C# 编程WinForm 上传文件到 Asp.Net 的 Web项目

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在做WinForm时，需要WinForm同Web进行交互，有时需要进行图片、文件的上传操作.

 

WinForm的代码如下：

 

private void button2_Click(object sender, EventArgs e)
        {
            // string a = MyUploader(this.textBox1.Text.Trim(), @"http://localhost:4451/TEST/Default.aspx");

            string a = MyUploader(this.textBox1.Text.Trim(), @"http://localhost/release/Default.aspx");

          MessageBox.Show(a);
        }


        public static string MyUploader(string strFileToUpload, string strUrl)
        {
            string strFileFormName = "file";
            Uri oUri = new Uri(strUrl);
            string strBoundary = "----------" + DateTime.Now.Ticks.ToString("x");

            // The trailing boundary string
            byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + strBoundary + "\r\n");

            // The post message header
            StringBuilder sb = new StringBuilder();
            sb.Append("--");
            sb.Append(strBoundary);
            sb.Append("\r\n");
            sb.Append("Content-Disposition: form-data; name=\"");
            sb.Append(strFileFormName);
            sb.Append("\"; filename=\"");
            sb.Append(Path.GetFileName(strFileToUpload));
            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);

            // The WebRequest
            HttpWebRequest oWebrequest = (HttpWebRequest)WebRequest.Create(oUri);
            oWebrequest.ContentType = "multipart/form-data; boundary=" + strBoundary;
            oWebrequest.Method = "POST";

            // This is important, otherwise the whole file will be read to memory anyway...
            oWebrequest.AllowWriteStreamBuffering = false;

            // Get a FileStream and set the final properties of the WebRequest
            FileStream oFileStream = new FileStream(strFileToUpload, FileMode.Open, FileAccess.Read);
            long length = postHeaderBytes.Length + oFileStream.Length + boundaryBytes.Length;
            oWebrequest.ContentLength = length;
            Stream oRequestStream = oWebrequest.GetRequestStream();

            // Write the post header
            oRequestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);

            // Stream the file contents in small pieces (4096 bytes, max).
            byte[] buffer = new Byte[checked((uint)Math.Min(4096, (int)oFileStream.Length))];
            int bytesRead = 0;
            while ((bytesRead = oFileStream.Read(buffer, 0, buffer.Length)) != 0)
                oRequestStream.Write(buffer, 0, bytesRead);
            oFileStream.Close();

            // Add the trailing boundary
            oRequestStream.Write(boundaryBytes, 0, boundaryBytes.Length);
            WebResponse oWResponse = oWebrequest.GetResponse();
            Stream s = oWResponse.GetResponseStream();
            StreamReader sr = new StreamReader(s);
            String sReturnString = sr.ReadToEnd();
            Console.WriteLine(sReturnString);
            // Clean up
            oFileStream.Close();
            oRequestStream.Close();
            s.Close();
            sr.Close();

            return sReturnString;
        }

 

在按钮点击时，便会触发提交操作，Web的Default.aspx代码如下：

 

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.Files.Count > 0)
        {
            try
            {
                HttpPostedFile file = Request.Files[0];
                string filePath = this.MapPath("FileUpload") + "\\" + file.FileName;
                file.SaveAs(filePath);

                Response.Write("成功了");
     
            }
            catch (Exception)
            {

                Response.Write("失败了1");
            }
        }
        else
        {
            Response.Write("失败了2");
        }

        Response.End();
    }
}

 

 

这样，便可以将文件通过winform 上传到web 服务器上。

 

如果服务器端是Java的Web，则可以借助SmartUpload组件，Java端上传的Servlet如下：

 

package com.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.jspsmart.upload.Files;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;

public class UpLoad extends HttpServlet {


	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		try {
			SmartUpload mySmartUpload = new SmartUpload();
			mySmartUpload.initialize(getServletConfig(), request, response);
			mySmartUpload.upload();
			Files files = mySmartUpload.getFiles();
			int num = files.getCount();
			for (int i = 0; i < num; i++) {
				com.jspsmart.upload.File myfile = files.getFile(i);
				String fileName = myfile.getFileName();
                                fileName = new String(fileName.getBytes(), "UTF-8");//强转成UTF8不然中文文件名会是乱码
                                myfile.saveAs("/upload/" + fileName, i + 1);
			}
			String ret = "OK";
			byte[] rep = ret.getBytes();
			response.getOutputStream().write(rep);
		} catch (SmartUploadException e) {
			e.printStackTrace();
		}
	}
}

 

 

至此，WinForm上传文件到Web项目，服务器端为.Net和Java的，均可以使用。

 

 

 

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