content">

        </ui:insert>
    </h:body>
</html>
 
 这是它的豆子：  
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;


@ManagedBean(name="MasterBean")
@ViewScoped
public class MasterBean {

    private String laala;

    public String getLaala() {
        return laala;
    }

    public void setLaala(String laala) {
        this.laala = laala;
    }


    public MasterBean() {
    }

}
 
 这是使用master.xhtml的data.xhtml：  
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:ui="http://java.sun.com/jsf/facelets">
    <h:head>
        <title>Facelet Title</title>
    </h:head>
    <h:body>
        <ui:composition template="master.xhtml">
            <ui:define name="head">
                laala
            </ui:define>

            <h:outputText value="#{pageBean.content}"/>

            <ui:define name="content">
                <h:commandButton actionListener="#{pageBean.speakHello}"/>
            </ui:define>>


        </ui:composition>
    </h:body>
</html>
 
 这是它的豆子：  
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;


@ManagedBean(name="pageBean")
@ViewScoped
public class pageBean {

    private String content;

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }


    public void speakHello(){
        //how do i get value of laaala here which is in MasterBean???
        content = ??? + " Hello friend";
    }

    public pageBean() {
    }

}
 
 我应该把空白放在哪里??? 在speakHello（）中标记。 如何获得此bean中其他bean的值？ 

It seems I am not clear on my previous question about managed bean. So, I am posting it again in a more systematic manner. 
I have one page: 
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:ui="http://java.sun.com/jsf/facelets">
    <h:head>
        <title>Facelet Title</title>
    </h:head>
    <h:body>
        <ui:insert name="head">

        </ui:insert>

        <br/><br/>
        <h:inputText value="#{MasterBean.laala}"/>
        <br/><br/>

        <ui:insert name="content">

        </ui:insert>
    </h:body>
</html>
 
This is its bean: 
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;


@ManagedBean(name="MasterBean")
@ViewScoped
public class MasterBean {

    private String laala;

    public String getLaala() {
        return laala;
    }

    public void setLaala(String laala) {
        this.laala = laala;
    }


    public MasterBean() {
    }

}
 
This is data.xhtml which uses master.xhtml: 
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:ui="http://java.sun.com/jsf/facelets">
    <h:head>
        <title>Facelet Title</title>
    </h:head>
    <h:body>
        <ui:composition template="master.xhtml">
            <ui:define name="head">
                laala
            </ui:define>

            <h:outputText value="#{pageBean.content}"/>

            <ui:define name="content">
                <h:commandButton actionListener="#{pageBean.speakHello}"/>
            </ui:define>>


        </ui:composition>
    </h:body>
</html>
 
This is its bean: 
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;


@ManagedBean(name="pageBean")
@ViewScoped
public class pageBean {

    private String content;

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }


    public void speakHello(){
        //how do i get value of laaala here which is in MasterBean???
        content = ??? + " Hello friend";
    }

    public pageBean() {
    }

}
 
What should I put in the blank where ??? is marked in speakHello(). How do I get value of other bean in this bean?

原文：https://stackoverflow.com/questions/2779480

更新时间：2022-07-20 09:07

最满意答案

 您不需要使用主输出或内容文件。 您只需将单个文件（或在IDE中添加它们）拖到文件系统视图中的所需文件夹中即可。 因此，对于您的文本文件，只需将其添加到（例如）CommonAppData或用户的个人数据文件夹中，然后您可以右键单击文本文件，创建快捷方式并将快捷方式拖动到用户的Dektop或任何您想要的位置。 

You don't need to use either Primary Output or Content Files. You can just drag the individual files (or add them in the IDE) into the required folder in the File System view. So, for your text file, just add it into (say) the CommonAppData or User's Personal Data folder, then you can right-click on the text file, create shortcut and drag the shortcut to User's Dektop or wherever you want it.

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