vi ~/.bash_profile


export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home #jdk安装路径     
export PATH=$JAVA_HOME/bin:$PATH   
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar


:wq 保存后退出
更新配置文件 source ~/.bash_profile，完成


M2_HOME=/softWare/IT/iT_maven/apache-maven-3.3.9
PATH=$M2_HOME/bin:$PATH
export M2_HOME
export PATH



export PATH=$PATH:/softWare/IT/iT_tomcat9/apache-tomcat-9.0.0.M26/bin/