jdk linux

export JAVA_HOME=/usr/java/jdk1.8.0_221-amd64
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JRE_HOME/lib:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME/bin:$PATH

　　

[root@iZbp1davrpkdfc7ms990k0Z ~]# vim /etc/profile
[root@iZbp1davrpkdfc7ms990k0Z ~]# 添加上面的代码
[root@iZbp1davrpkdfc7ms990k0Z ~]# source /etc/profile
[root@iZbp1davrpkdfc7ms990k0Z ~]#