////// 上传数据参数 /// public class UploadEventArgs : EventArgs { int bytesSent; int totalBytes; ////// 已发送的字节数 /// public int BytesSent { get { return bytesSent; } set { bytesSent = value; } } ////// 总字节数 /// public int TotalBytes { get { return totalBytes; } set { totalBytes = value; } } } ////// 下载数据参数 /// public class DownloadEventArgs : EventArgs { int bytesReceived; int totalBytes; byte[] receivedData; ////// 已接收的字节数 /// public int BytesReceived { get { return bytesReceived; } set { bytesReceived = value; } } ////// 总字节数 /// public int TotalBytes { get { return totalBytes; } set { totalBytes = value; } } ////// 当前缓冲区接收的数据 /// public byte[] ReceivedData { get { return receivedData; } set { receivedData = value; } } } public class WebClient { Encoding encoding = Encoding.Default; string respHtml = ""; WebProxy proxy; static CookieContainer cc; WebHeaderCollection requestHeaders; WebHeaderCollection responseHeaders; int bufferSize = 15240; public event EventHandlerUploadProgressChanged; public event EventHandler DownloadProgressChanged; static WebClient() { LoadCookiesFromDisk(); } /// /// 创建WebClient的实例 /// public WebClient() { requestHeaders = new WebHeaderCollection(); responseHeaders = new WebHeaderCollection(); } ////// 设置发送和接收的数据缓冲大小 /// public int BufferSize { get { return bufferSize; } set { bufferSize = value; } } ////// 获取响应头集合 /// public WebHeaderCollection ResponseHeaders { get { return responseHeaders; } } ////// 获取请求头集合 /// public WebHeaderCollection RequestHeaders { get { return requestHeaders; } } ////// 获取或设置代理 /// public WebProxy Proxy { get { return proxy; } set { proxy = value; } } ////// 获取或设置请求与响应的文本编码方式 /// public Encoding Encoding { get { return encoding; } set { encoding = value; } } ////// 获取或设置响应的html代码 /// public string RespHtml { get { return respHtml; } set { respHtml = value; } } ////// 获取或设置与请求关联的Cookie容器 /// public CookieContainer CookieContainer { get { return cc; } set { cc = value; } } ////// 获取网页源代码 /// /// 网址 ///public string GetHtml(string url) { HttpWebRequest request = CreateRequest(url, "GET"); respHtml = encoding.GetString(GetData(request)); return respHtml; } /// /// 下载文件 /// /// 文件URL地址 /// 文件保存完整路径 public void DownloadFile(string url, string filename) { FileStream fs = null; try { HttpWebRequest request = CreateRequest(url, "GET"); byte[] data = GetData(request); fs = new FileStream(filename, FileMode.Create, FileAccess.Write); fs.Write(data, 0, data.Length); } finally { if (fs != null) fs.Close(); } } ////// 从指定URL下载数据 /// /// 网址 ///public byte[] GetData(string url) { HttpWebRequest request = CreateRequest(url, "GET"); return GetData(request); } /// /// 向指定URL发送文本数据 /// /// 网址 /// urlencode编码的文本数据 ///public string Post(string url, string postData) { byte[] data = encoding.GetBytes(postData); return Post(url, data); } /// /// 向指定URL发送字节数据 /// /// 网址 /// 发送的字节数组 ///public string Post(string url, byte[] postData) { HttpWebRequest request = CreateRequest(url, "POST"); request.ContentType = "application/x-www-form-urlencoded"; request.ContentLength = postData.Length; request.KeepAlive = true; PostData(request, postData); respHtml = encoding.GetString(GetData(request)); return respHtml; } /// /// 向指定网址发送mulitpart编码的数据 /// /// 网址 /// mulitpart form data ///public string Post(string url, MultipartForm mulitpartForm) { HttpWebRequest request = CreateRequest(url, "POST"); request.ContentType = mulitpartForm.ContentType; request.ContentLength = mulitpartForm.FormData.Length; request.KeepAlive = true; PostData(request, mulitpartForm.FormData); respHtml = encoding.GetString(GetData(request)); return respHtml; } /// /// 读取请求返回的数据 /// /// 请求对象 ///private byte[] GetData(HttpWebRequest request) { HttpWebResponse response = (HttpWebResponse)request.GetResponse(); Stream stream = response.GetResponseStream(); responseHeaders = response.Headers; //SaveCookiesToDisk(); DownloadEventArgs args = new DownloadEventArgs(); if (responseHeaders[HttpResponseHeader.ContentLength] != null) args.TotalBytes = Convert.ToInt32(responseHeaders[HttpResponseHeader.ContentLength]); MemoryStream ms = new MemoryStream(); int count = 0; byte[] buf = new byte[bufferSize]; while ((count = stream.Read(buf, 0, buf.Length)) > 0) { ms.Write(buf, 0, count); if (this.DownloadProgressChanged != null) { args.BytesReceived += count; args.ReceivedData = new byte[count]; Array.Copy(buf, args.ReceivedData, count); this.DownloadProgressChanged(this, args); } } stream.Close(); //解压 if (ResponseHeaders[HttpResponseHeader.ContentEncoding] != null) { MemoryStream msTemp = new MemoryStream(); count = 0; buf = new byte[100]; switch (ResponseHeaders[HttpResponseHeader.ContentEncoding].ToLower()) { case "gzip": GZipStream gzip = new GZipStream(ms, CompressionMode.Decompress); while ((count = gzip.Read(buf, 0, buf.Length)) > 0) { msTemp.Write(buf, 0, count); } return msTemp.ToArray(); case "deflate": DeflateStream deflate = new DeflateStream(ms, CompressionMode.Decompress); while ((count = deflate.Read(buf, 0, buf.Length)) > 0) { msTemp.Write(buf, 0, count); } return msTemp.ToArray(); default: break; } } return ms.ToArray(); } /// /// 发送请求数据 /// /// 请求对象 /// 请求发送的字节数组 private void PostData(HttpWebRequest request, byte[] postData) { int offset = 0; int sendBufferSize = bufferSize; int remainBytes = 0; Stream stream = request.GetRequestStream(); UploadEventArgs args = new UploadEventArgs(); args.TotalBytes = postData.Length; while ((remainBytes = postData.Length - offset) > 0) { if (sendBufferSize > remainBytes) sendBufferSize = remainBytes; stream.Write(postData, offset, sendBufferSize); offset += sendBufferSize; if (this.UploadProgressChanged != null) { args.BytesSent = offset; this.UploadProgressChanged(this, args); } } stream.Close(); } ////// 创建HTTP请求 /// /// URL地址 ///private HttpWebRequest CreateRequest(string url, string method) { Uri uri = new Uri(url); if (uri.Scheme == "https") ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(this.CheckValidationResult); // Set a default policy level for the "http:" and "https" schemes. HttpRequestCachePolicy policy = new HttpRequestCachePolicy(HttpRequestCacheLevel.Revalidate); HttpWebRequest.DefaultCachePolicy = policy; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri); request.AllowAutoRedirect = false; request.AllowWriteStreamBuffering = false; request.Method = method; if (proxy != null) request.Proxy = proxy; request.CookieContainer = cc; foreach (string key in requestHeaders.Keys) { request.Headers.Add(key, requestHeaders[key]); } requestHeaders.Clear(); return request; } private bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) { return true; } /// /// 将Cookie保存到磁盘 /// private static void SaveCookiesToDisk() { string cookieFile = System.Environment.GetFolderPath(Environment.SpecialFolder.Cookies) + "\\webclient.cookie"; FileStream fs = null; try { fs = new FileStream(cookieFile, FileMode.Create); System.Runtime.Serialization.Formatters.Binary.BinaryFormatter formater = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter(); formater.Serialize(fs, cc); } finally { if (fs != null) fs.Close(); } } ////// 从磁盘加载Cookie /// private static void LoadCookiesFromDisk() { cc = new CookieContainer(); string cookieFile = System.Environment.GetFolderPath(Environment.SpecialFolder.Cookies) + "\\webclient.cookie"; if (!File.Exists(cookieFile)) return; FileStream fs = null; try { fs = new FileStream(cookieFile, FileMode.Open, FileAccess.Read, FileShare.Read); System.Runtime.Serialization.Formatters.Binary.BinaryFormatter formater = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter(); cc = (CookieContainer)formater.Deserialize(fs); } finally { if (fs != null) fs.Close(); } } } ////// 对文件和文本数据进行Multipart形式的编码 /// public class MultipartForm { private Encoding encoding; private MemoryStream ms; private string boundary; private byte[] formData; ////// 获取编码后的字节数组 /// public byte[] FormData { get { if (formData == null) { byte[] buffer = encoding.GetBytes("--" + this.boundary + "--\r\n"); ms.Write(buffer, 0, buffer.Length); formData = ms.ToArray(); } return formData; } } ////// 获取此编码内容的类型 /// public string ContentType { get { return string.Format("multipart/form-data; boundary={0}", this.boundary); } } ////// 获取或设置对字符串采用的编码类型 /// public Encoding StringEncoding { set { encoding = value; } get { return encoding; } } ////// 实例化 /// public MultipartForm() { boundary = string.Format("--{0}--", Guid.NewGuid()); ms = new MemoryStream(); encoding = Encoding.Default; } ////// 添加一个文件 /// /// 文件域名称 /// 文件的完整路径 public void AddFlie(string name, string filename) { if (!File.Exists(filename)) throw new FileNotFoundException("尝试添加不存在的文件。", filename); FileStream fs = null; byte[] fileData = { }; try { fs = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read); fileData = new byte[fs.Length]; fs.Read(fileData, 0, fileData.Length); this.AddFlie(name, Path.GetFileName(filename), fileData, fileData.Length); } catch (Exception) { throw; } finally { if (fs != null) fs.Close(); } } ////// 添加一个文件 /// /// 文件域名称 /// 文件名 /// 文件二进制数据 /// 二进制数据大小 public void AddFlie(string name, string filename, byte[] fileData, int dataLength) { if (dataLength <= 0 || dataLength > fileData.Length) { dataLength = fileData.Length; } StringBuilder sb = new StringBuilder(); sb.AppendFormat("--{0}\r\n", this.boundary); sb.AppendFormat("Content-Disposition: form-data; name=\"{0}\";filename=\"{1}\"\r\n", name, filename); sb.AppendFormat("Content-Type: {0}\r\n", this.GetContentType(filename)); sb.Append("\r\n"); byte[] buf = encoding.GetBytes(sb.ToString()); ms.Write(buf, 0, buf.Length); ms.Write(fileData, 0, dataLength); byte[] crlf = encoding.GetBytes("\r\n"); ms.Write(crlf, 0, crlf.Length); } ////// 添加字符串 /// /// 文本域名称 /// 文本值 public void AddString(string name, string value) { StringBuilder sb = new StringBuilder(); sb.AppendFormat("--{0}\r\n", this.boundary); sb.AppendFormat("Content-Disposition: form-data; name=\"{0}\"\r\n", name); sb.Append("\r\n"); sb.AppendFormat("{0}\r\n", value); byte[] buf = encoding.GetBytes(sb.ToString()); ms.Write(buf, 0, buf.Length); } ////// 从注册表获取文件类型 /// /// 包含扩展名的文件名 ///如：application/stream private string GetContentType(string filename) { Microsoft.Win32.RegistryKey fileExtKey = null; ; string contentType = "application/stream"; try { fileExtKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(Path.GetExtension(filename)); contentType = fileExtKey.GetValue("Content Type", contentType).ToString(); } finally { if (fileExtKey != null) fileExtKey.Close(); } return contentType; } }
posted on 2017-11-24 16:22 阅读( ...) 评论( ...)