Ajax跨域代理访问网络资源的实现代码

  smart.asp

  

复制代码 代码如下:

  <script language="jscript" runat="server">

  /*

  在VBS里面的调用方法

  dim myhttp

  set myhttp = SmartHttp(url,method,data); //三个参数均可选

  属性:

  url:String,请求的URL地址

  method:String,请求的方法

  data:String,请求的数据

  charset:String,请求的URL返回数据的编码

  status:Int,请求返回的状态码

  readyState:Int,同HTTP请求的当前通讯状态,1、2、3、4

  dataset:Object,请求的数据,如果增加了,会将这部分数据附加到data属性

  dataset属性:

  charset:String,发送数据的编码

  dataset方法:

  append(key,value,noencode):添加数据

  remove(key):移除某个数据项

  isexists(key):判断某个数据项是不是存在

  clear:清除所有数据项

  方法:

  header(headstr):设置请求头,项和值之间用:分开

  timeout(t1,t2,t3,t4):设置超时时间

  send():发送请求

  getbinary:获取服务器返回的二进制数据

  gettext(charset):获取指定编码的文本

  getjson(charset):获取指定编码的json数据

  getheader(key):获取服务器返回的响应头

  getxml(charset):获取指定编码的xml数据

  */

  function SmartHttp(url,method,data){

  return new _SmartHttp(url,method,data);

  }

  function _SmartHttp(url,method,data){

  if(typeof method=="undefined") method="GET";

  if(typeof data=="undefined") data="";

  method = method.toUpperCase();

  method = method!="POST" ? "GET" : "POST";

  this.timeout=[10000,10000,10000,10000];

  this.method = method;

  this.url=url;

  this.data=data;

  this.charset="gb2312";

  this.http=null;

  this.headers=[];

  this.status=0;

  this.readyState=0;

  this.content=null;

  this.msg="";

  this.dataset={

  charset:"gb2312",

  data:[],

  append:function(key,value,noencode){

  var fn=null;

  if(this.charset.toLowerCase()=="utf-8"){fn = encodeURIComponent;}else{fn = escape;}

  if(noencode==true){fn=function(_str){return _str;}}

  this.data.push({"key":fn(key),"value":fn(value)});

  },

  remove:function(key){

  if(this.data.length<=0) return false;

  var _data=[];

  for(var i=0;i<this.data.length;i++){

  if(this.data[i].key!=key){

  _data.push(this.data[i]);

  }

  }

  this.data = _data;

  },

  isexists:function(key){

  if(this.data.length<=0) return false;

  for(var i=0;i<this.data.length;i++){

  if(this.data[i].key==key){

  return true;

  }

  }

  return false;

  },

  clear:function(){

  this.dataset.data=[];

  }

  };

  }

  _SmartHttp.prototype.init=function(){

  var datasetstr="";

  if(this.dataset.data.length>0){

  for(var i=0;i<this.dataset.data.length;i++){

  datasetstr += this.dataset.data[i].key + "=" + this.dataset.data[i].value + "&";

  }

  }

  if(datasetstr!="") datasetstr = datasetstr.substr(0,datasetstr.length-1);

  if(this.data==""){this.data = datasetstr;}else{if(datasetstr!="")this.data+= "&" + datasetstr;}

  if(this.data=="")this.data=null;

  //this.url += ((this.url.indexOf("?")<0) ? "?" : "&") + "jornd=" + this.getrnd();

  if(this.method=="GET" && this.data!=null) this.url += "&" + this.data;

  if(this.method=="POST") this.headers.push("Content-Type:application/x-www-form-urlencoded");

  if(!this.charset || this.charset=="") this.charset = "gb2312";

  };

  _SmartHttp.prototype.header=function(headstr){

  if(headstr.indexOf(":")>=0) this.headers.push(headstr);

  return this;

  };

  _SmartHttp.prototype.timeout=function(){

  if(arguments.length>4){return this;}

  for(var i =0;i<arguments.length;i++){

  if(!isNaN(arguments[i])){

  this.timeout[i] = parseInt(arguments[i]);

  }

  }

  return this;

  };

  _SmartHttp.prototype.send=function(){

  this.init();

  var _http = this.getobj();

  if(_http==null){return this;}

  try{

  _http.setTimeouts(this.timeout[0], this.timeout[1], this.timeout[2], this.timeout[3]);

  }catch(ex){}

  _http.open(this.method,this.url,false);

  if(this.headers.length>0){

  for(var i=0;i<this.headers.length;i++){

  var Sindex = this.headers[i].indexOf(":");

  var key = this.headers[i].substr(0,Sindex);

  var value = this.headers[i].substr(Sindex+1);

  _http.setRequestHeader(key,value);

  }

  }

  _http.send(this.data);

  this.readyState = _http.readyState;

  if(_http.readyState==4){

  this.status = parseInt(_http.status);

  this.http = _http;

  this.content = _http.responseBody;

  }

  return this;

  }

  _SmartHttp.prototype.getbinary=function(){

  return this.content;

  };

  _SmartHttp.prototype.gettext=function(charset){

  try{

  return this.b2s(this.content,charset ? charset : this.charset);

  }catch(ex){

  this.msg = ex.description;

  return "";

  }

  };

  _SmartHttp.prototype.getjson=function(charset){

  try{

  var _json=null;

  eval("_json=(" + this.gettext(charset) + ");");

  return _json;

  }catch(ex){

  this.msg = ex.description;

  return null;

  }

  };

  _SmartHttp.prototype.getheader=function(key){

  if(key){

  if(key.toUpperCase()=="SET-COOKIE"){

  key = key.replace("-","\-");

  var headers = this.http.getAllResponseHeaders();

  var regexp = new RegExp("\n" + key + "\:(.+?)\r","ig");

  var resstr = "";

  while((res = regexp.exec(headers))!=null){

  var val = res[1].trim();

  resstr = resstr + val.substr(0,val.indexOf(";")) + "; "

  }

  if(resstr!=""){

  resstr = resstr.substr(0,resstr.lastIndexOf(";"));

  }

  return resstr;

  }else{

  return this.http.getResponseHeader(key);

  }

  }else{return this.http.getAllResponseHeaders();}

  };

  _SmartHttp.prototype.getxml=function(charset){

  try{

  var _dom = new ActiveXObject("MSXML2.DOMDocument");

  _dom.loadXML(this.gettext(charset));

  return _dom;

  }catch(ex){

  this.msg = ex.description;

  return null;

  }

  };

  _SmartHttp.prototype.getobj = function (){

  var b=null;

  var httplist = ["MSXML2.serverXMLHttp.3.0","MSXML2.serverXMLHttp","MSXML2.XMLHttp.3.0","MSXML2.XMLHttp","Microsoft.XMLHttp"];

  for(var i = 0;i<=httplist.length -1;i++){

  try{

  b= new ActiveXObject(httplist[i]);

  (function(o){

  _SmartHttp.prototype.getobj = function(){return new ActiveXObject(o)};

  })(httplist[i]);

  return b;

  }catch(ex){

  eval("this.msg = ex.description;");

  }

  }

  return b;

  };

  _SmartHttp.prototype.getrnd = function (){return Math.random().toString().substr(2);};

  _SmartHttp.prototype.b2s = function(bytSource, Cset){ //ef bb bf,c0 fd

  var Objstream,c1,c2,c3;

  var byts;

  Objstream =Server.CreateObject("ADODB.Stream");

  Objstream.Type = 1;

  Objstream.Mode = 3;

  Objstream.Open();

  Objstream.Write(bytSource);

  Objstream.Position = 0;

  Objstream.Type = 2;

  Objstream.CharSet = Cset;

  byts = Objstream.ReadText();

  Objstream.Close();

  Objstream = null;

  return byts;

  };

  _SmartHttp.prototype.urlencode=function(str){ return encodeURIComponent(str);};

  _SmartHttp.prototype.urldecode=function(str){ return decodeURIComponent(str);};

  String.prototype.trim = function(){return this.replace(/(^(\s+)|(\s+)$)/igm,"");};

  </script>

  使用代码:

  

复制代码 代码如下:

  <!--#include file="smart.asp"-->

  <%

  Response.charset="utf-8"

  dim url,method,data,charset

  url =Request.Form("targeturl")

  method =Request.Form("method")

  data =Request.Form("data")

  charset = Request.Form("charset")

  if charset = "" then charset = "GB2312"

  response.Write SmartHttp(url,method,data).send().gettext(charset)

  set myhttp = nothing

  %>

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