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java servlet API学习网址:
http://tomcat.apache.org/tomcat-7.0-doc/servletapi/
http://tomcat.apache.org/tomcat-5.5-doc/servletapi/javax/servlet/package-tree.html
servlet入门学习之API
原文地址:http://www.cnblogs.com/haimishasha/p/5611683.html