Idea无法创建scala.class的解决方法

面临的问题

在学习scala编程的时候，跟着课程的步骤进行练习，可是右键点击new的时候，没有出现scala.class，下面是关于本人对于此问题的解决步骤

1：pom.xml

因为用的是maven，所以最初的想法是，会不会是我依赖包导错了，于是去检查了Maven Projects：

看不出个所以然，所以干脆去github上面拷贝了一段依赖下来:

<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>scala</groupId>
 <artifactId>scala-train</artifactId>
 <version>1.0-SNAPSHOT</version>
 <inceptionYear>2008</inceptionYear>
 <properties>
   <maven.compiler.source>1.8</maven.compiler.source>
   <maven.compiler.target>1.8</maven.compiler.target>
   <encoding>UTF-8</encoding>
   <spark.version>2.1.1</spark.version>
   <scala.version>2.11.8</scala.version>
   <scala.compat.version>2.11</scala.compat.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>
   <!-- Scala lang, spark core and spark sql are all
        scoped as provided as spark-submit will provide these -->
   <dependency>
     <groupId>org.scala-lang</groupId>
     <artifactId>scala-library</artifactId>
     <version>${scala.version}</version>
     <scope>provided</scope>
   </dependency>
   <dependency>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-core_${scala.compat.version}</artifactId>
     <version>${spark.version}</version>
     <scope>provided</scope>
   </dependency>
   <dependency>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-sql_${scala.compat.version}</artifactId>
     <version>${spark.version}</version>
     <scope>provided</scope>
   </dependency>
   <dependency>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-api</artifactId>
     <version>1.7.5</version>
   </dependency>
   <dependency>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-log4j12</artifactId>
     <version>1.7.25</version>
   </dependency>
   <dependency>
     <groupId>org.clapper</groupId>
     <artifactId>grizzled-slf4j_${scala.compat.version}</artifactId>
     <version>1.3.1</version>
   </dependency>
   <dependency>
     <groupId>com.typesafe</groupId>
     <artifactId>config</artifactId>
     <version>1.3.2</version>
   </dependency>
   <!-- Test Scopes -->
   <dependency>
     <groupId>org.scalactic</groupId>
     <artifactId>scalactic_${scala.compat.version}</artifactId>
     <version>3.0.5</version>
   </dependency>
   <dependency>
     <groupId>org.scalatest</groupId>
     <artifactId>scalatest_${scala.compat.version}</artifactId>
     <version>3.0.5</version>
     <scope>test</scope>
   </dependency>
 </dependencies>
 <build>
   <sourceDirectory>src/main/scala</sourceDirectory>
   <testSourceDirectory>src/test/scala</testSourceDirectory>
   <plugins>
     <plugin>
       <!-- see http://davidb.github.com/scala-maven-plugin -->
       <groupId>net.alchim31.maven</groupId>
       <artifactId>scala-maven-plugin</artifactId>
       <version>3.3.1</version>
       <configuration>
         <compilerPlugins>
           <compilerPlugin>
             <groupId>com.artima.supersafe</groupId>
             <artifactId>supersafe_${scala.version}</artifactId>
             <version>1.1.3</version>
           </compilerPlugin>
         </compilerPlugins>
       </configuration>
       <executions>
         <execution>
           <goals>
             <goal>compile</goal>
             <goal>testCompile</goal>
           </goals>
           <configuration>
             <args>
               <arg>-feature</arg>
               <arg>-deprecation</arg>
               <arg>-dependencyfile</arg>
               <arg>${project.build.directory}/.scala_dependencies</arg>
             </args>
           </configuration>
         </execution>
       </executions>
     </plugin>
     <!-- disable surefire -->
     <plugin>
       <groupId>org.apache.maven.plugins</groupId>
       <artifactId>maven-surefire-plugin</artifactId>
       <version>2.18.1</version>
       <configuration>
         <skipTests>true</skipTests>
         <useFile>false</useFile>
         <disableXmlReport>true</disableXmlReport>
         <includes>
           <include>**/*Test.*
           **/*Suite.*</include>
         </includes>
       </configuration>
     </plugin>
     <plugin>
       <groupId>org.codehaus.mojo</groupId>
       <artifactId>exec-maven-plugin</artifactId>
       <version>1.5.0</version>
       <executions>
         <execution>
           <id>run-local</id>
           <goals>
             <goal>exec</goal>
           </goals>
           <configuration>
             <executable>spark-submit</executable>
             <arguments>
               <argument>--master</argument>
               <argument>local</argument>
               <argument>${project.build.directory}/${project.artifactId}-${project.version}.jar
               </argument>
             </arguments>
           </configuration>
         </execution>
         <execution>
           <id>run-yarn</id>
           <goals>
             <goal>exec</goal>
           </goals>
           <configuration>
             <environmentVariables>
               <HADOOP_CONF_DIR>
                 ${basedir}/spark-remote/conf
               </HADOOP_CONF_DIR>
             </environmentVariables>
             <executable>spark-submit</executable>
             <arguments>
               <argument>--master</argument>
               <argument>yarn</argument>
               <argument>${project.build.directory}/${project.artifactId}-${project.version}.jar
               </argument>
             </arguments>
           </configuration>
         </execution>
       </executions>
     </plugin>
     <!-- Use the shade plugin to remove all the provided artifacts (such as spark itself) from the jar -->
     <plugin>
       <groupId>org.apache.maven.plugins</groupId>
       <artifactId>maven-shade-plugin</artifactId>
       <version>3.1.1</version>
       <configuration>
         <!-- Remove signed keys to prevent security exceptions on uber jar -->
         <!-- See https://stackoverflow.com/a/6743609/7245239 -->
         <filters>
           <filter>
             <artifact>*:*</artifact>
             <excludes>
               <exclude>META-INF\/*.SF</exclude>
               <exclude>META-INF\/*.DSA</exclude>
               <exclude>META-INF\/*.RSA</exclude>
             </excludes>
           </filter>
         </filters>
         <transformers>
           <transformer
                   implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
             <mainClass>net.martinprobson.spark.SparkTest</mainClass>
           </transformer>
         </transformers>
         <artifactSet>
           <excludes>
             <exclude>javax.servlet:*</exclude>
             <exclude>org.apache.hadoop:*</exclude>
             <exclude>org.apache.maven.plugins:*</exclude>
             <exclude>org.apache.spark:*</exclude>
             <exclude>org.apache.avro:*</exclude>
             <exclude>org.apache.parquet:*</exclude>
             <exclude>org.scala-lang:*</exclude>
           </excludes>
         </artifactSet>
       </configuration>
       <executions>
         <execution>
           <phase>package</phase>
           <goals>
             <goal>shade</goal>
           </goals>
         </execution>
       </executions>
     </plugin>
   </plugins>
 </build>
</project>

可是依然出现如图的情况：

2：scala在windows的安装

由于之前一直用的虚拟机跑，所以并未在本机上安装scala，所以不知道会不会是这个原因，于是重新去官网上下载了scala-2.11.8的windows版本，具体的安装过程在此网站https://www.cnblogs.com/freeweb/p/5623372.html，但是发现问题仍旧没有解决。

3：Global Libraries

无奈，只能上网查找，发现是没有添加scala sdk，具体如图：

点击加号，却没有scala sdk

去setting->Plugins->install JetBrains plugin搜索Scala ，选中Scala，点击右侧Install, 即进入在线安装。

重启Idea后，发现原来的scala类已经可以用了
但为了防止意外，还是先引入Scala SDK

点击Apply使其生效，接下来就可以愉快地进行scala编程啦~！！！！
由于这是本人第一次编写csdn博客，可能写的会很粗糙，还请各位看官见谅~~