1. 下载JDK
    [root@VM-20-12-centos data]# wget http://data.nidayed.net/jdk-8u321-linux-x64.tar.gz
    [root@VM-20-12-centos data]# tar -zxvf jdk-8u321-linux-x64.tar.gz
    [root@VM-20-12-centos data]# rm -rf jdk-8u321-linux-x64.tar.gz
  2. 配置环境变量
    [root@VM-20-12-centos data]# vim /etc/profile
    export JAVA_HOME=/data/jdk1.8.0_321
    export JAVA_BIN=$JAVA_HOME/bin
    export PATH=$PATH:$JAVA_BIN
    export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
    export JAVA_HOME JAVA_BIN PATH CLASSPATH
    [root@VM-20-12-centos data]# source /etc/profile
  3. 验证
    [root@VM-20-12-centos data]# java -version
    java version "1.8.0_321"
    Java(TM) SE Runtime Environment (build 1.8.0_321-b07)
    Java HotSpot(TM) 64-Bit Server VM (build 25.321-b07, mixed mode)