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http://josh-persistence.iteye.com/blog/1880572

http://www.iteye.com/topic/681623

http://denyx123.iteye.com/blog/1122157

http://zhxing.iteye.com/blog/543584

http://gaojianqi6.iteye.com/blog/1336626

http://gaolixu.iteye.com/blog/393477