Jsp九种对象详解教程

jsp的九种对象我简述之：
page
application
request
response
session
config
out
pagecontext
 
page
<%@page contenttype="text/html; charset=gb2312" language="java" import="java.sql.*" %>

response
<%
  response.setheader("pragma","no-cache"); 
  response.setheader("cache-control","no-cache"); 
  response.setdateheader("expires", 0); 
%>

<%response.sendredirect("login.jsp");%>

session
<%session.invalidate();%>

request/session
<%
 string errmsg = request.getparameter("errmsg");
 request.getsession(true);
 string chk = "false";
 session.putvalue("enter",chk);
%>

out
<%
 if(errmsg != null && errmsg.equals("error1"))
  out.print("你的用户号还没有开通!!");
 else if(errmsg != null && errmsg.equals("error2"))
  out.print("您输入管理员帐号或者密码不正确!!");
%> 

下面是request对象在java doc中的说明：其他类似