C#中C/S端实现WebService服务

2022-07-22 15:13:12

目录前言一、实现思路二、步骤1.使用HttpListener构建服务2.处理请求的数据总结前言使用C#以B/S方式构建WebService服务十分简便,即是使用Asp.net在网站中添加WebSer...

目录
前言
一、实现思路
二、步骤
1.使用HttpListener构建服务
2.处理请求的数据
总结

前言

使用 C#以B/S方式构建WebService服务十分简便,即是使用ASP.NET在网站中添加WebService服务并使用IIS发布。但如需要在C/S程序中发布WebService服务则没有直接可用的类库。因此需要使用另外的方式实现WebService服务。

一、实现思路

WebService实际是使用Http并遵循SOAP协议格式进行交互。能够进行Http通讯即可实现WebService服务,只是没了现成的类库就需要自己编写解析SOAP格式数据包和组织应答包。

二、步骤

1.使用HttpListener构建服务

代码如下(示例):

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.Net;
using System.Web;

namespace LadarManufacturabilityTooling
{
  public class HttpServic
  {
    public delegate byte[] OnGetResponseDataHandle(HttpListenerPostValue Sender);
    public event OnGetResponseDataHandle OnGetResponse;

    private static HttpListener httpPostRequest = new HttpListener();
    private static bool IsRun = true;
    public HttpServic(IPAddress HttpServerIP, int HttpServerPort)
    {
      httpPostRequest.Prefixes.Add("http://" + HttpServerIP.ToString() + ":" + HttpSehttp://www.cppcns.comrverPort.ToString() + "/");

      try
      {
        httpPostRequest.Start();
      }
      catch(Exception ex)
      {
        string Mes = ex.Message;
      }

      Thread ThrednHttpPostRequest = new Thread(new ThreadStart(httpPostRequestHandle));
      ThrednHttpPostRequest.Start();
    }

    private void httpPostRequestHandle()
    {
      while (IsRun)
      {
        try
        {
          HttpListenerContext requestContext = httpPostRequest.GetContext();
          Thread threadsub = new Thread(new ParameterizedThreadStart((requestcontext) =>
          {
            HttpListenerContext request = (HttpListenerContext)requestcontext;
            //获取Post请求中的参数和值帮助类 
            HttpListenerPostParaHelper httppost = new HttpListenerPostParaHelper(request);
            //获取Post过来的参数和数据 
            HttpListenerPostValue lst = httppost.GetHttpListenerPostValue();

            byte[] buffer = null;
            if (lst != null)
            {
              if(OnGetResponse != null)
                buffer = OnGetResponse(lst);
            }

            if(buffer php!= null)
            {//Response 
              try
              {
                request.Response.StatusCode = 200;
                request.Response.Headers.Add("SOAPAction", "");
                request.Response.Headers.Add("User-Agent", "gSOAP/2.8");
                request.Response.ContentType = "text/XML; charset=utf-8";
                request.Response.ContentEncoding = Encoding.UTF8;
                request.Response.ContentLength64 = buffer.Length;
                var output = request.Response.OutputStrejavascriptam;
                output.Write(buffer, 0, buffer.Length);
                output.Close();
              }
              catch(Exception ex2)
              {
              }
            }
            else
            {
              try
              {
                request.Response.Close();
              }
              catch
              { }
            }
          }));
          threadsub.Start(requestContext);
        }
        catch (Exception ex)
        {
          string Mes = ex.Message;
        }
      }
    }
   
    public void StopHttpThread()
    {
      IsRun = false;
      httpPostRequest.Abort();
    }
  }
}

启动服务后在httpPostRequestHandle()函数中编写对监听到的服务请求的处理。

//获取Post过来的参数和数据 
HttpListenerPostValue lst = httppost.GetHttpListenerPostValue();

GetHttpListenerPostValue();函数作用为取出请求中的数据部分和请求的名称。涉及到的类定义和代码如下:

/// <summary> 
  /// HttpListenner监听Post请求参数值实体 
  /// </summary> 
  public class HttpListenerPostValue
  {
    /// <summary> 
    /// 0=> 参数 
    /// 1=> 文件 
    /// </summary> 
    public int type = 0;
    /// <summary>
    /// 请求的类型名称
    /// </summary>
    public string name;
    /// <summary>
    /// 数据字符串
    /// </summary>
    public string datas;
  }
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Web;
using System.IO;

namespace LadarManufacturabilityTooling
{
  /// <summary> 
  /// 获取Post请求中的参数和值帮助类 
  /// </summary> 
  public class HttpListenerPostParaHelper
  {
    private HttpListenerContext request;

    public HttpListenerPostParaHelper(HttpListenerContext request)
    {
      this.request = request;
    }

    /// <summary> 
    /// 获取Post过来的参数和数据 
    /// </summary> 
    /// <returns></returns> 
    public HttpListenerPostValue GetHttpListenerPostValue()
    {
      try
      {
        HttpListenerPostValue HttpListenerPostValueList = new HttpListenerPostValue();
        if (true)
        {
          Stream body = request.Request.InputStream;
          Encoding encoding = Encoding.UTF8;
          StreamReader reader = new System.IO.StreamReader(body, encoding);
          if (request.Request.ContentType != null)
          {
            Console.WriteLine("Client data content type {0}", request.Request.ContentType);
          }
          string datas = reader.ReadToEnd();
          string Requestname = request.Request.RawUrl.Replace("/","");
          HttpListenerPostValueList.datas = datas;
          HttpListenerPostValueList.name = Requestname;
          Console.WriteLine(datas);
        }
        return HttpListenerPostValueList;
      }
      catch (Exception ex)
      {
        return null;
      }
    }
  }
}

以上部分和构建普通的http监听服务并无区别。

2.处理请求的数据

OnGetResponse事件用于处理请求的数据并组织回包

代码如下(示例):

private byte[] ThisHttpServic_OnGetResponse(HttpListenerPostValue Sender)
    {
      byte[] buffer = null;
      string restr = "";
      //处理收到的请求
      switch (Sender.name)
      {
        case "MyServiceName":
        {
          string xmlOrgstr = "";
          int iStartPos = Sender.datas.IndexOf("<xmlData>", 1);
          int iStopPos = Sender.datas.IndexOf("</xmlData>", 1);
          if (iStartPos > 0)
          {
            xmlOrgstr = Sender.datas.Substring(iStartPos + 9, iStopPos - iStartPos - 9);
          }
          string xmlstr = HttpUtility.htmlDecode(xmlOrgstr);
          string LOGIN_ACK = GetPack(xmlstr);
          restr = GetCompleteSoapString(System.Security.SecurityElement.Escape(LOGIN_ACK));
          break;
        }
        default:
          restr = "";
          break;
      }

      buffer = System.Text.Encoding.UTF8.GetBytes(restr);
      return buffer;
    }

需要从收到的http请求的数据部分提取出WebService服务的参数。

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:client1="http://LSCService.chinamobile.com" xmlns:service1="http://FSUService.chinamobile.com">

<SOAP-ENV:Body SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">

<client1:invoke>

<xmlData>&lt;?xml version="1.0" encoding="UTF-8" ?&gt;&lt;Request&gt;&lt;PK_Type&gt;&lt;Name&gt;LOGIN&lt;/Name&gt;&lt;/PK_Type&gt;&lt;Info&gt;&lt;UserName&gt;cmcc&lt;/UserName&gt;&lt;PassWord&gt;B101341CC2E4D6F5B395C7544B96A826&lt;/PassWord&gt;&lt;FSUID&gt;21202110060001&lt;/FSUID&gt;&lt;FSUIP&gt;192.168.1.253&lt;/FSUIP&gt;&lt;FSUMAC&gt;00:21:92:01:b5:9f&lt;/FSUMAC&gt;&lt;FSUVER&gt;2.0.0.15 for CMCC&lt;/FSUVER&gt;&lt;/Info&gt;&lt;/Request&gt;&#xD;&#xA;

</xmlData>

</client1:invoke><

/SOAP-ENV:Body>

</SOAP-ENV:Envelope>

收到的数据包原文(Sender.datas)为:

作为示例的服务的参数名为xmlData从SOAP中截取出参数的字符串进行处理。

由于xmlData中的内容是一串xml字符,SOAP传输时经过了转义,因此还需要转义回来。

string xmlstr = HttpUtility.HtmlDecode(xmlOrgstr);

处理完相应的业务,将需要回复的数据加上SOAP协议的头尾组好回复包返回。需要转义的部分记得进行符号转义。

System.Security.SecurityElement.Escape(LOGIN_ACK)

SOAP协议的头尾根据WebService服务函数的定义有所不同,需要自行组织。示例如下:

        /// <summary>
        /// 返回完整的SOAP包
        /// </summary>
        /// <param name="XmlData">应答部分</param>
        /// <returns></returns>
        public static string GetCompleteSoapString(string XmlData)
        {
            string restr = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
            + "<SOAP-ENV:Envelope xmlns:SOAP-ENV=\"http://schemas.xmlsoap.org/soap/envelope/\""
            + " xmlns:SOAP-ENC=\"http://schemas.xmlsoap.org/soap/encoding/\""
            + " xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\""
            + " xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\""
            + " xmlns:client1=\"http://LService.mobile.com\""
            + " xmlns:service1=\"http://FService.mobile.com\">"
            + "<SOAP-ENV:Body>"
            + "<client1:invokeResponse><invokeReturn>";
            string restrEnd = "</invokeReturn></client1:invokeResponse></SOAP-ENV:Body></SOAP-ENV:Envelope>";
            restr = restr + XmlData + restrEnd;
            return restr;
        }

总结

既然C# 并未提供在C/S程序使用的WebService服务的.Net库,那么就使用HttpListener监听http请求自行解出其中的输入数据,再根据SOAP协议进行处理。以此方式实现WebService服务。

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