asp采集数据并自动判断网页编码并转换

function send_request(url){
var codedtext;
http_request = Server.CreateObject("Microsoft.XMLHTTP");
http_request.Open("GET",url,false);
http_request.Send(null);
if (http_request.ReadyState == 4){
//自动判断编码开始
var charresult = http_request.ResponseText.match(/CharSet=(S+)">/i);
if (charresult != null){
var Cset = charresult[1];
}else{Cset = "gb2312"}//对获取不到的网站采用gb2312编码,可自行更改
//自动判断编码结束
codedtext = bytesToBSTR(http_request.Responsebody,Cset);
}else{
codedtext = "Erro";
}
return(codedtext);
}
function bytesToBSTR(body,Cset){
var objstream;
objstream = Server.CreateObject("Adodb.Stream");
objstream.Type = 1;
objstream.Mode = 3;
objstream.Open();
objstream.Write(body);
objstream.Position = 0;
objstream.Type = 2;
objstream.Charset = Cset;
bytesToBSTR = objstream.Readtext;
objstream.Close;
return(bytesToBSTR);
}%>

采集原理很简单就是用了asp xmlhttp来采集，并且adodb.stream来对采集过来的数据进行处理。