c＃搭建ftp服务器并实现文件上传和下载

搭建ftp服务器并实现文件上传和下载

1、建立窗体

2、引入命名空间

windows系统搭建FTP服务器教程，参考下面链接
感谢本文链接作者：https://blog.csdn.net/weixin_43908647/article/details/113140942;

3、具体代码如下：

 public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
		//windows系统搭建FTP服务器教程，参考下面链接
        //感谢本文链接作者：https://blog.csdn.net/weixin_43908647/article/details/113140942;  

        string FTPAddress = "ftp://***.***.***.***:21"; //ftp服务器地址
        string FTPUsername = "******";   //ftp服务器用户名
        string FTPPwd = "******";//ftp服务器密码
        //上传文件
        private void button1_Click(object sender, EventArgs e)
        {
            string LocalPath = "d:\\ftp\\a.txt"; //待上传文件
            FileInfo f = new FileInfo(LocalPath);
            string FileName = f.Name;
            string FTPPath = FTPAddress + "/" + FileName; //
            //实现文件传输协议 (FTP) 客户端
            FtpWebRequest reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(FTPPath));
            reqFtp.UseBinary = true;
            reqFtp.Credentials = new NetworkCredential(FTPUsername, FTPPwd); //设置通信凭据,输入ftp服务器用户名和密码
            reqFtp.KeepAlive = false; //请求完成后关闭ftp连接
            reqFtp.Method = WebRequestMethods.Ftp.UploadFile;//调用上传方法
            reqFtp.ContentLength = f.Length;
            int buffLength = 2048;
            byte[] buff = new byte[buffLength];
            int contentLen;
            //读本地文件数据并上传
            FileStream fs = f.OpenRead();
            try
            {
                Stream strm = reqFtp.GetRequestStream();
                contentLen = fs.Read(buff, 0, buffLength);
                while (contentLen != 0)
                {
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);
                }
                strm.Close();
                fs.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show("上传失败", ex.Message.ToString());
            }
        }
        //下载文件
        private void button2_Click(object sender, EventArgs e)
        {
            string FtpFilePath = "/a.txt";   //远程路径"  "ftp://***.***.***.***:21"; //ftp服务器地址

            try
            {
                string LocalPath = "d:\\ftp\\a.txt"; //下载到的本地路径
                MessageBox.Show(LocalPath);
                if (File.Exists(LocalPath))//判断需要下载的文件是否存在，
                {
                    File.Delete(LocalPath);//如果文件存在，就删掉
                }
                string FTPPath = FTPAddress + FtpFilePath;//原创 ，此处为服务器的存放文件路径（FTPAddress） +需要下载的文件名字（FtpFilePath）
                //string FTPPath = FTPAddress + "/" + LocalPath;
                MessageBox.Show(FTPPath);
                //建立ftp连接
                FtpWebRequest reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(FTPPath));
                reqFtp.UseBinary = true;
                reqFtp.Credentials = new NetworkCredential(FTPUsername, FTPPwd);
                FtpWebResponse response = (FtpWebResponse)reqFtp.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                long cl = response.ContentLength;
                int buffersize = 2048;
                int readCount;
                byte[] buffer = new byte[buffersize];
                readCount = ftpStream.Read(buffer, 0, buffersize);
                //创建并写入文件
                FileStream OutputStream = new FileStream(LocalPath, FileMode.Create);
                while (readCount > 0)
                {
                    OutputStream.Write(buffer, 0, buffersize);
                    readCount = ftpStream.Read(buffer, 0, buffersize);
                }
                ftpStream.Close();
                OutputStream.Close();
                response.Close();
                if (File.Exists(LocalPath))
                    MessageBox.Show("下载完毕");

            }
            catch (Exception ex)
            {

                MessageBox.Show(ex.Message.ToString());
            }
        }
    }
}