gradle本地文件仓库 (52.6.5. Flat directory repository)

If you want to use a (flat) filesystem directory as a repository, simply type:

Example 52.32. Flat repository resolver

build.gradle

repositories {
    flatDir {
        dirs 'lib'
    }
    flatDir {
        dirs 'lib1', 'lib2'
    }
}

This adds repositories which look into one or more directories for
finding dependencies. Note that this type of repository does not support
any meta-data formats like Ivy XML or Maven POM files. Instead, Gradle
will dynamically generate a module descriptor
(without any dependency information) based on the presence of
artifacts. However, as Gradle prefers to use modules whose descriptor
has been created from real meta-data rather than being generated, flat
directory repositories cannot be used to override artifacts
with real meta-data from other repositories. So, for example, if Gradle
finds only
jmxri-1.2.1.jar in a flat directory repository, but
jmxri-1.2.1.pom in another repository that
supports meta-data, it will use the second repository to provide the
module. For the use case of overriding remote artifacts with local ones
consider using an Ivy or Maven repository instead
whose URL points to a local directory. If you only work with flat
directory repositories you don't need to set all attributes of a
dependency. See
Section 52.4.8, “Optional attributes”.

这种类型的仓库不支持 元数据 格式 如 Lvy XML,  Maven POM 文件