C# 向服务器上传文件（客服端winform、服务端web）

转载

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。

1. /// <summary>
2. /// 将本地文件上传到指定的服务器(HttpWebRequest方法)
3. /// </summary>
4. /// <param name="address">文件上传到的服务器</param>
5. /// <param name="fileNamePath">要上传的本地文件（全路径）</param>
6. /// <param name="saveName">文件上传后的名称</param>
7. /// <param name="progressBar">上传进度条</param>
8. /// <returns>成功返回1，失败返回0</returns>
9. private int Upload_Request2(string address, string fileNamePath, string saveName, ProgressBar progressBar)
10. {
11. int returnValue = 0;     // 要上传的文件
12. FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);
13. BinaryReader r = new BinaryReader(fs);     //时间戳
14. string strBoundary = "----------" + DateTime.Now.Ticks.ToString("x");
15. byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + strBoundary + "\r\n");     //请求头部信息
16. StringBuilder sb = new StringBuilder();
17. sb.Append("--");
18. sb.Append(strBoundary);
19. sb.Append("\r\n");
20. sb.Append("Content-Disposition: form-data; name=\"");
21. sb.Append("file");
22. sb.Append("\"; filename=\"");
23. sb.Append(saveName);
24. sb.Append("\";");
25. sb.Append("\r\n");
26. sb.Append("Content-Type: ");
27. sb.Append("application/octet-stream");
28. sb.Append("\r\n");
29. sb.Append("\r\n");
30. string strPostHeader = sb.ToString();
31. byte[] postHeaderBytes = Encoding.UTF8.GetBytes(strPostHeader);     // 根据uri创建HttpWebRequest对象
32. HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(new Uri(address));
33. httpReq.Method = "POST";     //对发送的数据不使用缓存
34. httpReq.AllowWriteStreamBuffering = false;     //设置获得响应的超时时间（300秒）
35. httpReq.Timeout = 300000;
36. httpReq.ContentType = "multipart/form-data; boundary=" + strBoundary;
37. long length = fs.Length + postHeaderBytes.Length + boundaryBytes.Length;
38. long fileLength = fs.Length;
39. httpReq.ContentLength = length;
40. try
41. {
42. progressBar.Maximum = int.MaxValue;
43. progressBar.Minimum = 0;
44. progressBar.Value = 0;
45. //每次上传4k
46. int bufferLength = 4096;
47. byte[] buffer = new byte[bufferLength]; //已上传的字节数
48. long offset = 0;         //开始上传时间
49. DateTime startTime = DateTime.Now;
50. int size = r.Read(buffer, 0, bufferLength);
51. Stream postStream = httpReq.GetRequestStream();         //发送请求头部消息
52. postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
53. while (size > 0)
54. {
55. postStream.Write(buffer, 0, size);
56. offset += size;
57. progressBar.Value = (int)(offset * (int.MaxValue / length));
58. TimeSpan span = DateTime.Now - startTime;
59. double second = span.TotalSeconds;
60. lblTime.Text = "已用时：" + second.ToString("F2") + "秒";
61. if (second > 0.001)
62. {
63. lblSpeed.Text = "平均速度：" + (offset / 1024 / second).ToString("0.00") + "KB/秒";
64. }
65. else
66. {
67. lblSpeed.Text = " 正在连接…";
68. }
69. lblState.Text = "已上传：" + (offset * 100.0 / length).ToString("F2") + "%";
70. lblSize.Text = (offset / 1048576.0).ToString("F2") + "M/" + (fileLength / 1048576.0).ToString("F2") + "M";
71. Application.DoEvents();
72. size = r.Read(buffer, 0, bufferLength);
73. }
74. //添加尾部的时间戳
75. postStream.Write(boundaryBytes, 0, boundaryBytes.Length);
76. postStream.Close();         //获取服务器端的响应
77. WebResponse webRespon = httpReq.GetResponse();
78. Stream s = webRespon.GetResponseStream();
79. //读取服务器端返回的消息
80. StreamReader sr = new StreamReader(s);
81. String sReturnString = sr.ReadLine();
82. s.Close();
83. sr.Close();
84. if (sReturnString == "Success")
85. {
86. returnValue = 1;
87. }
88. else if (sReturnString == "Error")
89. {
90. returnValue = 0;
91. }
92. }
93. catch
94. {
95. returnValue = 0;
96. }
97. finally
98. {
99. fs.Close();
100. r.Close();
101. } return returnValue;
102. }