httpclient.js

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// Description:	js.net.http.HttpClient 类
// Author:	Changhua.Wan
// Version:	2004.01.26.01


_package("js.net.http");

_import("js.activex.MsxmlFactory");
_import("js.net.http.Request");
_import("js.net.http.Response");
_import("js.net.http.HttpException");

function js.net.http.HttpClient() {

	this.url = "";
	this.method = "GET";
	this.async = false;

	// * 默认的Request和Response，可重定义
		//* Request实现接口 getContentType,toString
		//* Response实现接口 parse

	this.request = new js.net.http.Request();
	this.response = new js.net.http.Response();
	this.xmlHttp = MsxmlFactory.getXmlHttp();
	this.onCompleted = null;
	this.parsed = false; // for 兼容早版本xmlhttp
	var _self = this;
	this.xmlHttp.onReadyStateChange = function() {
		if (_self.xmlHttp.readyState == 4) {
			if (!_self.parsed) {
				_self.response.parse(_self.xmlHttp);
				_self.parsed = true;
			}
			if (typeof(_self.onCompleted) != "function") return;
			_self.onCompleted(_self.response);
		}
	}
}

var _p = js.net.http.HttpClient._extends("js.lang.Object");
var _c = js.net.http.HttpClient;

_p.open = function() {
	try {
		this.xmlHttp.open(this.method, this.url, this.async);
		this.xmlHttp.setRequestHeader('CONTENT-TYPE', this.request.getContentType());
		if (this.method.toLowerCase() == 'get')
			this.xmlHttp.send();
		else
			this.xmlHttp.send(this.request.toData());
		if (!this.async) {
			if (this.xmlHttp.status == 200 || this.xmlHttp.status == 0) {
				// for 早版本xmlhttp
				if (!this.parsed) {
					this.response.parse(this.xmlHttp);
					this.parsed = true;
				}
				return this.response;
			} else {
				_throw (new js.net.http.HttpException(" "
						+ this.className
						+ " "
						+ this.method
						+ " "
						+ this.url
						+ "请求失败 [HTTP-STATUS:"
						+ this.xmlHttp.status
						+ "]"
					));
			}
		}
	} catch(ex) {
		_throw (new js.net.http.HttpException(" "
				+ this.className
				+ " open 异常："
				+ ex.description
			));
	}
};
_p.doPost = function() {
	this.method = "POST";
	return this.open();
};
_p.doGet = function() {
	this.method = "GET";
	return this.open();
};
_p.doHead = function() {
	this.method = "HEAD";
	return this.open();
};
_p.abort = function() {
	this.xmlHttp.Abort();	
};


static:{ // 静态方法

_c.ifModifiedSince = function(_url, _date) {
	var xmlHttp = MsxmlFactory.getXmlHttp();
	xmlHttp.open("HEAD", _url, false);
	xmlHttp.setRequestHeader('If-Modified-Since', _date.toGMTString());
	xmlHttp.send();
	if (xmlHttp.status == 200 || xmlHttp.status == 0) return true;
	if (xmlHttp.status == 304) return false;
	_throw (new js.net.http.HttpException(
		"js.net.http.HttpClient.ifModifiedSince()"
		+ this.url
		+ " 请求失败 [HTTP-STATUS:"
		+ xmlHttp.status
		+ "]"
	));
};
_c.exist = function(_url) {
	var xmlHttp = MsxmlFactory.getXmlHttp();
	xmlHttp.open("HEAD", _url, false);
	xmlHttp.send();
	return ( xmlHttp.status == 200 || xmlHttp.status == 0 );
};

}