使用maven构建scala项目

前提

idea中已安装了Scala插件
本地已安装了maven

方式1

• idea使用maven构建scala项目，点击New Project
  

• 填写项目名称
  

• 选择maven目录
  

• idea配置的本地scala，File -> Project Structure -> Global Libraries
  

• 本地安装的Scala版本需高于idea的版本

• idea默认的Scala版本是2.7.0，修改pom.xml

<properties>
  <scala.version>2.11.12</scala.version>
</properties>

• 删除test/scala目录下的MySpec文件
• Scala2.9以后就弃用了Application，使用2.11版本要用App替代Application

object test1 extends App {
  println( "Hello World!" )

}

• 写法2

object App {
  def main(args: Array[String]): Unit = {
    println( "Hello World!" )
  }
}

• 修改pom.xml

# 设置字符编码
<properties>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <scala.version>2.11.12</scala.version>
</properties>

# 添加依赖
<dependency>
  <groupId>org.scala-tools</groupId>
  <artifactId>maven-scala-plugin</artifactId>
  <version>2.11</version>
</dependency>
<dependency>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-eclipse-plugin</artifactId>
  <version>2.5.1</version>
</dependency>

• 完整pom文件

点击查看详情

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.example</groupId>
  <artifactId>demo1</artifactId>
  <version>1.0-SNAPSHOT</version>
  <inceptionYear>2008</inceptionYear>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <scala.version>2.11.12</scala.version>
  </properties>

  <repositories>
    <repository>
      <id>scala-tools.org</id>
      <name>Scala-Tools Maven2 Repository</name>
      <url>http://scala-tools.org/repo-releases</url>
    </repository>
  </repositories>

  <pluginRepositories>
    <pluginRepository>
      <id>scala-tools.org</id>
      <name>Scala-Tools Maven2 Repository</name>
      <url>http://scala-tools.org/repo-releases</url>
    </pluginRepository>
  </pluginRepositories>

  <dependencies>
    <dependency>
      <groupId>org.scala-lang</groupId>
      <artifactId>scala-library</artifactId>
      <version>${scala.version}</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.4</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.specs</groupId>
      <artifactId>specs</artifactId>
      <version>1.2.5</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.scala-tools</groupId>
      <artifactId>maven-scala-plugin</artifactId>
      <version>2.11</version>
    </dependency>
    <dependency>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-eclipse-plugin</artifactId>
      <version>2.5.1</version>
    </dependency>
  </dependencies>

  <build>
    <sourceDirectory>src/main/scala</sourceDirectory>
    <testSourceDirectory>src/test/scala</testSourceDirectory>
    <plugins>
      <plugin>
        <groupId>org.scala-tools</groupId>
        <artifactId>maven-scala-plugin</artifactId>
        <executions>
          <execution>
            <goals>
              <goal>compile</goal>
              <goal>testCompile</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
          <scalaVersion>${scala.version}</scalaVersion>
          <args>
            <arg>-target:jvm-1.5</arg>
          </args>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-eclipse-plugin</artifactId>
        <configuration>
          <downloadSources>true</downloadSources>
          <buildcommands>
            <buildcommand>ch.epfl.lamp.sdt.core.scalabuilder</buildcommand>
          </buildcommands>
          <additionalProjectnatures>
            <projectnature>ch.epfl.lamp.sdt.core.scalanature</projectnature>
          </additionalProjectnatures>
          <classpathContainers>
            <classpathContainer>org.eclipse.jdt.launching.JRE_CONTAINER</classpathContainer>
            <classpathContainer>ch.epfl.lamp.sdt.launching.SCALA_CONTAINER</classpathContainer>
          </classpathContainers>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <reporting>
    <plugins>
      <plugin>
        <groupId>org.scala-tools</groupId>
        <artifactId>maven-scala-plugin</artifactId>
        <configuration>
          <scalaVersion>${scala.version}</scalaVersion>
        </configuration>
      </plugin>
    </plugins>
  </reporting>
</project>

方式2

• 使用maven命令构建Scala项目
• 打开cmd，执行如下命令，DartifactId表示项目的名称

mvn archetype:generate -DgroupId=com.example -DartifactId=demo2 -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

• 修改pom.xml

<build>
    <plugins>
        <plugin>
            <groupId>net.alchim31.maven</groupId>
            <artifactId>scala-maven-plugin</artifactId>
            <version>3.2.2</version>
            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>testCompile</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

• 将java改为scala
  

• 右键项目，点击Add Framework Support...，添加Scala框架支持
  

• New -> Scala Class -> 填写类名，选择Object

package com.example
object test1 {
  def main(args: Array[String]): Unit = {
    println("hello scala")
  }
}

小结

• Scala是依赖jvm运行的，如果报错java: 错误: 不支持发行版本 5，需修改jdk的配置

Setting –> Build,Execution… –> Compiler —> java Compiler
File —> Project Structure