Ajax跨域请求webservice

来源：互联网发布：lua编程软件编辑：程序博客网时间：2024/06/06 07:19

web开发中ajax异步跨域请求，ajax是不支持跨域的，可以将ajax跨域转换为后台HttpWebRequest 请求

实例：请求Service.asmx中的Students方法接受两个参数 startmonth和endmonth

实现跨域请求：

首先创建一个Handler

修改方法

public void ProcessRequest(HttpContext context)
        {
            HttpRequest request = context.Request;
            HttpResponse response = context.Response;

            string requestUrl = request.RawUrl.ToString();

            if(requestUrl.Split((new char[1] { '?' })).Length == 1){
                //请求地址错误
            }

            int index = requestUrl.IndexOf("requrl=") + "requrl=".Length;
            string realUrl = requestUrl.Substring(index);
            realUrl = HttpUtility.UrlDecode(realUrl, System.Text.Encoding.UTF8);

            //参数和值

            Stream streamData = request.InputStream;
            StreamReader reader = new StreamReader(streamData, ASCIIEncoding.UTF8);
            string postData = reader.ReadToEnd();
            byte[] content = Encoding.UTF8.GetBytes(postData);



            try
            {
                //发送HTTP请求，获取服务信息
                Uri reqUrl = new Uri(realUrl);

                HttpWebRequest mReq = (HttpWebRequest)WebRequest.Create(reqUrl);
                //设置请求过期时间为10分钟
                mReq.Timeout = 600000;

                if (request.RequestType.ToLowerInvariant().Equals("post"))
                {
                    mReq.Method = "POST";

//设置服务端需要返回的编码类型

                    mReq.ContentType = string.IsNullOrWhiteSpace(request.ContentType) ? "application/x-www-form-urlencoded" : request.ContentType;
                    if (content != null && content.Length > 0)
                    {

//发送请求

                       Stream requestStream = mReq.GetRequestStream();
                        requestStream.Write(content, 0, content.Length);
                        requestStream.Close();
                    }

                }
                else if (request.RequestType.ToLowerInvariant().Equals("get"))
                {
                    mReq.Method = "GET";

                }
               //返回请求结果
                WebResponse mRes = mReq.GetResponse();
                Stream mStream = mRes.GetResponseStream();

                StreamReader sr = new StreamReader(mStream);
                string strResult = sr.ReadToEnd();

                context.Response.Write(strResult );
}


            }
            catch (System.Exception ee)
            {

            }

        }

webservice中web.config中没有开启get和post请求

$.ajax({
        url: "刚刚创建的handler名称.ashx?requrl=http://ip地址/Service.asmx/Students",//handler目录要写对    将请求的asmx传入handler
        type: 'post',
        data: “{参数1：‘参数1值’，参数2：‘参数2值’。。。。。}”,
        dataType: "xml"，//根据请求的webservice方法返回值类型定义

success: function (dt) {

}

这种请求方式是无法成功的（如果开启了，当然会请求成功）

配置文件中如果只开启了HttpSoap1.1和HttpSoap1.2协议：

</protocols>

</webServices>

HttpSoap1.1请求

参数（具体）

   var urlPar;
    urlPar = '<?xml version="1.0" encoding="utf-8"?>';
    urlPar = urlPar + '<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"    xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">';
    urlPar = urlPar + '<soap:Body>';
    urlPar = urlPar + '<Students xmlns="http://tempuri.org/">';
    urlPar = urlPar + '<startmonth>';
    urlPar = urlPar + 值;
    urlPar = urlPar + '</startmonth>';
    urlPar = urlPar + '<endmonth>';
    urlPar = urlPar + 值;
    urlPar = urlPar + '</endmonth>';
    urlPar = urlPar + '</Students>';
    urlPar = urlPar + '</soap:Body>';
    urlPar = urlPar + '</soap:Envelope>';

HttpSoap1.2请求

参数（具体）

var urlPar;
    urlPar = '<?xml version="1.0" encoding="utf-8"?>';
    urlPar = urlPar + '<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://schemas.xmlsoap.org/soap/envelope/">';
    urlPar = urlPar + '<soap12:Body>';
   urlPar = urlPar + '<Students xmlns="http://tempuri.org/">';
    urlPar = urlPar + '<startmonth>';
    urlPar = urlPar + 值;
    urlPar = urlPar + '</startmonth>';
    urlPar = urlPar + '<endmonth>';
    urlPar = urlPar + 值;
    urlPar = urlPar + '</endmonth>';
    urlPar = urlPar + '</Students>';
    urlPar = urlPar + '</soap12:Body>';
    urlPar = urlPar + '</soap12:Envelope>';

发送ajax请求

$.ajax({
        url: "刚刚创建的handler名称.ashx?requrl=http://ip地址/Service.asmx",//handler目录要写对    将请求的asmx传入handler
        type: 'post',
        contentType: "text/xml;charset=utf-8", //发送信息至服务器时内容编码类型发送xml类型的内容时必须设置
        data: urlPar,
        dataType: "xml"，

success: function (dt) {

//获取返回的数据

}

此方法不仅可以请求asmx还可以请求php、ashx、aspx。。。。。等

如有错误请指正

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