(总结3)WinForm中文件上传服务器：HttpWebRequest

本文主要是介绍(总结3)WinForm中文件上传服务器：HttpWebRequest，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

转：http://blog.csdn.net/shihuan10430049/article/details/3734398

因项目需要，要实现WinForm下的文件上传，个人觉得采用FTP方法太麻烦，还得配置FTP服务器，要通过防火墙也是一个麻烦。本来打算采用WebClient方法，但是采用这个方法实现后，进度条很短时间后就达到最大值，要等待一段时间才能传送完毕，要是文件太大（我这里测试约100M），会出现错误。后来才知道，原来WebClient是在加载完整个文件到内存后才真正开始上传，怪不得会出现前面的问题了。不得已参考了很多文章，老外的一个文章对我启发很大（http://blogs.msdn.com/johan/archive/2006/11/15/are-you-getting-outofmemoryexceptions-when-uploading-large-files.aspx），是采用HttpWebRequest方法实现的。废话少说，开始进入正题。实现过程如下：

在WinForm里面调用下面的方法来上传文件：

参数说明如下：

address：接收文件的URL地址，如：http://localhost/UploadFile/Save.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。

  /// <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>
  public int UploadFile(string address, string fileNamePath, string saveName, ProgressBarControl 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\nContent-Disposition: form-data; name=\"file\"; filename=\"");
   sb.Append(saveName);
   sb.Append("\"\r\nContent-Type: ");
   sb.Append("application/octet-stream");
   sb.Append("\r\n\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.Properties.Maximum = int.MaxValue;
                       progressBar.Properties.Minimum = 0;
                       progressBar.EditValue = 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);

                using (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);文件的内容

                         offset += size;
                         progressBar.EditValue = (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…";
                         }
                         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";
                         System.Windows.Forms.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;
         }

调用：

  /// <summary>
  /// HttpWebRequest上传
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void btnUpload_Click(object sender, EventArgs e)
  {
   try
   {
    string iniPath = DataConvert.ToString(btnOpenDialog.EditValue);
    if (iniPath.Length == 0)
    {
     XtraMessageBox.Show("请选择要上传的文件！");
     return;
    }
    panelJD.Visible = true;

    string address = string.Format("{0}Save.aspx", Core.CoreOption.WsAddressErp);

int rst = UploadFile(address, iniPath, "dd.rar", progressBarControl1);

   }
   catch (Exception err)
   {
    XtraMessageBox.Show(err.Message);
   }
  }

aspx文件：

  protected void Page_Load(object sender, EventArgs e)
  {
   // 在此处放置用户代码以初始化页面
    try
    {
     if (Request.Files.Count > 0)
     {
      foreach (string f in Request.Files.AllKeys)
      {
       HttpPostedFile file = Request.Files[f];
       string filePath = @"D:\Temp\" + file.FileName;
       //string p= this.MapPath("test") + "//" + file.FileName;
       file.SaveAs(filePath);
       Response.Write("Success/r/n");
      }
     }
    }
    catch
    {
     Response.Write("Error/r/n");
    }

  }