1.网站收集：
http://tutorials.jenkov.com/java-servlets/web-xml.html
监听器：
http://www.itzhai.com/java-web-notes-servlet-listener-listener-in-the-listener-interface-commonly-used-in-listener.html
URL映射：
http://blog.csdn.net/tuxq5721/article/details/17892385
1.网站收集：
http://tutorials.jenkov.com/java-servlets/web-xml.html
监听器：
http://www.itzhai.com/java-web-notes-servlet-listener-listener-in-the-listener-interface-commonly-used-in-listener.html
URL映射：
http://blog.csdn.net/tuxq5721/article/details/17892385