CentOS7.X安装Scala2.12.10教程

Leefs 2021-08-16 AM 1069℃ 0条

# CentOS7.X安装Scala2.12.10教程

### 前言

如果需要研究Spark或者Kafka都需要安装Scala环境。

本次安装的Scala版本是2.12.10。

### 一、安装步骤

#### 1.1 下载软件

```
[root@hadoopserver sources]# wget https://downloads.lightbend.com/scala/2.12.10/scala-2.12.10.tgz
```

#### 1.2 拷贝并解压

```
# 将scala安装包拷贝到/usr/local目录下
[root@hadoopserver sources]# cp scala-2.12.10.tgz /usr/local/
# 解压安装包
[root@hadoopserver local]# tar -zxvf scala-2.12.10.tgz
```

#### 1.3 添加环境变量

```
# scala
export SCALA_HOME=/usr/local/scala-2.12.10
export PATH=$PATH:$SCALA_HOME/bin
```

#### 1.4 重新载入资源

```
[root@hadoopserver local]# source /etc/profile
```

#### 1.5 测试

```
[root@hadoopserver local]# scala -version
Scala code runner version 2.12.10 -- Copyright 2002-2019, LAMP/EPFL and Lightbend, Inc.
```

### 二、Scala简单命令

#### 2.1 进入Scala

```
[root@hadoopserver local]# scala
Welcome to Scala 2.12.10 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_241).
Type in expressions for evaluation. Or try :help.

scala> 
```

#### 2.2 查看帮助文档

```
scala> :help
All commands can be abbreviated, e.g., :he instead of :help.
:completions <string>    output completions for the given string
:edit <id>|<line>        edit history
:help [command]          print this summary or command-specific help
:history [num]           show the history (optional num is commands to show)
:h? <string>             search the history
:imports [name name ...] show import history, identifying sources of names
:implicits [-v]          show the implicits in scope
:javap <path|class>      disassemble a file or class name
:line <id>|<line>        place line(s) at the end of history
:load <path>             interpret lines in a file
:paste [-raw] [path]     enter paste mode or paste a file
:power                   enable power user mode
:quit                    exit the interpreter
:replay [options]        reset the repl and replay all previous commands
:require <path>          add a jar to the classpath
:reset [options]         reset the repl to its initial state, forgetting all session entries
:save <path>             save replayable session to a file
:sh <command line>       run a shell command (result is implicitly => List[String])
:settings <options>      update compiler options, if possible; see reset
:silent                  disable/enable automatic printing of results
:type [-v] <expr>        display the type of an expression without evaluating it
:kind [-v] <type>        display the kind of a type. see also :help kind
:warnings                show the suppressed warnings from the most recent line which had any
```

#### 2.3 退出

```
scala> :quit
```

#### 2.4 编译

```
# xxx为Scala文件名称
[root@hadoopserver sources]# scalac xxx.scala
```

#### 2.5 运行

```
# xxx为Scala文件名称
[root@hadoopserver sources]# scala xxx
```

标签: Scala

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