运行maven scala项目 [英] running a maven scala project
问题描述
我开始学习scala和mongo,我的IDE是intellij IDEA。我创建了一个scala项目使用
Im starting to learn scala and mongo , my IDE is intellij IDEA. I created a scala project using
mvn:archetype-generate
并在IDEA中键入一个简单的hello world程序,其中包含一些算术选项,例如
and typed a simple hello world program in the IDEA with some arithmetic options such as
println(5)
val i = 1+2
println(i)
然后我使用
mvn编译
它说
build success
但是现在应该如何执行我的应用程序并验证输出。没有一篇文章解释了如何从scala,maven,idea开始,我对这一切都是全新的。任何帮助对我都有用。
But now how should i execute my application and verify the output. There isn't a single article which explains how to start off with scala,maven,idea and i am entirely new to all of this. any help would be useful for me.
推荐答案
maven-exec-plugin
尝试使用此代码:
maven-exec-plugin
Try with this code:
package com.example
object Main {
def main(args: Array[String]) {
println(5)
val i = 1 + 2
println(i)
}
}
将其放在 /src/main/scala/com/example/Main.scala下
并使用以下命令运行:
Place it under /src/main/scala/com/example/Main.scala
and run it using:
$ mvn package exec:java -Dexec.mainClass=com.example.Main
如果您不想传递 mainClass
手动,您可以在插件配置中执行此操作:
If you don't want to pass mainClass
manually, you can do this in plugin configuration:
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.1</version>
<configuration>
<mainClass>com.example.Main</mainClass>
</configuration>
</plugin>
</plugins>
还有其他可能性,这是最简单的。当然在IntelliJ中你应该可以直接运行程序。
There are other possibilities, this is the easiest one. Of course in IntelliJ you should be able to run the program directly.
如果如果您要发送应用程序,请使用 maven-jar-plugin
添加 Main-Class
和 Class-Path
清单的条目:
If you want to ship the application, use maven-jar-plugin
to add Main-Class
and Class-Path
entries to the manifest:
Main-Class: com.example.Main
Class-Path: lib/scala-library-2.9.0-1.jar lib/slf4j-api-1.6.1.jar ...
以下配置执行此操作,并将所有依赖项(包括Scala运行时库)复制到 target / lib
。
The following configuration does that and also copies all the dependencies (including Scala runtime library) to target/lib
.
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>2.3.1</version>
<configuration>
<archive>
<manifest>
<mainClass>com.example.Main</mainClass>
<addClasspath>true</addClasspath>
<classpathLayoutType>custom</classpathLayoutType>
<customClasspathLayout>lib/$${artifact.artifactId}-$${artifact.version}$${dashClassifier?}.$${artifact.extension}
</customClasspathLayout>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.3</version>
<configuration>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
</execution>
</executions>
</plugin>
现在你只需运行你的应用程序(注意 target / lib
目录是必需的):
Now you can simply run your application by (note the target/lib
directory is required):
$ java -jar target/your_app-VERSION.jar
您只需将JAR文件与 / lib $ c一起复制即可运送您的应用程序$ c>子目录。
You can ship your application simply by copying your JAR file along with /lib
subdirectory.
另见 Exec Maven插件和玩Scala和Maven 。
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