怎么在JSP中 即时在网页下更新数据中更新的数据

怎么在JSP中 即时在网页下更新数据中更新的数据 如何在JSP中 即时在网页上更新数据中更新的数据，在线等~~ 我的源码如下。 usermanger.jsp %@ page language= java % %@ page import= java.sql.* % %@ page contentType= text/html;charset=UTF-8 % %@ page language= java import= java.util.* pageEncoding= UTF-8 % % response.setHeader( Cache-Control , no-cache, no-store ); //HTTP 1.1 response.setHeader( Pragma , no-cache ); //HTTP 1.0 response.setDateHeader( Expires , 0); //prevents caching at the proxy server % html head meta http-equiv= Content-Type content= text/html; charset=UTF-8 META HTTP-EQUIV= pragma CONTENT= no-cache META HTTP-EQUIV= Cache-Control CONTENT= no-cache, must-revalidate META HTTP-EQUIV= expires CONTENT= 0 title 管理员管理 /title link href= css/Style.css rel= stylesheet type= text/css script language=javascript function checkdel() { if(confirm( 你确定要删除该管理员吗,一旦删除，将不能恢复～ )) return true; else return false; } /script link href= css/style.css rel= stylesheet type= text/css /head body style= width:100%; jsp:useBean id= connDBBean1 scope= page class= Conn.conn / % ResultSet rs=connDBBean1.executeQuery( select * from denglu );% br table width= 99% border= 0 align= center cellpadding= 0 cellspacing= 1 style= border: 2px solid #ffffff; class= border tr align= center class= sec_menu td width= 9% class= tbbgtitle ID /td td width= 20% class= tbbgtitle 账号 /td td width= 19% class= tbbgtitle 姓名 /td td width= 15% class= tbbgtitle 最后登录IP /td td width= 19% class= tbbgtitle 最后登录时间 /td td width= 18% class= tbbgtitle 操作 /td /tr % while(rs.next()){ % tr align= center class= lineheight onMouseOver= this.style.background='#F8F8F8';this.style.cursor='hand'; onMouseOut= this.style.background='';this.style.cursor='default'; % String m=rs.getString(1); int i=Integer.parseInt(m); out.print( td +i+ /td ); out.print( td +rs.getString(2)+ /td ); out.print( td +rs.getString(3)+ /td ); out.print( td +rs.getString(4)+ /td ); out.print( td +rs.getString(5)+ /td ); % td a href= delete.jsp?id= %=i% onclick= checkdel(); 删除 /a input name= admindel type= hidden id= admindel value= del /td /tr % }% /table table width= 99% border= 0 align= center cellpadding= 0 cellspacing= 1 style= border: 2px solid #ffffff; class= border