JDK环境变量设置
export JAVA_HOME=/usr/lib/jvm/jdk-11.0.19 export JRE_HOME=/usr/lib/jvm/jdk-11.0.19/jre export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:/bin:/usr/bin:$PATH