JSF的问题

Question

没用过JSF。up！
在家/公司过节的人，来看一下。

Answer 1

是不是这个呀？private static Application getApplication() {
ApplicationFactory appFactory = (ApplicationFactory)FactoryFinder.getFactory(FactoryFinder.APPLICATION_FACTORY);
return appFactory.getApplication(); 
}

private static ValueBinding getValueBinding(String el) {
return getApplication().createValueBinding(el);
}

Answer 2

费心了，各位大大  xu_xinyu(雪候鸟) 我也是用到的createValueBinding()方法，全部代码如下
public class MyActionListener implements ActionListener{    public PhaseId getPhaseId(){
     return PhaseId.INVOKE_APPLICATION;
    }
public void processAction(ActionEvent event)  {
System.out.println("processAction");
FacesContext facesContext=FacesContext.getCurrentInstance();
Object firstNumber=getValueBinding("numberBean.firstNumber").getValue(facesContext);
Object secondNumber=getValueBinding("numberBean.secondNumber").getValue(facesContext);
String command=event.getComponent().getId();
if (command.equals("add")){
try{
int firstNo=Integer.parseInt(firstNumber.toString());
int secondNo=Integer.parseInt(secondNumber.toString());
String result=Integer.toString(firstNo+secondNo);
System.out.println("processAction.result"+result);
getValueBinding("numberBean.result").setValue(facesContext,result);
}
catch(Exception e){

}
}else if(command.equals("subtract")){
try{
int firstNo=Integer.parseInt(firstNumber.toString());
int secondNo=Integer.parseInt(secondNumber.toString());
String result=Integer.toString(firstNo-secondNo);
System.out.println("processAction.result"+result);
getValueBinding("numberBean.result").setValue(facesContext,result);
}catch(Exception e){

}
} }
private static Application getApplication() {
ApplicationFactory appFactory = (ApplicationFactory)FactoryFinder.getFactory(FactoryFinder.APPLICATION_FACTORY);
return appFactory.getApplication(); 
}


private static ValueBinding getValueBinding(String valueRef){

return getApplication().createValueBinding(valueRef);                               //预计错误在此
}
}
运行时报错中有如下一条
javax.faces.el.ReferenceSyntaxException: numberBean.firstNumber
com.sun.faces.application.ApplicationImpl.createValueBinding(ApplicationImpl.java:281)
可能还是方法引用的错误

Answer 3

getValueBinding（）方法用来获得javaBean的属性。