Java和maven环境变量配置：

1.打开终端：输入命令：vi ~/.bash_profile

2.再输入 i 进入编辑模式

输入以下：

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home

export M2_HOME=/Users/hang/Library/apache-maven-3.2.5

export PATH=$PATH:$M2_HOME/bin

CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

PATH=$JAVA_HOME/bin:$PATH:

export JAVA_HOME

export CLASSPATH

export PATH

3.按esc 再输入 wq！保存退出编辑。

4.输入 source ~/.bash_profile 保存

5.输入 echo $JAVA_HOME 查看路径

/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home

6. 输入mvn -v 查看 maven

Apache Maven 3.2.5 (12a6b3acb947671f09b81f49094c53f426d8cea1; 2014-12-15T01:29:23+08:00)

Maven home: /Users/hang/Library/apache-maven-3.2.5

Java version: 1.8.0_201, vendor: Oracle Corporation

Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre

Default locale: zh_CN, platform encoding: UTF-8

OS name: "mac os x", version: "10.14.3", arch: "x86_64", family: "mac"