[大数据]jdk、scala (阿里云CentOS7.2) 安装过程记录

JDK

mkdir /usr/java
cd /usr/java

rz  从windows上传jdk压缩包 到 /usr/java

unzip jdk1.8___.zip

查看解压后jdk文件夹的权限，如果不是root需要设置为root
chown -R root:root /usr/java/*

配置JAVA_HOME到环境变量

vi /etc/profile

export JAVA_HOME=/usr/java/jdk1.8.0_121
export PATH=$JAVA_HOME/bin:$PATH

[root@Gargantua java]# source /etc/profile
[root@Gargantua java]# which java
/usr/java/jdk1.8.0_121/bin/java
[root@Gargantua java]# echo $PATH
/usr/java/jdk1.8.0_121/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin

安装完成

scala

cd /home/hadoop

[hadoop@localhost ~]$ mkdir -p software source data app script lib

[hadoop@localhost ~]$ cd software/

[hadoop@localhost software]$ rz
[hadoop@localhost software]$ tar -zxvf scala-2.12.14.tgz -C ~/app/

[hadoop@localhost software]$ cd ~/app

[hadoop@localhost app]$ ln -s scala-2.12.14/ scala

[hadoop@localhost app]$ vi ~/.bashrc

export SCALA_HOME=/home/hadoop/app/scala
export PATH=$PATH:$SCALA_HOME/bin

[hadoop@localhost ~]$ which scala

~/app/scala/bin/scala

[hadoop@localhost ~]$ scala

scala> print("Hello word!")
Hello word!

windows 安装scala，和安装jdk一样，并在高级系统设置里添加 SCALA_HOME 和 path。
IDEA集成java项目与scala:

• 需要在Plugins里下载scala插件

• 在项目名上右键 Add Framework support，找到scala并勾选

• 项目里创建sacla文件夹，与java文件夹平级，右键scala文件夹，Mark Directory As --Source Root

    <dependency>
        <groupId>org.scala-lang</groupId>
        <artifactId>scala-library</artifactId>
        <version>2.12.14</version>
    </dependency>