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();

 }

 }

 }