export JAVA_HOME=/usr/java/jdk1.8.0_74
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
M2_HOME=/usr/java/apache-maven-3.5.0
export M2_HOME
PATH=$PATH:$M2_HOME/bin
export PATH
原文：http://www.cnblogs.com/justuntil/p/7707391.html