我正在尝试使用JSF 2.0(过去几个月使用ICEfaces 1.8之后),我试图找出为什么在JSF 2.0中我的支持bean构造函数被多次调用.
bean应该在创建时实例化一次,但每当我单击commandButton时,就会显示"Bean Initialized"文本,指示一个新的Bean对象被实例化.
facelet页面:
<?xml version='1.0' encoding='UTF-8' ?>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html">
<h:body>
<div id="content">
<h:form id="form">
<h:commandButton value="Toggle" action="#{bean.toggleShowMe}"/>
</h:form>
<h:panelGrid rendered="#{bean.showMe}">
<h:outputText value="Show me!"/>
</h:panelGrid>
</div>
</h:body>
</html>
支持bean:
@ManagedBean
@RequestScoped
public class Bean {
private boolean showMe = false;
public boolean isShowMe() {
return showMe;
}
public void setShowMe(boolean showMe) {
this.showMe = showMe;
}
public void toggleShowMe(){
System.out.println(showMe);
if(showMe==true){
showMe=false;
}else{
showMe=true;
}
}
/** Creates a new instance of Bean */
public Bean() …