一、官网下载MAC版本的JDK，这里用的jdk版本是 1.7，得到jdk-7u79-macosx-x64.dmg，双击直接默认安装，默认安装路径是
/Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk
二、下载Maven，这里用的Maven版本是3.0.5，放到指定目录，我的目录是/Users/longwnetao/java/apache-maven-3.0.5
三、在用户根目录下，输入如下命令编辑.bash_profile文件
cd ~
vi .bash_profile(文件不存在则新建)
在文件中输入以下内容
#JDK安装目录，一定要指定到Contents/Home
JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home"
#Maven存放路径
MAVEN_HOME="/Users/longwentao/java/apache-maven-3.0.5"
export MAVEN_HOME
export JAVA_HOME
export PATH=${PATH}:${MAVEN_HOME}/bin:${JAVA_HOME}/bin
按esc键退出编辑模式，输入wq保存退出编辑
输入source .bash_profile命令，使.bash_profile文件生效
输入java -version命令，验证JDK的安装结果，出现如下结果，证明安装成功
longwentaodeMacBook-Pro:java longwentao$ java -version
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)
输入man -v命令，验证Maven安装结果，出现如下结果，证明安装成功
longwentaodeMacBook-Pro:java longwentao$ mvn -v
Apache Maven 3.0.5 (r01de14724cdef164cd33c7c8c2fe155faf9602da; 2013-02-19 21:51:28+0800)
Maven home: /Users/longwentao/java/apache-maven-3.0.5
Java version: 1.7.0_79, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home/jre
Default locale: zh_CN, platform encoding: UTF-8
OS name: "mac os x", version: "10.11.6", arch: "x86_64", family: "mac"