How to extract list of packages from JAR file

I’m currently working on some project using NetBeans Platform. This project need to have list of public packages from the jar in configuration file. So I write this quite simple code to do it manually

unzip -vb commons-beanutils-1.8.0.jar 
      | grep 00000 | cut -c 59- | grep -v META-INF 
      | tr / . 
      | awk '{print "<publicPackage>" $1 "*" "</publicPackage>"}'

A the result is

<publicPackage>org.*</publicPackage>
<publicPackage>org.apache.*</publicPackage>
<publicPackage>org.apache.commons.*</publicPackage>
<publicPackage>org.apache.commons.beanutils.*</publicPackage>
  ...
<publicPackage>org.apache.commons.collections.*</publicPackage>

I love unix text processing utilities…

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