ubuntu 16.04 JDK 安装及环境变量配置

1.创建目录

sudo mkdir /usr/lib/jdk

2 .解压

sudo tar -zxvf jdk-17_linux-x64_bin.tar.gz -C /usr/lib/jdk

3.修改环境变量

sudo gedit ~/.bashrc

#set oracle jdk environment
export JAVA_HOME=/usr/lib/jdk/jdk-17.0.1  ## 这里要注意目录要换成自己解压的jdk目录
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

4.配置软链接（未配置软链接su下常常找不到java命令）

sudo ln -s  /usr/lib/jdk/jdk-17.0.1/bin/java /usr/bin/java
sudo ln -s  /usr/lib/jdk/jdk-17.0.1/bin/javac /usr/bin/javac

5.环境生效. 

source ~/.bashrc