java-servlet-jsp

=========================servlet
javax.servlet    javax.servlet.http    javax.annotation    javax.servlet.annotaion
一个应用中一个servet只能有一个实例,所有用户共用一个servlet实例
Servlet接口定义5个方法{
    void init(ServletConfig config) throw servletException
    void service(ServletRequest requset,ServetRespone response)throw ServletException
    void destory()
    String getServletInfo()
    servletConfig getServletConfig()
}
service 默认实现转到get/post
ServletRequest.getParameter getParameterMap getParameterNames/Values
ServletResponse.getWriter
一个jvm 中有一个ServletContext{
    get/setAttribute removeAttribute getAttributeNames
}
=========================jsp
javax.servlet.jsp.HttpJspPage
javax.servlet.jsp.tagext
javax.el
javax.servlet.jsp.el
隐藏对象
{
    request/response/out(jsp.JspWriter)/session/application(ServletContext)
    config/pageContext(jsp.PageContext)/page(jsp.HttpJspPage)/exception(Throwable)
}
Directive{ @
    page/include(生成servlet时)/taglib
}
scriptlet <% %>
expression <%=xx%> 结果会填入out.print中
declaration <%! %> 声明变量和方法
action{ <jsp:xx></jsp:xx>
    useBean/include(请求时，扩展名一定要"jsp")/forward
}
=========================EL
${} []或. 访问属性
{
    pageContent/initParam/param/ParamValues/header/headerValues/cookie/applicationScope/sessoinScope
}
=========================jstl
http://search.maven.org/#browse|-1002239620
core/xml/i18n/sql/funtion  c/x/fmt/sql/fn
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
javax.servlet.jsp.tagext.SimpleTagSupport
=========================tag 文件
=========================监听器
在 ServletContext HttpSession ServletRequest 上
=========================filter
登录 加密解密 会话检查 图片转换
作用在 ServletRequest ServletResponse上
javax.servlet.Filter {
    init/doFilter/destory
}
model2
struts1 springmvc use servlet作 front controller
struts2 用filter 作 front controller
javaBean {
    无参contruct
    get/set
    Serializable
}
=========================upload file
entype="multipart/form-data"
@MultipartConfig
=========================down file
Content-Type  : application/octetstream
Content-Dispostion  attachment:finename=xxx
=========================decorator
HttpServletRequest/ResponseWrapper
=========================部署
javax.servlet.ServletContainerInitializer{
    onStartup
}
实现这个接口的类@HandleTypes
META-INF/services