sbt默认目录结构

sbt的默认目录结构与Maven的结构类似，以下以HelloWorld工程来对其进行描述。具体可参考sbt官网

HelloWorld  (base directory)    build.sbt    .gitignore  (用于忽略文件或目录)    project/        xx.scala (defines helper objects and one-off plugins，辅助对象和一次性插件)        xx.sbt (并不等价于基本目录下的sbt文件)    src/        main/            resources/ (files to include in main jar here)            scala/ (main scala sources)            java/ (main java sources)        test/            resources/ (files to include in test jar here)            scala/ (test scala sources)            java/ (test java sources)    target/ (generated files, like compiled classes, packaged jars, managed files, caches, and documentation)