Javaweb三大组件
Servlet
ServletContext
传递域数据
setAttribute/getAttibute/getAttributeNames/removeAttibute
获取web应用资源
getResource/getResourcePaths/getResourceAsStream/getRealPath
getInitParameter/getInitParameterNames
Servlet
创建方式：实现Servlet/继承GenericServlet/继承HttpServlet
生命周期init/service/destroy
getServletConfig/getServletInfo
servlet配置：url-pattern4种方式：全匹配/，目录匹配/，扩展名匹配，缺省/
ServletConfig
getInitParameter/getInitParameterNames
getServletName/getServletContext
ServletRequest
传递域数据：
setAttribute/getAttibute/getAttributeNames/removeAttibute
HTTP封装
请求行：
请求头：setCharacterEncoding
请求体：getParameter/getParameterValues/getParameterMap
getInputStream/getReader
内部转发
getRequestDisptcher.forward
ServletResponse
HTTP封装
响应行：sentStatus/sendError
响应头：addHeader/setHeader/addIntHeader/setIntHeader/SetContentLength
/SetContentType/setLocale/setCharacterEncoding/sendRedirect
响应体：getOutputStream/getWritter
jsp
jsp脚本与注释 jsp scriptlets代码段/jsp声明语句/jsp表达式
jsp指令 page/include/taglib
jsp动作元素 jsp:include/forward
内置对象9与作用域 4
page/config/application/request/response/session/out/exception/pageContext/
appliction/session/request/pageContext
EL和JSTL
Listener
Filter