linux 7 jdk 配置全局环境变量

export JAVA_HOME=/usr/local/jdk1.8.0_261
export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar
export PATH=$PATH:${JAVA_HOME}/bin

source /etc/profile  加载环境变量