两个常用maven repository 地址:
http://search.maven.org/
http://mvnrepository.com/
google 地址:
http://74.125.224.18/
http://74.125.20.31/
http://g.ttlsa.com/?gws_rd=ssl
https://edgecastcdn.net/00107ED/g/
java jvm 好文章地址:
http://blog.csdn.net/csh624366188/article/details/7937144