全局配置文件:/ etc /profile
exportJAVA_HOME=/usr/local/java/jdk1.8.0_71
exportPATH=$JAVA_HOME/bin:$PATH
exportMAVEN_HOME=/usr/local/maven/apache-maven-3.5.0
exportPATH=$MAVEN_HOME/bin:$PATH
exportCLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar
如下图: