View environment variables Classpath, PATH, Java_home-------->mac

Terminal (command line) operation

Two posts recommended: http://elf8848.iteye.com/blog/1582137

http://blog.csdn.net/done58/article/details/51138057

View java_home Command->set | grep JAVA

Add Java_home:export java_home=$ (/usr/libexec/java_home)

View the PATH command->echo $PATH

Add PATH export Path=/users/snowing/downloads/apache-maven-3.5.0/bin: $PATH

View CLASSPATH: command->set | more

Add $export Classpath=${classpath}:/users/snowing/downloads/apache-tomcat-9.0.0.m18/lib/servlet-api.jar

MAC Modify Host File

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sudo vi/etc/hosts

View environment variables Classpath, PATH, Java_home-------->mac