在IDEA中启动spark项目的操作

第一步:
在pom文件中
换成

<properties>
    <scala.version>2.12.12</scala.version>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <encoding>UTF-8</encoding>
    <spark.version>3.0.1</spark.version>
  </properties>

<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.apache.spark</groupId>
      <artifactId>spark-core_2.12</artifactId>
      <version>3.0.1</version>
    </dependency>

    <dependency>
      <groupId>org.apache.spark</groupId>
      <artifactId>spark-sql_2.12</artifactId>
      <version>3.0.1</version>
<!--      <scope>provided</scope>-->
    </dependency>

<!--    <dependency>-->
<!--      <groupId>org.apache.spark</groupId>-->
<!--      <artifactId>spark-sql_2.11</artifactId>-->
<!--      <version>${spark.version}</version>-->
<!--      <scope>provided</scope>-->
<!--    </dependency>-->


    <dependency>
      <groupId>org.scalanlp</groupId>
      <artifactId>breeze_2.12</artifactId>
      <version>1.1</version>
    </dependency>

    <dependency>
      <groupId>org.apache.hadoop</groupId>
      <artifactId>hadoop-client</artifactId>
      <version>2.7.4</version>
    </dependency>
    <dependency>
      <groupId>org.apache.hbase</groupId>
      <artifactId>hbase-client</artifactId>
      <version>1.3.1</version>
    </dependency>
    <dependency>
      <groupId>org.apache.hbase</groupId>
      <artifactId>hbase-server</artifactId>
      <version>1.3.1</version>
    </dependency>
    <dependency>
      <groupId>com.typesafe</groupId>
      <artifactId>config</artifactId>
      <version>1.3.3</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.38</version>
    </dependency>

    <dependency>
      <groupId>org.apache.spark</groupId>
      <artifactId>spark-mllib_2.12</artifactId>
      <version>3.0.1</version>
<!--      <scope>provided</scope>-->
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.apache.spark/spark-streaming -->
    <dependency>
      <groupId>org.apache.spark</groupId>
      <artifactId>spark-streaming_2.12</artifactId>
      <version>3.0.1</version>
<!--      <scope>provided</scope>-->
    </dependency>


    <dependency>
      <groupId>com.github.scopt</groupId>
      <artifactId>scopt_2.12</artifactId>
      <version>3.5.0</version>
    </dependency>

然后App改内容
/**

• Hello world!

*/
object Main extends App {
println( “Hello World!” )
}

最后添加配置
先这样

然后这样

接着这样