How to schedule pre- or post-build actions for a java project in eclipse

I need to know how to schedule pre- or post-build actions for a java project in eclipse. I need to launch a script for creating custom configuration files and directories. Ideally, the script should ask a parameter to the developer or (even better) read a environment variable.
fhosterAsked:
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Matt_BuCommented:
Right-click on the project and select --> build path --> Configure build path...
Select the Builders option from the left list.
From there you have several options depending on your configuration and plugins.

I think base eclipse in a java project has at least Ant builder and program.  I have had the most joy using ant builders because I haven't found anything I had to do that I couldn't do with ant but you can do another java program, a shell script, etc.

I'll explain the ant method in more detail:
From the Builders option select the new button on the right.  Then select the Ant Builder and choose the ant build.xml file containing the targets you want to run which should already have been created and stored somewhere in the workspace (I always create them in the project I'm working on but they can be in another project.  

Then you have tons of options and configurations available such as refreshing the workspace after the build, what types of builds to run (the order that the builders appear in the list is the order they will run) and which targets in the ant file to run, use the built-in JRE or an external one, classpath options, allocate console to view the results of the build action, etc.

You have access to several built-in variables when running ant scripts inside the IDE and you can create new ones or reference properties files in the configuration.
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