const int DefaultTimeout = 60 * 1000; // 1 minutes timeout
#endregion Fields
#region Methods
//异步方式发起http get请求
public bool HttpGet(string url, string queryString, AsyncHttpCallback callback)
{
if (!string.IsNullOrEmpty(queryString))
{
url += "?" + queryString;
}
HttpWebRequest webRequest = WebRequest.Create(url) as HttpWebRequest;
webRequest.Method = "GET";
webRequest.ServicePoint.Expect100Continue = false;
try
{
RequestState state = new RequestState();
state.cb = callback;
state.request = webRequest;
IAsyncResult result = (IAsyncResult)webRequest.BeginGetResponse(new AsyncCallback(ResponseCallback), state);
// this line implements the timeout, if there is a timeout, the callback fires and the request becomes aborted
ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), webRequest, DefaultTimeout, true);
// The response came in the allowed time. The work processing will happen in the callback function.
allDone.WaitOne();
// Release the HttpWebResponse resource.
state.response.Close();
}
catch
{
return false;
}
return true;
}
//异步方式发起http post请求
public bool HttpPost(string url, string queryString, AsyncHttpCallback callback)
{
StreamWriter requestWriter = null;
// StreamReader responseReader = null;
// string responseData = null;
HttpWebRequest webRequest = WebRequest.Create(url) as HttpWebRequest;
webRequest.Method = "POST";
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.ServicePoint.Expect100Continue = false;
try
{
//POST the data.
requestWriter = new StreamWriter(webRequest.GetRequestStream());
requestWriter.Write(queryString);
requestWriter.Close();
requestWriter = null;
RequestState state = new RequestState();
state.cb = callback;
state.request = webRequest;
IAsyncResult result = (IAsyncResult)webRequest.BeginGetResponse(new AsyncCallback(ResponseCallback), state);
// this line implements the timeout, if there is a timeout, the callback fires and the request becomes aborted
ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), webRequest, DefaultTimeout, true);
// The response came in the allowed time. The work processing will happen in the
// callback function.
allDone.WaitOne();
// Release the HttpWebResponse resource.
state.response.Close();
}
catch
{
return false;
}
finally
{
if (requestWriter != null)
{
requestWriter.Close();
requestWriter = null;
}
}
return true;
}
private void FireCallback(RequestState state)
{
//call back
if (state.cb != null)
{
state.cb(this, state.requestData.ToString());
}
}
//异步方式发起http post请求，可以同时上传文件
public bool HttpPostWithFile(string url, string queryString, List<APIParameter> files, AsyncHttpCallback callback)
{
Stream requestStream = null;
string boundary = DateTime.Now.Ticks.ToString("x");
url += '?' + queryString;
HttpWebRequest webRequest = WebRequest.Create(url) as HttpWebRequest;
webRequest.ServicePoint.Expect100Continue = true;
webRequest.ContentType = "multipart/form-data; boundary=" + boundary;
webRequest.Method = "POST";
webRequest.KeepAlive = true;
webRequest.Credentials = CredentialCache.DefaultCredentials;
try
{
Stream memStream = new MemoryStream();
byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
string formdataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
List<APIParameter> listParams = HttpUtil.GetQueryParameters(queryString);
foreach (APIParameter param in listParams)
{
//需要将
string formitem = string.Format(formdataTemplate, param.Name, (FormParamDecode(param.Value)));
byte[] formitembytes = Encoding.UTF8.GetBytes(formitem);
memStream.Write(formitembytes, 0, formitembytes.Length);
}
memStream.Write(boundarybytes, 0, boundarybytes.Length);
string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: \"{2}\"\r\n\r\n";
foreach (APIParameter param in files)
{
string name = param.Name;
string filePath = param.Value;
string file = Path.GetFileName(filePath);
string contentType = HttpUtil.GetContentType(file);
string header = string.Format(headerTemplate, name, file, contentType);
byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
memStream.Write(headerbytes, 0, headerbytes.Length);
FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
memStream.Write(buffer, 0, bytesRead);
}
memStream.Write(boundarybytes, 0, boundarybytes.Length);
fileStream.Close();
}
webRequest.ContentLength = memStream.Length;
requestStream = webRequest.GetRequestStream();
memStream.Position = 0;
byte[] tempBuffer = new byte[memStream.Length];
memStream.Read(tempBuffer, 0, tempBuffer.Length);
memStream.Close();
requestStream.Write(tempBuffer, 0, tempBuffer.Length);
requestStream.Close();
requestStream = null;
RequestState state = new RequestState();
state.cb = callback;
state.request = webRequest;
IAsyncResult result = (IAsyncResult)webRequest.BeginGetResponse(new AsyncCallback(ResponseCallback), state);
ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback),
webRequest, DefaultTimeout, true);
allDone.WaitOne();
state.response.Close();
}
catch
{
return false;
}
finally
{
if (requestStream != null)
{
requestStream.Close();
requestStream = null;
}
}
return true;
}