六祎-12：centos7配置jdk环境

#java environment
export JAVA_HOME="/usr/java/jdk1.8.0_201" //安装的路径换成你安装jdk的路径即可！
export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar
export PATH=$PATH:${JAVA_HOME}/bin