Gradle复制任务:如何避免在复制子目录内容时创建子目录

task copyFiles(type: Copy) {
    from 'sourceDir'
    into 'destinationDir'
    include '**/*'
    eachFile { fileCopyDetails ->
        // 获取相对路径
        def relativePath = fileCopyDetails.relativePath
        // 移除子目录部分
        def fileName = relativePath.substring(relativePath.lastIndexOf('/') + 1)
        // 设置复制后的文件名
        fileCopyDetails.path = fileName
    }
}