Spring Support infix expression calculation in NumberUtils

In the process of using springboot, I especially hope to write the calculation expression directly in the yaml configuration file

Comment From: pivotal-cla

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Comment From: pivotal-cla

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Comment From: sbrannen

Hi @jackycjw,

Thanks for submitting your first proposal to the Spring Framework.

Unfortunately, we do not currently have any concrete needs for infix expression calculation in the core framework and especially not in a core utility such as NumberUtils.

In light of that, I am closing this PR.

Please note, however, that you may find the Spring Expression Language (SpEL) useful as an alternative.