http://bobao.360.cn/learning/detail/3841.html
http://www.freebuf.com/articles/web/97833.html
http://www.freebuf.com/articles/web/126788.html
http://www.freebuf.com/column/146306.html
XXE攻防技术
原文：http://www.cnblogs.com/blacksunny/p/7490979.html
