webservice 接口通过 HTTP 获取数据

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Net;
 using System.Text;
 using System.IO;

 namespace testRsa
 {
 public class GetDataByHttp
 {

 public static string DoPost(string url, string data)
 {
 HttpWebRequest req = GetWebRequest(url, "POST");
 byte[] postData = Encoding.UTF8.GetBytes(data);
 Stream reqStream = req.GetRequestStream();
 reqStream.Write(postData, , postData.Length);
 reqStream.Close();
 HttpWebResponse rsp = (HttpWebResponse)req.GetResponse();
 Encoding encoding = Encoding.GetEncoding(rsp.CharacterSet);
 return GetResponseAsString(rsp, encoding);
 }

 public static HttpWebRequest GetWebRequest(string url, string method)
 {
 HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
 req.ServicePoint.Expect100Continue = false;
 req.ContentType = "application/x-www-form-urlencoded;charset=utf-8";
 req.ContentType = "text/json";
 req.Method = method;
 req.KeepAlive = true;
 req.UserAgent = "guanyisoft";
 req.Timeout = ;
 req.Proxy = null;
 return req;
 }

 public static string GetResponseAsString(HttpWebResponse rsp, Encoding encoding)
 {
 StringBuilder result = new StringBuilder();
 Stream stream = null;
 StreamReader reader = null;
 try
 {
 // 以字符流的方式读取HTTP响应
 stream = rsp.GetResponseStream();
 reader = new StreamReader(stream, encoding);
 // 每次读取不大于256个字符，并写入字符串
 char[] buffer = new char[];
 int readBytes = ;
 while ((readBytes = reader.Read(buffer, , buffer.Length)) > )
 {
 result.Append(buffer, , readBytes);
 }
 }
 finally
 {
 // 释放资源
 if (reader != null) reader.Close();
 if (stream != null) stream.Close();
 if (rsp != null) rsp.Close();
 }

 return result.ToString();
 }

 }
 }