使用C#訪問百度指數：模擬發送請求/得到響應數據（2）

前面我們已經分析了發送給服務器的數據，下面就是我們怎樣把這些數據post到服務器了，我們看到對AMF的二進制數據處理（序列化及反序列化）很麻煩，有興趣的朋友可以使

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但由於我們的應用非常簡單，所以使用網上流傳的一個模擬AMF Post的類，做了些修改，主要是我們現在應用的編碼爲UTF8
class AMFPostData { public List<byte> Message; /// <summary> /// 初始化Message /// </summary> /// <param name="amftype"></param> /// <param name="headers"></param> /// <param name="bodies"></param> public AMFPostData(AMFType amftype, int headers, int bodies) { //AMF版本 if (amftype == AMFType.AMF0) { Message = new List<byte>(new byte[] { 0x00, 0x00 }); } else if (amftype == AMFType.AMF3) { Message = new List<byte>(new byte[] { 0x00, 0x03 }); } //header數量 Message.Add(BitConverter.GetBytes(headers)[1]); Message.Add(BitConverter.GetBytes(headers)[0]); //body數量 Message.Add(BitConverter.GetBytes(bodies)[1]); Message.Add(BitConverter.GetBytes(bodies)[0]); } /// <summary> /// 添加Target /// </summary> /// <param name="target"></param> /// <param name="response"></param> public void AddTargetAndResponse(string target, string response) { //添加Target長度 Message.Add(BitConverter.GetBytes(target.Length)[1]); Message.Add(BitConverter.GetBytes(target.Length)[0]); //添加Target內容 Message.AddRange(Encoding.UTF8.GetBytes(target)); //添加Response長度 Message.Add(BitConverter.GetBytes(response.Length)[1]); Message.Add(BitConverter.GetBytes(response.Length)[0]); //添加Response內容 Message.AddRange(Encoding.UTF8.GetBytes(response)); } /// <summary> /// 添加Body /// </summary> /// <param name="length"></param> /// <param name="Content"></param> public void AddBody(AMFPostDataBody amfpostdatabody) { Message.AddRange(amfpostdatabody.GetLength()); Message.AddRange(amfpostdatabody.Content.ToArray()); } } class AMFPostDataBody { private byte[] length = new byte[4]; public List<byte> Content = new List<byte>(); /// <summary> /// 初始化Body /// </summary> /// <param name="datatype"></param> /// <param name="arraylength"></param> public AMFPostDataBody(DataType datatype, int arraylength) { //添加類型標識 Content.Add((byte)datatype); //數組的話添加長度 if (datatype == DataType.Array) { Content.Add(BitConverter.GetBytes(arraylength)[3]); Content.Add(BitConverter.GetBytes(arraylength)[2]); Content.Add(BitConverter.GetBytes(arraylength)[1]); Content.Add(BitConverter.GetBytes(arraylength)[0]); } } public void AddData(DataType datatype, string value) { //添加類型標識 Content.Add((byte)datatype); switch (datatype) { case DataType.Number: AddData(double.Parse(value)); break; case DataType.String: AddData(value); break; case DataType.Boolean: AddData(Boolean.Parse(value)); break; } } #region 各種類型處理方法 /// <summary> /// Boolean /// </summary> /// <param name="flag"></param> private void AddData(bool flag) { if (flag) Content.Add(0x01); else Content.Add(0x00); } /// <summary> /// String /// </summary> /// <param name="value"></param> private void AddData(string value) { //添加長度 Content.Add(BitConverter.GetBytes(Encoding.UTF8.GetBytes(value).Length)[1]); Content.Add(BitConverter.GetBytes(Encoding.UTF8.GetBytes(value).Length)[0]); //添加內容 Content.AddRange(Encoding.UTF8.GetBytes(value)); } /// <summary> /// Number /// </summary> /// <param name="number"></param> private void AddData(double number) { byte[] b = new byte[8]; b = BitConverter.GetBytes(number); for (int i = 7; i > -1; i--) { Content.Add(b[i]); } } #endregion public byte[] GetLength() { length[0] = BitConverter.GetBytes(Content.Count)[3]; length[1] = BitConverter.GetBytes(Content.Count)[2]; length[2] = BitConverter.GetBytes(Content.Count)[1]; length[3] = BitConverter.GetBytes(Content.Count)[0]; return length; } } public enum AMFType { AMF0, AMF3 } public enum DataType { Number = 0, Boolean = 1, String = 2, UntypedObject = 3, MovieClip = 4, Null = 5, Undefined = 6, ReferencedObject = 7, MixedArray = 8, End = 9, Array = 10,//0x0A Date = 11,//0x0B LongString = 12,//0x0C TypeAsObject = 13,//0x0D Recordset = 14,//0x0E Xml = 15,//0x0F TypedObject = 16,//0x10 AMF3data = 17//0x11 }

根據前文分析結果，我們生成數據的方法如下
private static byte [] GetData(string key, string startdate, string enddate) { AMFPostData amfpostdata = new AMFPostData(AMFType.AMF3, 0, 1); amfpostdata.AddTargetAndResponse("DataAccessor.getIndexes", "/1"); AMFPostDataBody amfpostdatabody = new AMFPostDataBody(DataType.Array, 3); amfpostdatabody.AddData(DataType.String, key); amfpostdatabody.AddData(DataType.String, "0"); amfpostdatabody.AddData(DataType.String, startdate + "|" + enddate); amfpostdata.AddBody(amfpostdatabody); byte[] data = amfpostdata.Message.ToArray(); return data; }

可以使用以下方法發送數據及得到返回響應的二進制數據
public static byte[] GetFlashData(string gateway, byte[] data) { HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(gateway); request.Method = "Post"; request.ContentType = "application/x-amf"; CookieContainer cookie = new CookieContainer(); request.CookieContainer = cookie; byte[] requestData = data; request.ContentLength = requestData.Length; byte[] responseData = null; try { using (Stream requestStream = request.GetRequestStream()) { requestStream.Write(requestData, 0, requestData.Length); } HttpWebResponse response = (HttpWebResponse)request.GetResponse(); using (Stream responseStream = response.GetResponseStream()) { //StreamToBytes是將流轉換爲二進制字節數組的方法，下文補上 responseData = StreamToBytes(responseStream); } } catch (Exception ex) { Console.WriteLine(DateTime.Now.ToString() + "," + ex.Message); //Log.WriteLine(DateTime.Now.ToString() + "," + ex.Message); } return responseData; }