结合书看了http://www.ibm.com/developerworks/cn/web/1103_zhaoct_recommstudy1/index.html?ca=drs-
http://www.ibm.com/developerworks/cn/web/1103_zhaoct_recommstudy2/index.html?ca=drs-
http://www.ibm.com/developerworks/cn/web/1103_zhaoct_recommstudy3/index.html?ca=drs-
