Ubuntu 16.04 安装配置 JDK 8

下载

wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" download.oracle.com/otn-pub/java/jdk/8u152-b16/aa0333dd3019491ca4f6ddbe78cdb6d0/jdk-8u152-linux-x64.tar.gz

创建目录

mkdir /usr/lib/java

解压缩到该目录

tar -zxvf jdk-8u152-linux-x64.tar.gz -C /usr/lib/java

修改环境变量

vim ~/.bashrc

#set jdk environment
export JAVA_HOME=/usr/lib/java/jdk1.8.0_152
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

环境变量生效

source ~/.bashrc

设置系统默认 jdk 版本

sudo update-alternatives --install /usr/bin/java java /usr/lib/java/jdk1.8.0_152/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/java/jdk1.8.0_152/bin/javac 300
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/java/jdk1.8.0_152/bin/jar 300
sudo update-alternatives --install /usr/bin/javah javah /usr/lib/java/jdk1.8.0_152/bin/javah 300
sudo update-alternatives --install /usr/bin/javap javap /usr/lib/java/jdk1.8.0_152/bin/javap 300

sudo update-alternatives --config java