不建议使用JSF 1.x ValueBinding，正确的替换方法是什么？

Question

我有一些JSF 1.0/1.1代码:

FacesContext context = FacesContext.getCurrentInstance();
ValueBinding vb = context.getApplication().createValueBinding("#{someBean}");
SomeBean sb = (SomeBean) vb.getValue(context);

从JSF 1.2开始， ValueBinding is deprecated and replaced by ValueExpression 。我不确定如何更改以上代码以使用 ValueExpression。

Answer 1

那个部分

ValueBinding vb = context.getApplication().createValueBinding("#{someBean}");
SomeBean sb = (SomeBean) vb.getValue(context);

应该替换为

ValueExpression ve = context.getApplication().getExpressionFactory().createValueExpression(context.getELContext(), "#{someBean}", SomeBean.class);
SomeBean sb = (SomeBean) ve.getValue(context.getELContext());

或更好

SomeBean bc = context.getApplication().evaluateExpressionGet(context, "#{someBean}", SomeBean.class);

也可以看看:

Get JSF managed bean by name in any Servlet related class

How to create dynamic JSF form fields