将 .jar 添加到类路径 (Scala)
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Adding .jar's to classpath (Scala)
提问by adelbertc
So I've been trying to work with the signal-collectframework and I downloaded the .jarfiles and extracted it into a folder. Currently the folder structure looks like:
所以我一直在尝试使用信号收集框架，我下载了.jar文件并将其解压缩到一个文件夹中。目前文件夹结构如下所示：
LICENSE.txt
PageRank.scala
core-1.1.1-sources.jar
dependencies/
javaapi-1.1.1-sources.jar
NOTICE.txt
README.txt
core-1.1.1.jar
javaapi-1.1.1-javadoc.jar
javaapi-1.1.1.jar
Where PageRank.scalais the Scala test code they provide, which is:
PageRank.scala他们提供的 Scala 测试代码在哪里，即：
import com.signalcollect._
object PageRank extends App {
val graph = GraphBuilder.build
graph.addVertex(new PageRankVertex(id=1))
graph.addVertex(new PageRankVertex(id=2))
graph.addEdge(new PageRankEdge(sourceId=1, targetId=2))
graph.addEdge(new PageRankEdge(sourceId=2, targetId=1))
graph.execute
graph.foreachVertex(println(_))
graph.shutdown
}
class PageRankVertex(id: Any, dampingFactor: Double=0.85)
extends DataGraphVertex(id=id, state=1-dampingFactor) {
type Signal = Double
def collect(oldState: Double, mostRecentSignals: Iterable[Double]): Double = {
1 - dampingFactor + dampingFactor * mostRecentSignals.sum
}
}
class PageRankEdge(sourceId: Any, targetId: Any)
extends DefaultEdge(sourceId, targetId) {
type SourceVertex = PageRankVertex
def signal(sourceVertex: PageRankVertex) = {
sourceVertex.state * weight / sourceVertex.sumOfOutWeights
}
}
I am a newbie when it comes to the JVM/Java/Scala, and this was my attempt at adding the .jar'sto the classpath for compiling PageRank.scala:
我是 JVM/Java/Scala 的新手，这是我尝试将 加入.jar's到类路径以进行编译PageRank.scala：
$ scalac -classpath *.jar dependencies/*.jar PageRank.scala
error: IO error while decoding core-1.1.1.jar with UTF-8
Please try specifying another one using the -encoding option
error: IO error while decoding javaapi-1.1.1-javadoc.jar with UTF-8
Please try specifying another one using the -encoding option
error: IO error while decoding javaapi-1.1.1-sources.jar with UTF-8
Please try specifying another one using the -encoding option
error: IO error while decoding javaapi-1.1.1.jar with UTF-8
Please try specifying another one using the -encoding option
error: IO error while decoding dependencies/je-3.2.76.jar with UTF-8
Please try specifying another one using the -encoding option
error: IO error while decoding dependencies/scala-library-2.9.1.jar with UTF-8
Please try specifying another one using the -encoding option
6 errors found
I cannot figure out what is going wrong... what's happening? Thanks! Regards, -kstruct
我不知道出了什么问题......发生了什么？谢谢！问候，-kstruct
回答by dhg
You need to pass both classpath paths as a single argument.
您需要将两个类路径路径作为单个参数传递。
Try this:
试试这个：
$ scalac -classpath "*.jar:dependencies/*.jar" PageRank.scala
$ scala -classpath "*.jar:dependencies/*.jar" PageRank
PageRankVertex(id=2, state=0.9999999999999997)
PageRankVertex(id=1, state=0.9999999999999997)
It worked for me.
它对我有用。
回答by Maksym
It seems that depending on an installed version of Java, wildcards in classpath to include multiple JARs might or might not work. I found this trickelsewhere on StackOverflow (note that you can have as many folders after the 'echo' as you wish, separated by spaces):
似乎根据已安装的 Java 版本，类路径中包含多个 JAR 的通配符可能有效，也可能无效。我在 StackOverflow 的其他地方发现了这个技巧（请注意，您可以根据需要在“回声”之后拥有任意数量的文件夹，以空格分隔）：
scalac -classpath $(echo *.jar dependencies/*.jar | tr ' ' ':') PageRank.scala
scala -classpath $(echo *.jar dependencies/*.jar | tr ' ' ':') PageRank
回答by Maksym
for simplicity ,you can just use: scala -classpath $(echo *.jar dependencies/*.jar | tr ' ' ':') PageRank.scala
为简单起见，您可以使用： scala -classpath $(echo *.jar dependencies/*.jar | tr ' ' ':') PageRank.scala
