1.进入命令行状态 windows 电脑 方法一： 在系统桌面左下侧搜索栏输入CMD或者命令提示符，右键点击命令提示符在右键菜单中点击：以管理员身份运行，可以打开系统【管理员命令提示符】窗口。

苹果电脑: 打开终端 在 Mac 上打开 Finder 窗口，然后在「应用程序」目录中直接搜索“终端”关键字，也可以搜索到；

2.在命令行窗口输入,然后回车 java -version,确认你的java 环境是java8,如果不是请切换到java8 $ java -version java version “11” 2018-09-25 Java™ SE Runtime Environment 18.9 (build 11+28) Java HotSpot™ 64-Bit Server VM 18.9 (build 11+28, mixed mode) 我的是Java11 和java8的同时安装的。

切换后变成: java version “1.8.0_181” Java™ SE Runtime Environment (build 1.8.0_181-b13) Java HotSpot™ 64-Bit Server VM (build 25.181-b13, mixed mode)

$ which java #可以查看Java 所在目录 /Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/bin/java

纯文字输出如下: 2018-11-21 05:42:19 WARN NativeCodeLoader:62 - Unable to load native-hadoop library for your platform… using builtin-java classes where applicable Setting default log level to “WARN”. To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel). 2018-11-21 05:42:25 WARN Utils:66 - Service ‘SparkUI’ could not bind on port 4040. Attempting port 4041. Spark context Web UI available at http://192.168.5.105:4041 Spark context available as ‘sc’ (master = local[*], app id = local-1542750145331). Spark session available as ‘spark’. Welcome to ____ __ / / ___ / / \ / _ / _ `/ __/ '/ // .__/_,// //_\ version 2.4.0 //

Using Scala version 2.11.12 (Java HotSpot™ 64-Bit Server VM, Java 1.8.0_181) Type in expressions to have them evaluated. Type :help for more information.