c#winform+aspx上传大文件到服务器---示例(转载)
本文转载自http://blog.csdn.net/shihuan10430049/article/details/3734398
这段时间因项目需要,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:
- // <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…";
- }
- 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/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。
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。
一切都配置好了,运行效果如下:
为了解决这个问题,我查看了很多文章,记于此,以后遇到同样的问题有个查找的地方。