mac下安装maven
Maven在Mac平台安
如果有安XCode, XCode自你安Maven, 安在/usr/share/java/
(本人就是这种情况，折腾了半天发现本来maven已经安装好了)

下面的是抄别人的日志备用
安3.0.3
1到http://maven.apache.org/download.html下maven 3.0.3
2apache-maven-3.0.3-bin.tar.gz解到/usr/share/java
3移除/usr/share下的softlink maven
4ln -s /usr/share/java/apache-maven-3.0.3 /usr/share/maven
5修改~/.profile 定M3_HOME=/usr/share/java/apache-maven-3.0.3

注意事
不能同M2_HOMEM3_HOME境, 不然行maven出以下的exception

Exception in thread "main" java.lang.NoClassDefFoundError: org/codehaus/plexus/classworlds/launcher/Launcher Caused by: java.lang.ClassNotFoundException: org.codehaus.plexus.classworlds.launcher.Launcher at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248)