上传JDK并解压

  1. 上传JDK压缩包到/usr/local目录: jdk1.8.0_144.tar.gz
  2. 解压文件:

    1. tar -xvf jdk1.8.0_144.tar.gz
  3. 解压成功即可

配置环境变量

  1. 修改profile文件:vi /etc/profile
  2. 添加配置信息

    export JAVA_HOME=/usr/local/jdk1.8.0_144
    export JRE_HOME=/usr/local/jdk1.8.0_144/jre
    export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib:$CLASSPATH
    export PATH=$JAVA_HOME/bin:$PATH
    
  3. 测试配置:java -version

    [root@hadoop101 ~]# java -version
    java version "1.8.0_144"
    Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
    Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)