这几天要构思用javascript调用asp.net的webservice，需要到xmlhttp来支持，但发现opera的xmlhttprequest很烂，实在支持不下去，后来到处找，终于发现这份代码，在opera中是利用java.net.url等类来实现的，不敢独享，特发上来与大家同乐。
复制代码 代码如下:
/*
cross-browser xmlhttprequest v1.2
=================================
emulate gecko 'xmlhttprequest()' functionality in ie and opera. opera requires
the sun java runtime environment .
by andrew gregory
http://www.scss.com.au/family/andrew/webdesign/xmlhttprequest/
this work is licensed under the creative commons attribution license. to view a
copy of this license, visit http://creativecommons.org/licenses/by-sa/2.5/ or
send a letter to creative commons, 559 nathan abbott way, stanford, california
94305, usa.
attribution: leave my name and web address in this script intact.
not supported in opera
----------------------
* user/password authentication
* responsexml data member
not fully supported in opera
----------------------------
* async requests
* abort()
* getallresponseheaders(), getallresponseheader(header)
*/
// ie support
if (window.activexobject && !window.xmlhttprequest) {
window.xmlhttprequest = function() {
var msxmls = new array(
'msxml2.xmlhttp.5.0',
'msxml2.xmlhttp.4.0',
'msxml2.xmlhttp.3.0',
'msxml2.xmlhttp',
'microsoft.xmlhttp');
for (var i = 0; i try {
return new activexobject(msxmls[i]);
} catch (e) {
}
}
return null;
};
}
// gecko support
/* ;-) */
// opera support
if (window.opera && !window.xmlhttprequest) {
window.xmlhttprequest = function() {
this.readystate = 0; // 0=uninitialized,1=loading,2=loaded,3=interactive,4=complete
this.status = 0; // http status codes
this.statustext = '';
this._headers = [];
this._aborted = false;
this._async = true;
this._defaultcharset = 'iso-8859-1';
this._getcharset = function() {
var charset = _defaultcharset;
var contenttype = this.getresponseheader('content-type').touppercase();
val = contenttype.indexof('charset=');
if (val != -1) {
charset = contenttype.substring(val);
}
val = charset.indexof(';');
if (val != -1) {
charset = charset.substring(0, val);
}
val = charset.indexof(',');
if (val != -1) {
charset = charset.substring(0, val);
}
return charset;
};
this.abort = function() {
this._aborted = true;
};
this.getallresponseheaders = function() {
return this.getallresponseheader('*');
};
this.getallresponseheader = function(header) {
var ret = '';
for (var i = 0; i if (header == '*' || this._headers[i].h == header) {
ret += this._headers[i].h + ': ' + this._headers[i].v + '\n';
}
}
return ret;
};
this.getresponseheader = function(header) {
var ret = getallresponseheader(header);
var i = ret.indexof('\n');
if (i != -1) {
ret = ret.substring(0, i);
}
return ret;
};
this.setrequestheader = function(header, value) {
this._headers[this._headers.length] = {h:header, v:value};
};
this.open = function(method, url, async, user, password) {
this.method = method;
this.url = url;
this._async = true;
this._aborted = false;
this._headers = [];
if (arguments.length >= 3) {
this._async = async;
}
if (arguments.length > 3) {
opera.posterror('xmlhttprequest.open() - user/password not supported');
}
this.readystate = 1;
if (this.onreadystatechange) {
this.onreadystatechange();
}
};
this.send = function(data) {
if (!navigator.javaenabled()) {
alert(xmlhttprequest.send() - java must be installed and enabled.);
return;
}
if (this._async) {
settimeout(this._sendasync, 0, this, data);
// this is not really asynchronous and won't execute until the current
// execution context ends
} else {
this._sendsync(data);
}
}
this._sendasync = function(req, data) {
if (!req._aborted) {
req._sendsync(data);
}
};
this._sendsync = function(data) {
this.readystate = 2;
if (this.onreadystatechange) {
this.onreadystatechange();
}
// open connection
var url = new java.net.url(new java.net.url(window.location.href), this.url);
var conn = url.openconnection();
for (var i = 0; i conn.setrequestproperty(this._headers[i].h, this._headers[i].v);
}
this._headers = [];
if (this.method == 'post') {
// post data
conn.setdooutput(true);
var wr = new java.io.outputstreamwriter(conn.getoutputstream(), this._getcharset());
wr.write(data);
wr.flush();
wr.close();
}
// read response headers
// note: the getheaderfield() methods always return nulls for me :(
var gotcontentencoding = false;
var gotcontentlength = false;
var gotcontenttype = false;
var gotdate = false;
var gotexpiration = false;
var gotlastmodified = false;
for (var i = 0; ; i++) {
var hdrname = conn.getheaderfieldkey(i);
var hdrvalue = conn.getheaderfield(i);
if (hdrname == null && hdrvalue == null) {
break;
}
if (hdrname != null) {
this._headers[this._headers.length] = {h:hdrname, v:hdrvalue};
switch (hdrname.tolowercase()) {
case 'content-encoding': gotcontentencoding = true; break;
case 'content-length' : gotcontentlength = true; break;
case 'content-type' : gotcontenttype = true; break;
case 'date' : gotdate = true; break;
case 'expires' : gotexpiration = true; break;
case 'last-modified' : gotlastmodified = true; break;
}
}
}
// try to fill in any missing header information
var val;
val = conn.getcontentencoding();
if (val != null && !gotcontentencoding) this._headers[this._headers.length] = {h:'content-encoding', v:val};
val = conn.getcontentlength();
if (val != -1 && !gotcontentlength) this._headers[this._headers.length] = {h:'content-length', v:val};
val = conn.getcontenttype();
if (val != null && !gotcontenttype) this._headers[this._headers.length] = {h:'content-type', v:val};
val = conn.getdate();
if (val != 0 && !gotdate) this._headers[this._headers.length] = {h:'date', v:(new date(val)).toutcstring()};
val = conn.getexpiration();
if (val != 0 && !gotexpiration) this._headers[this._headers.length] = {h:'expires', v:(new date(val)).toutcstring()};
val = conn.getlastmodified();
if (val != 0 && !gotlastmodified) this._headers[this._headers.length] = {h:'last-modified', v:(new date(val)).toutcstring()};
// read response data
var reqdata = '';
var stream = conn.getinputstream();
if (stream) {
var reader = new java.io.bufferedreader(new java.io.inputstreamreader(stream, this._getcharset()));
var line;
while ((line = reader.readline()) != null) {
if (this.readystate == 2) {
this.readystate = 3;
if (this.onreadystatechange) {
this.onreadystatechange();
}
}
reqdata += line + '\n';
}
reader.close();
this.status = 200;
this.statustext = 'ok';
this.responsetext = reqdata;
this.readystate = 4;
if (this.onreadystatechange) {
this.onreadystatechange();
}
if (this.onload) {
this.onload();
}
} else {
// error
this.status = 404;
this.statustext = 'not found';
this.responsetext = '';
this.readystate = 4;
if (this.onreadystatechange) {
this.onreadystatechange();
}
if (this.onerror) {
this.onerror();
}
}
};
};
}
// activexobject emulation
if (!window.activexobject && window.xmlhttprequest) {
window.activexobject = function(type) {
switch (type.tolowercase()) {
case 'microsoft.xmlhttp':
case 'msxml2.xmlhttp':
case 'msxml2.xmlhttp.3.0':
case 'msxml2.xmlhttp.4.0':
case 'msxml2.xmlhttp.5.0':
return new xmlhttprequest();
}
return null;
};
}