1.下载jdk tar

2.解压到/usr/lib/jvm/jdk1.8

3.设置环境变量

vi ~/.bashrc

export JAVA_HOME=/usr/lib/jvm/jdk1.8
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib

4.安装验证

java -version

linux 安装jdk