C# 向服务器上传文件(客服端winform、服务端web)

时间:2022-08-28 22:23:12

首先写客服端,winform模拟一个post提交:

/// <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_Request2(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();
                //读取服务器端返回的消息
                StreamReader sr = new StreamReader(s);          
                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 = "C:\\Documents and Settings\\Administrator\\桌面\\2\\" + file.FileName;//this.MapPath("UploadDocument")
                string filePath = "D:\\SourceSafe\\testupform\\" + file.FileName;
                file.SaveAs(filePath);
                Response.Write("Success");
            }
            catch
            {
                Response.Write("Error");
            }
        }
        else
        {
            Response.Write("Error1");
        }

    }
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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