Linux 环境变量的设置与JDK安装

下载解压

#进入目录
mkdir /usr/local/java                                 
cd /usr/local/java   

# 下载
wget https://download.oracle.com/otn-pub/java/jdk/13.0.2+8/d4173c853231432d94f001e99d882ca7/jdk-13.0.2_linux-x64_bin.tar.gz?AuthParam=1581850354_7bf0e17b9f77ddbdfe6f1700b2463198

# 解压
tar -zxvf jdk-13.0.2_linux-x64_bin.tar.gz?AuthParam=1581850354_7bf0e17b9f77ddbdfe6f1700b2463198

# 解压后
jdk-13.0.2

JDK 环境变量

# 添加到系统环境变量： 
# root
vim /etc/profile 
# 非root
vim ~/.bash_profile

# 在文件中加入
export JAVA_HOME=/usr/local/java/jdk-13.0.2
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=$JAVA_HOME/lib/

# 使得环境变量生效： 
source /etc/profile
source ~/.bash_profile

# 验证java是否配置成功： 
java -version
java version "13.0.2" 2020-01-14
Java(TM) SE Runtime Environment (build 13.0.2+8)
Java HotSpot(TM) 64-Bit Server VM (build 13.0.2+8, mixed mode, sharing)