jsp内置对象（四）：response，，out，pagecontext
分类：servlet+jsp
jsp
一：response对象
1.定时刷新
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>My JSP ‘responseDemo1.jsp’ starting page</title> </head> <body> <%! //定义一个全局变量 int count=0; %> <% response.setHeader("refresh","2"); %> <h3>刷新了<%=count++ %>次！</h3> </body></html>
2.设置Cookie
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>My JSP ‘responseDemo2.jsp’ starting page</title> </head> <body> <% //创建cookie Cookie ck1=new Cookie("aa","Spring"); Cookie ck2=new Cookie("bb","Summer"); //设置保存时间 ck1.setMaxAge(60); ck2.setMaxAge(60); //添加cookie response.addCookie(ck1); response.addCookie(ck2); %> </body></html>
3.获取cookie
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>My JSP ‘responseDemo1.jsp’ starting page</title> </head> <body> <% //取出Cookie Cookie c[]=request.getCookies(); for(int i=0;i<c.length;i++){ %> <h3><%=c[i].getName() %>–><%=c[i].getValue() %></h3> <% } %> </body></html>
二：out对象
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>My JSP ‘init.jsp’ starting page</title> </head> <body> <% int buffer=out.getBufferSize(); int avaliable=out.getRemaining(); int use=buffer-avaliable; %> 缓冲区大小：<%=buffer %><br> 未使用的大小：<%=avaliable %><br> 使用的大小：<%=use %> </body></html>
三：pageContext对象
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>My JSP ‘pageContext.jsp’ starting page</title> </head> <body> <% //页面跳转 pageContext.forward("Demo2.jsp?info=spring"); %> </body></html>
Demo2.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>My JSP ‘Demo2.jsp’ starting page</title> </head> <body> <% String info=pageContext.getRequest().getParameter("info"); %> <h3>info=<%=info %></h3> <h3>realPath=<%=pageContext.getServletContext().getRealPath("/") %></h3> </body></html>
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