如何从scala制作一个jar文件 [英] How to make a jar file from scala

问题描述

我在线阅读过可以从sci代码创建一个可以从cli运行的jar文件。所有写的都是以下代码。如何从中制作jar文件？我正在使用sbt 0.13.7。

I have read online that it is possible to create a jar file from scala code that could be run from the cli. All have written is the following code. How do I make a jar file from it? I am using sbt 0.13.7.

object Main extends App {
    println("Hello World from Scala!")
}

推荐答案

能够执行使用Scala进行复杂的构建任务，您必须使用SBT作为构建工具：它是创建应用程序包的默认scala方式。要向项目添加SBT支持，只需在根文件夹中创建 build.sbt 文件：

To be able to perform complex build tasks with Scala, you have to use SBT as a build tool: it's a default scala-way of creating application packages. To add SBT support to your project, just create a build.sbt file in root folder:

name := "hello-world"

version := "1.0"

scalaVersion := "2.11.6"

mainClass := Some("com.example.Hello")

构建一个jar文件你的应用程序，如果你没有外部依赖，你可以运行 sbt包，它将构建一个 hello-world_2.11_1.0.jar 包含代码的文件，因此您可以使用 java -jar hello-world.jar 运行它。但是你肯定必须在代码中加入一些依赖项，至少是因为Scala运行时。

To build a jar file with your application in case if you have no external dependencies, you can run sbt package and it will build a hello-world_2.11_1.0.jar file with your code so you can run it with java -jar hello-world.jar. But you definitely will have to include some dependencies with your code, at least because of a Scala runtime.

使用 sbt-assembly 插件，用于构建包含所有依赖项的胖jar。要安装它，请添加一行

Use sbt-assembly plugin to build a fat jar with all your dependencies. To install it, add a line

addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.12.0")

到你的项目/ plugins.sbt 文件（如果没有这样的文件则创建它）并从控制台运行 sbt assembly 任务。

to your project/plugins.sbt file (and create it if there's no such file) and run sbt assembly task from console.

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