Linux JDK环境变量的配置

vim /etc/profile
#set jdk env
export JAVA_HOME=/opt/jdk8
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JAVA_HOME}/jre/lib
export PATH=${JAVA_HOME}/bin:$PATH

最后刷新profile 使之生效
source /etc/profile