Ubuntu20.04服务器(Linux/window)安装Ja

Ubuntu 安装Java环境，配置环境变量

jdk官网下载地址

https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

解压

tar -zxvf jdk-8u191-linux-x64.tar.gz -C ~/app/

添加环境变量

sudo vim ~/.bashrc

# JAVA

export JAVA_HOME=/home/hadoop/app/jdk1.8.0_191

export PATH=$JAVA_HOME/bin:$PATH

配置生效

source ~/.bashrc

检查安装

# 依次验证 java javac
java

javac

# 若想查看当前 jdk版本
java -version

window下安装jdk配置

JAVA_HOME

C:\Program Files\Java\jdk1.8.0_192

CLASSPATH

.;%JAVA_HOME%\lib;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\tools.jar

Path (window 7)

;%JAVA_HOME%\bin

验证环境变量配置

Path (window 10)

%JAVA_HOME%\bin