通过WebClient/HttpWebRequest实现http的post/get方法

 ///<summary>/// 通过WebClient类Post数据到远程地址，需要Basic认证；
 /// 调用端自己处理异常
 ///</summary>///<param name="uri"></param>///<param name="paramStr">name=张三&age=20</param>///<param name="encoding">请先确认目标网页的编码方式</param>///<param name="username"></param>///<param name="password"></param>///<returns></returns>publicstaticstring Request_WebClient(string uri, string paramStr, Encoding encoding, string username, string password)
         {
 if (encoding == null)
                  encoding = Encoding.UTF8;
 string result = string.Empty;

              WebClient wc = new WebClient();
 // 采取POST方式必须加的Header
              wc.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
 byte[] postData = encoding.GetBytes(paramStr);
 if (!string.IsNullOrEmpty(username) && !string.IsNullOrEmpty(password))
             {
                  wc.Credentials = GetCredentialCache(uri, username, password);
                  wc.Headers.Add("Authorization", GetAuthorization(username, password));
             }
 byte[] responseData = wc.UploadData(uri, "POST", postData); // 得到返回字符流return encoding.GetString(responseData);// 解码
          }

       //get方法
 publicstaticstring GetHttp(string url, HttpContext httpContext)
     {
 string queryString = "?";
 foreach (string key in httpContext.Request.QueryString.AllKeys)
         {
              queryString += key + "=" + httpContext.Request.QueryString[key] + "&";
         }

         queryString = queryString.Substring(, queryString.Length - );

          HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url + queryString);

          httpWebRequest.ContentType = "application/json";
          httpWebRequest.Method = "GET";
          httpWebRequest.Timeout = ;
 //byte[] btBodys = Encoding.UTF8.GetBytes(body);
 //httpWebRequest.ContentLength = btBodys.Length;
 //httpWebRequest.GetRequestStream().Write(btBodys, 0, btBodys.Length);

          HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
          StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream());
 string responseContent = streamReader.ReadToEnd();
         httpWebResponse.Close();
         streamReader.Close();
 return responseContent;
      }

 ///<summary>/// 通过 WebRequest/WebResponse 类访问远程地址并返回结果，需要Basic认证；
 /// 调用端自己处理异常
 ///</summary>///<param name="uri"></param>///<param name="timeout">访问超时时间，单位毫秒；如果不设置超时时间，传入0</param>///<param name="encoding">如果不知道具体的编码，传入null</param>///<param name="username"></param>///<param name="password"></param>///<returns></returns>publicstaticstring Request_WebRequest(string uri, int timeout, Encoding encoding, string username, string password)
         {
 string result = string.Empty;

              WebRequest request = WebRequest.Create(new Uri(uri));
 if (!string.IsNullOrEmpty(username) && !string.IsNullOrEmpty(password))
             {
                  request.Credentials = GetCredentialCache(uri, username, password);
                  request.Headers.Add("Authorization", GetAuthorization(username, password));
             }
 if (timeout > )
                  request.Timeout = timeout;

              WebResponse response = request.GetResponse();
              Stream stream = response.GetResponseStream();
              StreamReader sr = encoding == null ? new StreamReader(stream) : new StreamReader(stream, encoding);

              result = sr.ReadToEnd();
             sr.Close();
             stream.Close();
 return result;
         }
 #region # 生成 Http Basic 访问凭证 #

          privatestatic CredentialCache GetCredentialCache(string uri, string username, string password)
         {
 string authorization = string.Format("{0}:{1}", username, password);

              CredentialCache credCache = new CredentialCache();
              credCache.Add(new Uri(uri), "Basic", new NetworkCredential(username, password));
 return credCache;
         }
 privatestaticstring GetAuthorization(string username, string password)
         {
 string authorization = string.Format("{0}:{1}", username, password);
 return"Basic " + Convert.ToBase64String(new ASCIIEncoding().GetBytes(authorization));
         }
 #endregion

 //body是要传递的参数,格式"roleId=1&uid=2"
 //post的cotentType填写:
 //"application/x-www-form-urlencoded"
 //soap填写:"text/xml; charset=utf-8"
 public static string PostHttp(string url, string body, string contentType)
     {
          HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);

          httpWebRequest.ContentType = contentType;
          httpWebRequest.Method = "POST";
          httpWebRequest.Timeout = ;
 byte[] btBodys = Encoding.UTF8.GetBytes(body);
          httpWebRequest.ContentLength = btBodys.Length;
          httpWebRequest.GetRequestStream().Write(btBodys, , btBodys.Length);

          HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
          StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream());
 string responseContent = streamReader.ReadToEnd();
         httpWebResponse.Close();
         streamReader.Close();
         httpWebRequest.Abort();
         httpWebResponse.Close();
 return responseContent;
      }