mac os x 装jdk,xcode,macports

http://carlme.blog.163.com/blog/static/18371632720126310295080/

http://www.cnblogs.com/highriver/archive/2012/07/23/2605453.html

http://blog.csdn.net/favormm/article/details/7704018

http://koda.iteye.com/blog/1608041

http://blog.shengbin.me/posts/macports-or-homebrew/