• .Net下采用GET/POST/SOAP方式动态调用WebService的简易灵活方法(C#)


     

      一直以来,我都为动态调用WebService方法而烦恼。在.Net环境 下,最常用的方法就是采用代理类来调用WebService,可以通过改变代理类的Url属性来实现动态调用,但当xmlns改变时就会出错,似乎要重新 绑定Webservice并重新编译后才能再次运行。我还试过网上的一种动态编译并动态调用WebService的方式,这种方法效率低,而且需要有较高 的权限,否则编译失败。我曾在Sql Server 2005的CLR存储过程中用此方法调用WebService时,浪费了大半天时间,无论怎么试它就是不能成功编译。于是我便不断思考其他的方法,今天晚 上终于写了一个类用于动态调用WebService,只需传入WebService地址、需调用的方法及其参数,就可以随时动态调用了。现分享给大家,代 码如下:

    using System;
    using System.Web;
    using System.Xml;
    using System.Collections;
    using System.Net;
    using System.Text;
    using System.IO;
    /// <summary>
    /// 利用WebRequest/WebResponse进行WebService调用的类
    /// </summary>
    public class WebSvcCaller
    {
        //<webServices>
        // <protocols>
        //    <add name="HttpGet"/>
        //    <add name="HttpPost"/>
        // </protocols>
        //</webServices>
        private static Hashtable _xmlNamespaces = new Hashtable();//缓存xmlNamespace,避免重复调用GetNamespace
        /// <summary>
        /// 需要WebService支持Post调用
        /// </summary>
        public static XmlDocument QueryPostWebService(String URL , String MethodName , Hashtable Pars)
        {
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(URL + "/" + MethodName);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            SetWebRequest(request);
            byte[] data = EncodePars(Pars);
            WriteRequestData(request , data);
            return ReadXmlResponse(request.GetResponse());
        }
        /// <summary>
        /// 需要WebService支持Get调用
        /// </summary>
        public static XmlDocument QueryGetWebService(String URL , String MethodName , Hashtable Pars)
        {
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(URL + "/" + MethodName + "?" + ParsToString(Pars));
            request.Method = "GET";
            request.ContentType = "application/x-www-form-urlencoded";
            SetWebRequest(request);
            return ReadXmlResponse(request.GetResponse());
        }

        /// <summary>
        /// 通用WebService调用(Soap),参数Pars为String类型的参数名、参数值
        /// </summary>
        public static XmlDocument QuerySoapWebService(String URL , String MethodName , Hashtable Pars)
        {
            if (_xmlNamespaces.ContainsKey(URL))
            {
                return QuerySoapWebService(URL , MethodName , Pars , _xmlNamespaces[URL].ToString());
            }
            else
            {
                return QuerySoapWebService(URL , MethodName , Pars ,GetNamespace(URL));
            }
        }
        private static XmlDocument QuerySoapWebService(String URL , String MethodName , Hashtable Pars , string XmlNs)
        {
            _xmlNamespaces[URL] = XmlNs;//加入缓存,提高效率
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(URL);
            request.Method = "POST";
            request.ContentType = "text/xml; charset=utf-8";
            request.Headers.Add("SOAPAction" , """ + XmlNs + (XmlNs.EndsWith("/") ? "" : "/") + MethodName + """);
            SetWebRequest(request);
            byte[] data = EncodeParsToSoap(Pars , XmlNs , MethodName);
            WriteRequestData(request , data);
            XmlDocument doc = new XmlDocument() , doc2 = new XmlDocument();
            doc = ReadXmlResponse(request.GetResponse());
            XmlNamespaceManager mgr = new XmlNamespaceManager(doc.NameTable);
            mgr.AddNamespace("soap" , "http://schemas.xmlsoap.org/soap/envelope/");
            String RetXml = doc.SelectSingleNode("//soap:Body/*" , mgr).InnerXml;
            doc2.LoadXml("<root>" + RetXml + "</root>");
            AddDelaration(doc2);
            return doc2;
        }
        private static string GetNamespace(String URL)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL + "?WSDL");
            SetWebRequest(request);
            WebResponse response = request.GetResponse();
            StreamReader sr = new StreamReader(response.GetResponseStream() , Encoding.UTF8);
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(sr.ReadToEnd());
            return doc.SelectSingleNode("//@targetNamespace").Value;
        }
        private static byte[] EncodeParsToSoap(Hashtable Pars , String XmlNs , String MethodName)
        {
            XmlDocument doc = new XmlDocument();
            doc.LoadXml("<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/"></soap:Envelope>");
            AddDelaration(doc);
            XmlElement soapBody = doc.CreateElement("soap" , "Body" , "http://schemas.xmlsoap.org/soap/envelope/");
            XmlElement soapMethod = doc.CreateElement(MethodName);
            soapMethod.SetAttribute("xmlns" , XmlNs);
            foreach (string k in Pars.Keys)
            {
                XmlElement soapPar = doc.CreateElement(k);
                soapPar.InnerText = Pars[k].ToString();
                soapMethod.AppendChild(soapPar);
            }
            soapBody.AppendChild(soapMethod);
            doc.DocumentElement.AppendChild(soapBody);
            return Encoding.UTF8.GetBytes(doc.OuterXml);
        }
        private static void SetWebRequest(HttpWebRequest request)
        {
            request.Credentials = CredentialCache.DefaultCredentials;
            request.Timeout = 10000;
        }
        private static void WriteRequestData(HttpWebRequest request , byte[] data)
        {
            request.ContentLength = data.Length;
            Stream writer = request.GetRequestStream();
            writer.Write(data , 0 , data.Length);
            writer.Close();
        }
        private static byte[] EncodePars(Hashtable Pars)
        {
            return Encoding.UTF8.GetBytes(ParsToString(Pars));
        }
        private static String ParsToString(Hashtable Pars)
        {
            StringBuilder sb = new StringBuilder();
            foreach (string k in Pars.Keys)
            {
                if (sb.Length > 0)
                {
                    sb.Append("&");
                }
                sb.Append(HttpUtility.UrlEncode(k) + "=" + HttpUtility.UrlEncode(Pars[k].ToString()));
            }
            return sb.ToString();
        }
        private static XmlDocument ReadXmlResponse(WebResponse response)
        {
            StreamReader sr = new StreamReader(response.GetResponseStream() , Encoding.UTF8);
            String retXml = sr.ReadToEnd();
            sr.Close();
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(retXml);
            return doc;
        }
        private static void AddDelaration(XmlDocument doc)
        {
            XmlDeclaration decl = doc.CreateXmlDeclaration("1.0" , "utf-8" , null);
            doc.InsertBefore(decl , doc.DocumentElement);
        }
    }
    这个类有三个公用的方法:QuerySoapWebService为通用的采用Soap方式调用 WebService,QueryGetWebService采用GET方式调用,QueryPostWebService采用POST方式调用,后两个 方法需要WebService服务器支持相应的调用方式。三个方法的参数和返回值相同:URL为Webservice的Url地址(以.asmx结尾 的);MethodName为要调用的方法名称;Pars为参数表,它的Key为参数名称,Value为要传递的参数的值。注意方法名称、参数名称、参数 个数必须完全匹配才能正确调用。第一次以Soap方式调用时,因为需要查询WSDL获取xmlns,因此需要时间相对长些,第二次调用不用再读WSDL, 直接从缓存读取。这三个方法的返回值均为XmlDocument对象,这个返回的对象可以进行各种灵活的操作。最常用的一个 SelectSingleNode方法,可以让你一步定位到Xml的任何节点,再读取它的文本或属性。也可以直接调用Save保存到磁盘。采用Soap方 式调用时,根结点名称固定为root。
    这个类主要是利用了WebRequest/WebResponse来完成各种网络查询操作。为了精简明了,这个类中没有添加错误处理,需要在调用的地方设置异常捕获。
    下面是一个调用实例:
        protected void Page_Load(object sender , EventArgs e)
        {
            try
            {
                Hashtable pars = new Hashtable();
                String Url = "http://www.260dns.cn/Services/Weather.asmx";
                pars["city"] = "上海";
                pars["wdate"]="2008-3-19";
                XmlDocument doc = WebSvcCaller.QuerySoapWebService(Url , "GetWeather" , pars);
                Response.Write(doc.OuterXml);
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message);
            }
        }
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  • 原文地址:https://www.cnblogs.com/fery/p/1790098.html
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