silverghost

在网络上有非常多的观点关于建立Scala项目时用Maven还是sbt,如果你使用java很长时间一定很喜欢Maven而不是用Ant，但是如果你想创建Scala项目，那sbt一定是个不错的选择，因为他因为他就是为此而生,从而有很多功能和特点去支持这个编程语言.

现在先介绍一下如何安装sbt:

下载 sbt-launch.jar
然后拷贝这个文件到你系统的bin文件夹下,比如我:
zhichao@desktop:~$ sudo mv sbt-launch-0.7.7.jar /usr/local/bin/sbt-launcher.jar
创建脚本文件叫sbt,内容是这样的
echo “java -Xmx512M -jar /usr/local/bin/sbt-launcher.jar \”\$@\”" | sudo tee /usr/local/bin/sbt
执行赋予文件
sudo chmod +x /usr/local/bin/sbt
如果你正确按着上面说的去做能得到下面的显示:

zhichao@desktop:~$ sbt
Project does not exist, create new project? (y/N/s)

为了创建一个新项目，一个文件夹应该被创建向下面所示:

zhichao@desktop:~/Documents/HelloWorld mkdir HelloWorld
zhichao@desktop:~/Documents/HelloWorld$ cd HelloWorld/
zhichao@desktop:~/Documents/HelloWorld$ sbt
Project does not exist, create new project? (y/N/s)

按着提示输入项目的基本属性

zhichao@desktop:~/Documents/HelloWorld$ sbt
Project does not exist, create new project? (y/N/s) y
Name: HelloWorld
Organization: de.mobiStudio
Version [1.0]:
Scala version [2.9.0]:
sbt version [0.7.7]:
Getting net.java.dev.jna jna 3.2.3 ...
:: retrieving :: org.scala-tools.sbt#boot-app
	confs: [default]
	1 artifacts copied, 0 already retrieved (838kB/15ms)
Getting Scala 2.7.7 ...
:: retrieving :: org.scala-tools.sbt#boot-scala
	confs: [default]
	2 artifacts copied, 0 already retrieved (9911kB/25ms)
Getting org.scala-tools.sbt sbt_2.7.7 0.7.7 ...
:: retrieving :: org.scala-tools.sbt#boot-app
	confs: [default]
	17 artifacts copied, 0 already retrieved (4379kB/41ms)
[success] Successfully initialized directory structure.
Getting Scala 2.9.0 ...
:: retrieving :: org.scala-tools.sbt#boot-scala
	confs: [default]
	4 artifacts copied, 0 already retrieved (20442kB/45ms)
[info] Building project HelloWorld 1.0 against Scala 2.9.0
[info]    using sbt.DefaultProject with sbt 0.7.7 and Scala 2.7.7
>

至此项目已经被创建好了，你可以退出(ctrl+c)创建过程，因为我们需要至少一个类来完成编译.

> run
[info]
[info] == copy-resources ==
[info] == copy-resources ==
[info]
[info] == compile ==
[info]   Source analysis: 0 new/modified, 0 indirectly invalidated, 0 removed.
[info] Compiling main sources...
[info] Nothing to compile.
[info]   Post-analysis: 0 classes.
[info] == compile ==
[info]
[info] == run ==
[info] == run ==
[error] Error running run: No main class specified.
[info]
[info] Total time: 0 s, completed 19 May, 2011 3:39:02 PM
>

zhichao@desktop:~/Documents/HelloWorld$ cd src/main/scala/
zhichao@desktop:~/Documents/HelloWorld/src/main/scala$ gedit HelloWorld.scala

object HelloWorld {
  def main(args: Array[String]) {
    println("Hello, World!")
  }
}

接下来我们应该看到如下提示,

zhichao@desktop:~/Documents/HelloWorld$ sbt run
[info] Building project HelloWorld 1.0 against Scala 2.9.0
[info]    using sbt.DefaultProject with sbt 0.7.7 and Scala 2.7.7
[info]
[info] == compile ==
[info]   Source analysis: 1 new/modified, 0 indirectly invalidated, 0 removed.
[info] Compiling main sources...
[info] Compilation successful.
[info]   Post-analysis: 2 classes.
[info] == compile ==
[info]
[info] == copy-resources ==
[info] == copy-resources ==
[info]
[info] == run ==
[info] Running HelloWorld
<strong>Hello, World!</strong>!
[info] == run ==
[success] Successful.
[info]
[info] Total time: 6 s, completed 25 Nov, 2011 13:45:06 PM
[info]
[info] Total session time: 7 s, completed 25 Nov, 2011 13:45:06 PM
[success] Build completed successfully.
zhichao@desktop:~/Documents/HelloWorld$

至此对sbt的安装和创建已经完成，我们有两种选择，一个是继续用Editor编程或者选择IDE开发，我的选择是将项目引入到Eclipse当中, next….