java环境变量
vi/etc/profile.d/java.sh
JAVA_HOME=/root/jdk1.8.0_251
PATH=$JAVA_HOME/bin:/root/apache-maven-3.6.3/bin:$PATH
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
source /etc/profile
vi/etc/profile.d/java.sh
JAVA_HOME=/root/jdk1.8.0_251
PATH=$JAVA_HOME/bin:/root/apache-maven-3.6.3/bin:$PATH
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
source /etc/profile