先收集，后续再实践。
http://blog.csdn.net/dreamcode/article/details/44307377
http://blog.csdn.net/lanonola/article/details/51513343
http://www.cnblogs.com/zhongshiqiang/p/5968768.html
http://blog.csdn.net/wutian713/article/details/51452237
http://www.dataguru.cn/thread-593835-1-1.html