Http异步请求
AsyncHttpRequestHelperV2.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Imps.Services.CommonV4;
using System.Diagnostics;
using System.Net;
using System.IO;
namespace Imps.Services.IDCService.Utility
{
public class AysncHttpRequestHelperV2
{
public static readonly ITracing _logger = TracingManager.GetTracing(typeof(AysncHttpRequestHelperV2));
private AsynHttpContext _context;
private byte[] buffer;
private const int DEFAULT_LENGTH = 1024 * 512;
private const int DEFAULT_POS_LENGTH = 1024 * 16;
private bool notContentLength = false;
private Action<AsynHttpContext, Exception> _action;
private Stopwatch _watch = new Stopwatch();
private byte[] requestBytes;
private AysncHttpRequestHelperV2(HttpWebRequest request, Action<AsynHttpContext, Exception> callBack)
: this(new AsynHttpContext(request), callBack)
{
}
private AysncHttpRequestHelperV2(AsynHttpContext context, Action<AsynHttpContext, Exception> callBack)
{
this._context = context;
this._action = callBack;
this._watch = new Stopwatch();
}
public static void Get(HttpWebRequest request, Action<AsynHttpContext, Exception> callBack)
{
AysncHttpRequestHelperV2 proxy = new AysncHttpRequestHelperV2(request, callBack);
proxy.SendRequest();
}
public static void Get(AsynHttpContext context, Action<AsynHttpContext, Exception> callBack)
{
AysncHttpRequestHelperV2 proxy = new AysncHttpRequestHelperV2(context, callBack);
proxy.SendRequest();
}
public static void Post(HttpWebRequest request, byte[] reqBytes, Action<AsynHttpContext, Exception> callBack)
{
AysncHttpRequestHelperV2 proxy = new AysncHttpRequestHelperV2(request, callBack);
proxy.SendRequest(reqBytes);
}
public static void Post(AsynHttpContext context, byte[] reqBytes, Action<AsynHttpContext, Exception> callBack)
{
AysncHttpRequestHelperV2 proxy = new AysncHttpRequestHelperV2(context, callBack);
proxy.SendRequest(reqBytes);
}
public static void Post(HttpWebRequest request, string reqStr, Action<AsynHttpContext, Exception> callBack)
{
AysncHttpRequestHelperV2 proxy = new AysncHttpRequestHelperV2(request, callBack);
proxy.SendRequest(Encoding.UTF8.GetBytes(reqStr));
}
public static void Post(AsynHttpContext context, string reqStr, Action<AsynHttpContext, Exception> callBack)
{
AysncHttpRequestHelperV2 proxy = new AysncHttpRequestHelperV2(context, callBack);
proxy.SendRequest(Encoding.UTF8.GetBytes(reqStr));
}
/// <summary>
/// 用于http get
/// </summary>
/// <param name="req">HttpWebRequest</param>
/// <param name="action"></param>
private void SendRequest()
{
try
{
_watch.Start();
_context.RequestTime = DateTime.Now;
IAsyncResult asyncResult = _context.AsynRequest.BeginGetResponse(RequestCompleted, _context);
}
catch (Exception e)
{
_logger.Error(e, "send request exception.");
EndInvoke(_context, e);
}
}
/// <summary>
/// 用于POST
/// </summary>
/// <param name="req">HttpWebRequest</param>
/// <param name="reqBytes">post bytes</param>
/// <param name="action">call back</param>
private void SendRequest(byte[] reqBytes)
{
try
{
_watch.Start();
requestBytes = reqBytes;
_context.AsynRequest.Method = "POST";
_context.RequestTime = DateTime.Now;
IAsyncResult asyncRead = _context.AsynRequest.BeginGetRequestStream(asynGetRequestCallBack, _context.AsynRequest);
}
catch (Exception e)
{
_logger.Error(e, "send request exception.");
EndInvoke(_context, e);
}
}
private void asynGetRequestCallBack(IAsyncResult asyncRead)
{
try
{
HttpWebRequest request = asyncRead.AsyncState as HttpWebRequest;
Stream requestStream = request.EndGetRequestStream(asyncRead);
requestStream.Write(requestBytes, 0, requestBytes.Length);
requestStream.Close();
SendRequest();
}
catch (Exception e)
{
_logger.Error(e, "GetRequestCallBack exception.");
EndInvoke(_context, e);
}
}
private void asynGetRequestCallBack2(IAsyncResult asyncRead)
{
try
{
HttpWebRequest request = asyncRead.AsyncState as HttpWebRequest;
Stream requestStream = request.EndGetRequestStream(asyncRead);
requestStream.BeginWrite(requestBytes, 0, requestBytes.Length, endStreamWrite, requestStream);
}
catch (Exception e)
{
_logger.Error(e, "GetRequestCallBack exception.");
EndInvoke(_context, e);
}
}
private void endStreamWrite(IAsyncResult asyncWrite)
{
try
{
Stream requestStream = asyncWrite.AsyncState as Stream;
requestStream.EndWrite(asyncWrite);
requestStream.Close();
SendRequest();
}
catch (Exception e)
{
_logger.Error(e, "GetRequestCallBack exception.");
EndInvoke(_context, e);
}
}
private void RequestCompleted(IAsyncResult asyncResult)
{
AsynHttpContext _context = asyncResult.AsyncState as AsynHttpContext;
try
{
if (asyncResult == null) return;
_context.AsynResponse = (HttpWebResponse)_context.AsynRequest.EndGetResponse(asyncResult);
}
catch (WebException e)
{
_logger.Error(e, "RequestCompleted WebException.");
_context.AsynResponse = (HttpWebResponse)e.Response;
if (_context.AsynResponse == null)
{
EndInvoke(_context, e);
return;
}
}
catch (Exception e)
{
_logger.Error(e, "RequestCompleted exception.");
EndInvoke(_context, e);
return;
}
try
{
AsynStream stream = new AsynStream(_context.AsynResponse.GetResponseStream());
stream.Offset = 0;
long length = _context.AsynResponse.ContentLength;
if (length < 0)
{
length = DEFAULT_LENGTH;
notContentLength = true;
}
buffer = new byte[length];
stream.UnreadLength = buffer.Length;
IAsyncResult asyncRead = stream.NetStream.BeginRead(buffer, 0, stream.UnreadLength, new AsyncCallback(ReadCallBack), stream);
}
catch (Exception e)
{
_logger.Error(e, "BeginRead exception.");
EndInvoke(_context, e);
}
}
private void ReadCallBack(IAsyncResult asyncResult)
{
try
{
AsynStream stream = asyncResult.AsyncState as AsynStream;
int read = 0;
if (stream.UnreadLength > 0)
read = stream.NetStream.EndRead(asyncResult);
if (read > 0)
{
stream.Offset += read;
stream.UnreadLength -= read;
stream.Count++;
if (notContentLength && stream.Offset >= buffer.Length)
{
Array.Resize<byte>(ref buffer, stream.Offset + DEFAULT_POS_LENGTH);
stream.UnreadLength = DEFAULT_POS_LENGTH;
}
IAsyncResult asyncRead = stream.NetStream.BeginRead(buffer, stream.Offset, stream.UnreadLength, new AsyncCallback(ReadCallBack), stream);
}
else
{
_watch.Stop();
stream.NetStream.Dispose();
if (buffer.Length != stream.Offset)
Array.Resize<byte>(ref buffer, stream.Offset);
_context.ExecTime = _watch.ElapsedMilliseconds;
_context.SetResponseBytes(buffer);
_action.Invoke(_context, null);
}
}
catch (Exception e)
{
_logger.Error(e, "ReadCallBack exception.");
EndInvoke(_context, e);
}
}
private void EndInvoke(AsynHttpContext _context, Exception e)
{
try
{
_watch.Stop();
_context.ExecTime = _watch.ElapsedMilliseconds;
_action.Invoke(_context, e);
}
catch (Exception ex)
{
_logger.Error(ex, "EndInvoke exception.");
_action.Invoke(null, ex);
}
}
}
}登录后复制
AsyncHttpContext.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
namespace AsyncHttpRequestDemo
{
public enum AsynStatus { Begin, TimeOut, Runing, Completed }
public class AsynHttpContext : IDisposable
{
private HttpWebRequest _asynRequest;
private HttpWebResponse _asynResponse;
private DateTime _requestTime;
private long _execTime;
bool isDisposable = false;
private byte[] _rspBytes;
public long ExecTime
{
get { return _execTime; }
set { _execTime = value; }
}
public byte[] ResponseBytes
{
get { return _rspBytes; }
}
public HttpWebRequest AsynRequest
{
get { return _asynRequest; }
}
public HttpWebResponse AsynResponse
{
get { return _asynResponse; }
set { _asynResponse = value; }
}
public DateTime RequestTime
{
get { return _requestTime; }
set { _requestTime = value; }
}
private AsynHttpContext() { }
public AsynHttpContext(HttpWebRequest req)
{
_asynRequest = req;
}
public void SetResponseBytes(byte[] bytes)
{
_rspBytes = bytes;
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
public void OnTimeOut()
{
if (_asynRequest != null)
_asynRequest.Abort();
this.Dispose();
}
private void Dispose(bool disposing)
{
if (!isDisposable)
{
if (disposing)
{
if (_asynRequest != null)
_asynRequest.Abort();
if (_asynResponse != null)
_asynResponse.Close();
}
}
isDisposable = true;
}
~AsynHttpContext()
{
Dispose(false);
}
}
}登录后复制
AsyncStream.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace AsyncHttpRequestDemo
{
public class AsynStream
{
int _offset;
/// <summary>
/// 偏移量
/// </summary>
public int Offset
{
get { return _offset; }
set { _offset = value; }
}
int _count;
/// <summary>
/// 读取次数
/// </summary>
public int Count
{
get { return _count; }
set { _count = value; }
}
int _unreadLength;
/// <summary>
/// 没有读取的长度
/// </summary>
public int UnreadLength
{
get { return _unreadLength; }
set { _unreadLength = value; }
}
public AsynStream(int offset, int count, Stream netStream)
{
_offset = offset;
_count = count;
_netStream = netStream;
}
public AsynStream(Stream netStream)
{
_netStream = netStream;
}
Stream _netStream;
public Stream NetStream
{
get { return _netStream; }
set { _netStream = value; }
}
}
}登录后复制
调用：
Action<string, Exception> OnResponseGet = new Action<string, Exception>((s, ex) =>
{
if (ex != null)
{
string exInfo = ex.Message;
}
string ret = s;
});
try
{
string strRequestXml = "hello";
int timeout = 15000;
string contentType = "text/xml";
string url = "http://192.168.110.191:8092/getcontentinfo/";
UTF8Encoding encoding = new UTF8Encoding();
byte[] data = encoding.GetBytes(strRequestXml);
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);
myHttpWebRequest.Timeout = timeout;
myHttpWebRequest.Method = "POST";
myHttpWebRequest.ContentType = contentType;
myHttpWebRequest.ContentLength = data.Length;
//if (headers != null && headers.Count > 0)
//{
// foreach (var eachheader in headers)
// {
// myHttpWebRequest.Headers.Add(eachheader.Key, eachheader.Value);
// }
//}
AsynHttpContext asynContext = new AsynHttpContext(myHttpWebRequest);
// string tranKey = TransactionManager<AsynHttpContext>.Instance.Register(asynContext);
AysncHttpRequestHelperV2.Post(asynContext, data, new Action<AsynHttpContext, Exception>((httpContext, ex) =>
{
try
{
// TransactionManager<AsynHttpContext>.Instance.Unregister(tranKey);
if (ex != null)
{
// _tracing.Error(ex, "Exception Occurs On AysncHttpRequestHelperV2 Post Request.");
OnResponseGet(null, ex);
}
else
{
string rspStr = Encoding.UTF8.GetString(httpContext.ResponseBytes);
// _tracing.InfoFmt("Aysnc Get Response Content : {0}", rspStr);
OnResponseGet(rspStr, null);
}
}
catch (Exception ex2)
{
// _tracing.ErrorFmt(ex2, "");
OnResponseGet(null, ex2);
}
}));
}
catch (Exception ex)
{
// _tracing.Error(ex, "Exception Occurs On Aysnc Post Request.");
OnResponseGet(null, ex);
}登录后复制
以上就是C# 异步发送HTTP请求的示例代码详细介绍的内容，更多相关内容请关注Work网（www.php.cn）！