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C# 向服务器上传文件(客服端winform、服务端web)

2017-02-25 13:47 459 查看
首先写客服端,winform模拟一个post提交:

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/// <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:

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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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