jsp 3指令 7动作 9对象

指令 7动作 9对象

3指令

page

include

taglib

7动作

include

forward

useBean

setProperty

getProperty

parm

pugin

9对象

application	javax.servlet.ServletContext	getAttribute serAttribute getInitParameter
session	javax.servlet.http.HttpSession	getAttribute serAttribute
config	javax.servlet.ServletConfig	getInitParameters getInitParameter
page	javax.servlet.Servlet本身
pageContext	javax.servlet.jsp.PageContext	getServletContext getServletConfig getSession getOut
request	javax.servlet.http.HttpServletRequest	getAttribute serAttribute getParameter getParameterMap getParameterNames getParameterValues setCharactorEncoding getCookies
response	javax.servlet.http.HttpServletResponse	sendRedirect getOutputStream setCookie
out	javax.servlet.jsp,JspWriter
exception	Throwable	getMessage getStrackTrace

往往在servlet里这样得到：

HttpServletRequest HttpServletResponse 为参数

先用某种方法得到pageContext

然后

pageContext.getServletConfig

pageContext.getServletContext (或者可以servletConfig.getServletContext())

pageContext.getSession 

pageContext.getOut

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另外

1 web.xml下配置<context-param>，可以让context读到、

2 pageContext.getAttribute(String name,int scope) 可从pageContext.PAGE_SCOPE、 pageContext.SESSION_SCOPE、pageContext.SESSION_SCOPE、pageContext.APPLICATION_SCOPE中读取数据

3 中文字符处理

String raw = request.getParameter()

byte[] b = raw.getBytes("ISO-8859-1")

String name = new String(b,"gb2312")