Http (GET/POST)请求


 1  /// <summary>
 2         /// Http (GET/POST)
 3         /// </summary>
 4         /// <param name="url">请求URL</param>
 5         /// <param name="parameters">请求参数</param>
 6         /// <param name="method">请求方法</param>
 7         /// <returns>响应内容</returns>
 8         static string sendPost(string url, IDictionary<string, string> parameters, string method)
 9         {
10             if (method.ToLower() == "post")
11             {
12                 HttpWebRequest req = null;
13                 HttpWebResponse rsp = null;
14                 System.IO.Stream reqStream = null;
15                 try
16                 {
17                     req = (HttpWebRequest)WebRequest.Create(url);
18                     req.Method = method;
19                     req.KeepAlive = false;
20                     req.ProtocolVersion = HttpVersion.Version10;
21                     req.Timeout = 5000;
22                     req.ContentType = "application/x-www-form-urlencoded;charset=utf-8";
23                     byte[] postData = Encoding.UTF8.GetBytes(BuildQuery(parameters, "utf8"));
24                     reqStream = req.GetRequestStream();
25                     reqStream.Write(postData, 0, postData.Length);
26                     rsp = (HttpWebResponse)req.GetResponse();
27                     Encoding encoding = Encoding.GetEncoding(rsp.CharacterSet);
28                     return GetResponseAsString(rsp, encoding);
29                 }
30                 catch (Exception ex)
31                 {
32                     return ex.Message;
33                 }
34                 finally
35                 {
36                     if (reqStream != null) reqStream.Close();
37                     if (rsp != null) rsp.Close();
38                 }
39             }
40             else
41             {
42                 //创建请求
43                 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url + "?" + BuildQuery(parameters, "utf8"));
44   
45                 //GET请求
46                 request.Method = "GET";
47                 request.ReadWriteTimeout = 5000;
48                 request.ContentType = "text/html;charset=UTF-8";
49                 HttpWebResponse response = (HttpWebResponse)request.GetResponse();
50                 Stream myResponseStream = response.GetResponseStream();
51                 StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
52   
53                 //返回内容
54                 string retString = myStreamReader.ReadToEnd();
55                 return retString;
56             }
57         }

 1 /// <summary>
 2         /// 组装普通文本请求参数。
 3         /// </summary>
 4         /// <param name="parameters">Key-Value形式请求参数字典</param>
 5         /// <returns>URL编码后的请求数据</returns>
 6         static string BuildQuery(IDictionary<string, string> parameters, string encode)
 7         {
 8             StringBuilder postData = new StringBuilder();
 9             bool hasParam = false;
10             IEnumerator<KeyValuePair<string, string>> dem = parameters.GetEnumerator();
11             while (dem.MoveNext())
12             {
13                 string name = dem.Current.Key;
14                 string value = dem.Current.Value;
15                 // 忽略参数名或参数值为空的参数
16                 if (!string.IsNullOrEmpty(name))//&& !string.IsNullOrEmpty(value)
17                 {
18                     if (hasParam)
19                     {
20                         postData.Append("&");
21                     }
22                     postData.Append(name);
23                     postData.Append("=");
24                     if (encode == "gb2312")
25                     {
26                         postData.Append(HttpUtility.UrlEncode(value, Encoding.GetEncoding("gb2312")));
27                     }
28                     else if (encode == "utf8")
29                     {
30                         postData.Append(HttpUtility.UrlEncode(value, Encoding.UTF8));
31                     }
32                     else
33                     {
34                         postData.Append(value);
35                     }
36                     hasParam = true;
37                 }
38             }
39             return postData.ToString();
40         }

 1 /// <summary>
 2         /// 把响应流转换为文本。
 3         /// </summary>
 4         /// <param name="rsp">响应流对象</param>
 5         /// <param name="encoding">编码方式</param>
 6         /// <returns>响应文本</returns>
 7         static string GetResponseAsString(HttpWebResponse rsp, Encoding encoding)
 8         {
 9             System.IO.Stream stream = null;
10             StreamReader reader = null;
11             try
12             {
13                 // 以字符流的方式读取HTTP响应
14                 stream = rsp.GetResponseStream();
15                 reader = new StreamReader(stream, encoding);
16                 return reader.ReadToEnd();
17             }
18             finally
19             {
20                 // 释放资源
21                 if (reader != null) reader.Close();
22                 if (stream != null) stream.Close();
23                 if (rsp != null) rsp.Close();
24             }
25         }