Working with Ant Properties File
Ant properties files let you move properties out of you build.xml file. Once you create a property file, IntelliJ IDEA recognizes the file and tries to match key-value-pairs from that file against the Ant or Java files. If the match is found, IntelliJ IDEA lets you use a link between properties of those files, ensures the correct rename of the keys and updates the links accordingly.
.properties file for all the properties that are defined outside the build file. For example, properties that you define in build settings. IntelliJ IDEA keeps those properties in one place and you don't need to edit the generated build file.
- Include a property in your build.xml file with the name of the properties file specified by the file attribute. For example,