WinForm下使用HttpWebRequest上传文件并显示进度代码,CSharp代码库,德仔网

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【CSharp】 WinForm下使用HttpWebRequest上传文件并显示进度

作者:dezai / 发布于2014/2/9/ 1307

WinForm下使用HttpWebRequest上传文件并显示进度


/// <summary>
/// 将本地文件上传到指定的服务器(HttpWebRequest方法)
/// </summary>
/// <param name="address">文件上传到的服务器</param>
/// <param name="fileNamePath">要上传的本地文件（全路径）</param>
/// <param name="saveName">文件上传后的名称</param>
/// <param name="progressBar">上传进度条</param>
/// <returns>成功返回1，失败返回0</returns>
private int Upload_Request(string address, string fileNamePath, string saveName, ProgressBar progressBar)
{
 int returnValue = 0;
 // 要上传的文件
 FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);
 BinaryReader r = new BinaryReader(fs);
 //时间戳
 string strBoundary = "----------" + DateTime.Now.Ticks.ToString("x");
 byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + strBoundary + "\r\n");
 //请求头部信息
 StringBuilder sb = new StringBuilder();
 sb.Append("--");
 sb.Append(strBoundary);
 sb.Append("\r\n");
 sb.Append("Content-Disposition: form-data; name=\"");
 sb.Append("file");
 sb.Append("\"; filename=\"");
 sb.Append(saveName);
 sb.Append("\"");
 sb.Append("\r\n");
 sb.Append("Content-Type: ");
 sb.Append("application/octet-stream");
 sb.Append("\r\n");
 sb.Append("\r\n");
 string strPostHeader = sb.ToString();
 byte[] postHeaderBytes = Encoding.UTF8.GetBytes(strPostHeader);
 // 根据uri创建HttpWebRequest对象
 HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(new Uri(address));
 httpReq.Method = "POST";
 //对发送的数据不使用缓存
 httpReq.AllowWriteStreamBuffering = false;
 //设置获得响应的超时时间（300秒）
 httpReq.Timeout = 300000;
 httpReq.ContentType = "multipart/form-data; boundary=" + strBoundary;
 long length = fs.Length + postHeaderBytes.Length + boundaryBytes.Length;
 long fileLength = fs.Length;
 httpReq.ContentLength = length;
 try
 {
 progressBar.Maximum = int.MaxValue;
 progressBar.Minimum = 0;
 progressBar.Value = 0;
 //每次上传4k
 int bufferLength = 4096;
 byte[] buffer = new byte[bufferLength];
 //已上传的字节数
 long offset = 0;
 //开始上传时间
 DateTime startTime = DateTime.Now;
 int size = r.Read(buffer, 0, bufferLength);
 Stream postStream = httpReq.GetRequestStream();
 //发送请求头部消息
 postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
 while (size > 0)
 {
 postStream.Write(buffer, 0, size);
 offset += size;
 progressBar.Value = (int)(offset * (int.MaxValue / length));
 TimeSpan span = DateTime.Now - startTime;
 double second = span.TotalSeconds;
 lblTime.Text = "已用时：" + second.ToString("F2") + "秒";
 if (second > 0.001)
 {
 lblSpeed.Text = " 平均速度：" + (offset / 1024 / second).ToString("0.00") + "KB/秒";
 }
 else
 {
 lblSpeed.Text = " 正在连接&hellip;";
 }
 lblState.Text = "已上传：" + (offset * 100.0 / length).ToString("F2") + "%";
 lblSize.Text = (offset / 1048576.0).ToString("F2") + "M/" + (fileLength / 1048576.0).ToString("F2") + "M";
 Application.DoEvents();
 size = r.Read(buffer, 0, bufferLength);
 }
 //添加尾部的时间戳
 postStream.Write(boundaryBytes, 0, boundaryBytes.Length);
 postStream.Close();
 //获取服务器端的响应
 WebResponse webRespon = httpReq.GetResponse();
 Stream s = webRespon.GetResponseStream();
 StreamReader sr = new StreamReader(s);
 //读取服务器端返回的消息
 String sReturnString = sr.ReadLine();
 s.Close();
 sr.Close();
 if (sReturnString == "Success")
 {
 returnValue = 1;
 }
 else if (sReturnString == "Error")
 {
 returnValue = 0;
 }
 }
 catch
 {
 returnValue = 0;
 }
 finally
 {
 fs.Close();
 r.Close();
 }
 return returnValue;
}
参数说明如下：
address：接收文件的URL地址，如：http://localhost/UploadFile/default.aspx
fileNamePath：要上传的本地文件，如：D:\test.rar
saveName：文件上传到服务器后的名称，如：200901011234.rar
progressBar：显示文件上传进度的进度条。
接收文件的WebForm添加一个Save.aspx页面，Load方法如下：
protected void Page_Load(object sender, EventArgs e)
{
 if (Request.Files.Count > 0)
 {
 try
 {
 HttpPostedFile file = Request.Files[0];
 string filePath = this.MapPath("UploadDocument") + "\\" + file.FileName;
 file.SaveAs(filePath);
 Response.Write("Success\r\n");
 }
 catch
 {
 Response.Write("Error\r\n");
 }
 }
}
同时需要配置WebConfig文件的httpRuntime 如下：
<httpRuntime maxRequestLength="102400" executionTimeout="300"/>
不能的话最大只能上传4M了。要是想上传更大的文件，maxRequestLength，executionTimeout设置大些，同时WinForm下的代码行
//设置获得响应的超时时间（300秒）
httpReq.Timeout = 300000;

也要修改，另外别忘了看看IIS的连接超时是否设置为足够大。

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