1.打开url下载jdk1.8
2.安装
2.1创建目录
mkdir /usr/local/java/
2.2解压至安装目录
tar -zxvf jdk-8u171-linux-x64.tar.gz -C /usr/local/java/
3.环境变量配置
3.1打开文件
vim /etc/profile
3.2在末尾添加
export JAVA_HOME=/usr/local/java/jdk1.8.0_171
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
3.3使环境变量生效
source /etc/profile
3.4添加软连接
ln -s /usr/local/java/jdk1.8.0_171/bin/java /usr/bin/java
4.查看是否安装成功
java -version