不建议使用JSF 1.x ValueBinding，正确的替换方法是什么? [英] JSF 1.x ValueBinding is deprecated, what is the correct replacement?

问题描述

我有一些JSF 1.0/1.1代码:

I have some JSF 1.0/1.1 code:

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

从JSF 1.2开始，已弃用 ValueBinding并替换为ValueExpression .我不确定如何更改上述代码才能使用ValueExpression.

Since JSF 1.2, ValueBinding is deprecated and replaced by ValueExpression. I'm not sure how to change the above code in order to use ValueExpression.

推荐答案

零件

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

应替换为

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

或者更好

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

另请参见:

• 按名称获取JSF托管bean任何与Servlet相关的类
• 如何创建动态JSF表单字段

See also:

• Get JSF managed bean by name in any Servlet related class
• How to create dynamic JSF form fields

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