如何查看jar包版本

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?比如查看spring.jar 中的Spring版本：
查看 spring.jar\META-INF\MANIFEST.MF
Manifest-Version: 1.0
Export-Package: org.springframework.orm.jpa;uses:="org.apache.commons.
?logging,org.aopalliance.intercept,org.springframework.beans,org.sprin
?gframework.dao.support,org.springframework.instrument.classloading,ja
?vax.persistence,...

Spring-Version: 2.5.4
Implementation-Title: Spring Framework
Implementation-Version: 2.5.4
Tool: Bnd-0.0.208

...

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原文件：http://ylzhj01.iteye.com/blog/744757