我以前对托管bean的问题似乎不太清楚。因此,我将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() {
}
}
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() {
}
}
我应该在speakHello()中标记
???
的空白处输入什么。如何获得该豆中其他豆的价值? 最佳答案
正如您在JSF2 tutorial中所了解的那样,可以使用依赖项注入功能。在您的情况下,这是关于将MasterBean
实例注入到pageBean
中。我相信您的pageBean
中可能会有类似的内容:
@ManagedBean(name="pageBean")
@ViewScoped
public class pageBean {
private String content;
@ManagedProperty(value="#{MasterBean}")
private MasterBean masterBean;
...
然后在您的方法中使用它:
public void speakHello(){
//how do i get value of laaala here which is in MasterBean???
content = masterBean.getLaala() + " Hello friend";
}
我自己还没有尝试过。我希望它能起作用。
顺便说一句,强烈建议不要以小写字母开头课程名称。因此,应将
pageBean
类称为PageBean
。