sparkSession使用：

package com.jdjr.city.demo

import org.apache.spark.sql.SparkSession

/**
  * @Auther: hongwei
  * @Date: 2018/11/9 16:31
  * @Description: SparkSession使用
  */
object Test4 {
  def main(args: Array[String]): Unit = {
    val spark = SparkSession
      .builder()
      .appName("ActionOperation")
      .master("local")
      .getOrCreate()
    spark.sparkContext.setLogLevel("WARN")
    import spark.implicits._

    val employee = spark.read.json("D:\\jdWork\\code\\MySpark\\src\\main\\resources\\1.txt")

    // collect：將分散式儲存在叢集上的分散式資料集（比如dataset）中的所有資料都獲取到driver端來
    employee.collect().foreach {
      println(_)
    }
    // count：對dataset中的記錄數進行統計個數的操作
    println(employee.count())
    // first：獲取資料集中的第一條資料
    println(employee.first())
    // foreach：遍歷資料集中的每一條資料，對資料進行操作，這個跟collect不同，collect是將資料獲取到driver端進行操作
    // foreach是將計算操作推到叢集上去分散式執行
    // foreach(println(_))這種，真正在叢集中執行的時候，是沒用的，因為輸出的結果是在分散式的叢集中的，我們是看不到的
    employee.foreach {
      println(_)
    }
    // reduce：對資料集中的所有資料進行歸約的操作，多條變成一條
    // 用reduce來實現資料集的個數的統計
    //println(employee.map(employee => 1).reduce(_ + _))
    // show，預設將dataset資料列印前20條
    employee.show()
    // take，從資料集中獲取指定條數
    employee.take(3).foreach {
      println(_)
    }
  }
}
 

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.jdjr.city</groupId>
    <artifactId>MySpark</artifactId>
    <version>1.0-SNAPSHOT</version>

    <repositories>
        <repository>
            <id>cloudera</id>
            <url>https://repository.cloudera.com/artifactory/cloudera-repos/</url>
        </repository>
    </repositories>

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <encoding>UTF-8</encoding>
        <scala.version>2.11.8</scala.version>
        <spark.version>2.2.0</spark.version>
        <hadoop.version>2.6.4</hadoop.version>
    </properties>

    <dependencies>
        <!--<dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-library</artifactId>
            <version>${scala.version}</version>
        </dependency>-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.8</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.5</version>
        </dependency>

        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.8.3</version>
        </dependency>

        <dependency>
            <groupId>org.ansj</groupId>
            <artifactId>ansj_seg</artifactId>
            <version>5.0.4</version>
        </dependency>

        <dependency>
            <groupId>com.geccocrawler</groupId>
            <artifactId>gecco</artifactId>
            <version>1.0.8</version>
        </dependency>

        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-core_2.11</artifactId>
            <version>${spark.version}</version>
        </dependency>

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

        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-client</artifactId>
            <version>${hadoop.version}</version>
        </dependency>
    </dependencies>

    <build>
        <sourceDirectory>src/main/scala</sourceDirectory>
        <testSourceDirectory>src/test/scala</testSourceDirectory>
        <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>
                        <configuration>
                            <args>
                                <!--scala 2.11不支援-->
                                <!-- <arg>-make:transitive</arg>-->
                                <arg>-dependencyfile</arg>
                                <arg>${project.build.directory}/.scala_dependencies</arg>
                            </args>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>2.4.3</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <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>com.jdjr.city.demo.SearchPoi2</mainClass>
                                </transformer>
                            </transformers>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>