将.jar文件导入Scala环境 [英] Importing .jar files into Scala environment

问题描述

即使在阅读之后: Scala，jar文件有问题，我还是有点困惑.我试图将一些包导入我的Scala文件，即使添加到类路径后，解释器也无法识别它们.

Even after reading: Scala, problem with a jar file, I'm still a bit confused. I am trying to import some packages into my Scala file, and the interpreter is not recognizing them even after adding to classpath.

一个例子:

我有导入语句:

import org.json4s._

我从此处下载了.jar: http://mvnrepository.com/artifact/org.json4s/json4s-native_2.10/3.2.4

I downloaded the .jar from here: http://mvnrepository.com/artifact/org.json4s/json4s-native_2.10/3.2.4

并使用以下命令添加到解释器类路径:

and added to the interpreter classpath using:

scala> :cp /Users/aspangher13/Downloads/json4s-native_2.10-3.2.4.jar

Scala确认类路径:

Scala acknowledges the classpath:

Your new classpath is: ".:/Users/aspangher13/Downloads/json4s-native_2.10-3.2.4.jar:/Users/aspangher13/Downloads/jna-3.5.2.jar"

但仍会引发此错误:

<console>:7: error: object scalatra is not a member of package org
   import org.json4s._

有人可以看到我在做什么错吗?谢谢！

Can anyone see what I'm doing wrong? Thanks!!

作为后续，有人知道在哪里找到该软件包:JsonAST ._?

And as a followup, does anyone know where to find the package: JsonAST._?

推荐答案

简单一点，创建一个sbt小项目.

Go the simple and create a little sbt project.

第一步-创建一个项目

出于您的目的，您不需要复杂的构建.因此，只需创建两个文件:

For your purposes you don't need a complex build. So just create two files:

./build.sbt

name := "name your project"

version := "0.1"

scalaVersion := "2.10.2" // or whatever you prefer

./project/build.properties

sbt.version=0.12.4

只需转到项目根文件夹并调用sbt

The just go to the project root folder and call sbt

第二步-添加依赖项

打开您的./build.sbt文件并添加:

libraryDependency ++= Seq(
  "org.scalatra" %% "scalatra" % "2.2.1",
  "org.scalatra" %% "scalatra-scalate" % "2.2.1",
  "org.scalatra" %% "scalatra-specs2" % "2.2.1" % "test",
  "org.json4s"   %% "json4s-native % "3.2.4",
  "net.java.dev.jna" & "jna" & "3.5.2"
)

第三步-运行控制台

不要忘记用reload任务重新加载sbt，然后调用console或console-quick任务.这应该起作用.

Don't forget to reload sbt with reload task, and then call console or console-quick task. This should work.

但是有更简单的方法可以做到这一点:

But there are easier ways to do this:

1)使用gitter8- Scalatra gitter8项目
2)深入了解 Scalatra sbt依赖项

1) Use gitter8 - Scalatra gitter8 project
2) Read little into about Scalatra sbt dependencies

这篇关于将.jar文件导入Scala环境的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！