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FTP作為日常工作學(xué)習(xí)中,，非常重要的一個(gè)文件傳輸存儲(chǔ)空間，想必大家都非常的熟悉了，那么如何快速的實(shí)現(xiàn)文件的上傳下載功能呢,，本文以一個(gè)簡(jiǎn)單的小例子，簡(jiǎn)述如何通過(guò)FluentFTP實(shí)現(xiàn)文件的上傳和下載功能。僅供學(xué)習(xí)分享使用,，如有不足之處，還請(qǐng)指正,。 FTP基礎(chǔ)知識(shí)
文件傳輸協(xié)議（File Transfer Protocol,，F(xiàn)TP）是用于在網(wǎng)絡(luò)上進(jìn)行文件傳輸?shù)囊惶讟?biāo)準(zhǔn)協(xié)議，它工作在 OSI 模型的第七層,， TCP 模型的第四層,， 即應(yīng)用層， 使用 TCP 傳輸而不是 UDP,， 客戶在和服務(wù)器建立連接前要經(jīng)過(guò)一個(gè)“三次握手”的過(guò)程,， 保證客戶與服務(wù)器之間的連接是可靠的， 而且是面向連接,， 為數(shù)據(jù)傳輸提供可靠保證,。FTP允許用戶以文件操作的方式（如文件的增、刪,、改,、查、傳送等）與另一主機(jī)相互通信,。然而,， 用戶并不真正登錄到自己想要存取的計(jì)算機(jī)上面而成為完全用戶， 可用FTP程序訪問(wèn)遠(yuǎn)程資源,， 實(shí)現(xiàn)用戶往返傳輸文件,、目錄管理以及訪問(wèn)電子郵件等等， 即使雙方計(jì)算機(jī)可能配有不同的操作系統(tǒng)和文件存儲(chǔ)方式,。 FTP環(huán)境搭建
在windows操作系統(tǒng)中,，F(xiàn)TP可以通過(guò)(Internet Inforamtion Services， IIS)管理器進(jìn)行創(chuàng)建,，創(chuàng)建成功后即可進(jìn)行查看,，如下所示：
FluentFTP安裝
FluentFTP是一款基于.Net的FTP和FTPS的客戶端動(dòng)態(tài)庫(kù),，操作簡(jiǎn)單便捷。 
首先創(chuàng)建基于.Net Framework 4.6.1的winform應(yīng)用程序,，然后通過(guò)Nuget包管理器進(jìn)行安裝,，如下所示：
示例演示
主要實(shí)現(xiàn)基于FTP的上傳，下載,，瀏覽等功能,，如下所示： 
進(jìn)入文件夾及右鍵下載，如下所示： 
示例源碼
FtpHelper類源碼,，封裝了FTP文件的檢索,，上傳，下載等功能,，如下所示： using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Net;using System.Text;using System.Threading;using System.Threading.Tasks;using FluentFTP;
namespace DemoFtp{ public class FtpHelper { #region 屬性與構(gòu)造函數(shù)
/// <summary> /// IP地址 /// </summary> public string IpAddr { get; set; }
/// <summary> /// 相對(duì)路徑 /// </summary> public string RelatePath { get; set; }
/// <summary> /// 端口號(hào) /// </summary> public int Port { get; set; }
/// <summary> /// 用戶名 /// </summary> public string UserName { get; set; }
/// <summary> /// 密碼 /// </summary> public string Password { get; set; }
public FtpHelper() {
}
public FtpHelper(string ipAddr, int port, string userName, string password, string relatePath) { this.IpAddr = ipAddr; this.Port = port; this.UserName = userName; this.Password = password; this.RelatePath = relatePath; }
#endregion
#region 方法
public FtpListItem[] ListDir() { FtpListItem[] lists; using (var ftpClient = new FtpClient(this.IpAddr, this.UserName, this.Password, this.Port)) { ftpClient.Connect(); ftpClient.SetWorkingDirectory(this.RelatePath); lists = ftpClient.GetListing(); } return lists; }
public void UpLoad(string dir, string file, out bool isOk) { isOk = false; FileInfo fi = new FileInfo(file); using (FileStream fs = fi.OpenRead()) { //long length = fs.Length; using (var ftpClient = new FtpClient(this.IpAddr, this.UserName, this.Password, this.Port)) { ftpClient.Connect(); ftpClient.SetWorkingDirectory(this.RelatePath); string remotePath = dir + "/" + Path.GetFileName(file); var ftpRemodeExistsMode = file.EndsWith(".txt") ? FtpRemoteExists.Overwrite : FtpRemoteExists.Skip; FtpStatus status = ftpClient.UploadStream(fs, remotePath, ftpRemodeExistsMode, true); isOk = status == FtpStatus.Success;
} }
}
/// <summary> /// 上傳多個(gè)文件 /// </summary> /// <param name="files"></param> /// <param name="isOk"></param> public void UpLoad(string dir, string[] files, out bool isOk) { isOk = false; if (CheckDirIsExists(dir)) { foreach (var file in files) { UpLoad(dir, file, out isOk); } } }
private bool CheckDirIsExists(string dir) { bool flag = false; using (var ftpClient = new FtpClient(this.IpAddr, this.UserName, this.Password, this.Port)) { ftpClient.Connect(); ftpClient.SetWorkingDirectory(this.RelatePath); flag = ftpClient.DirectoryExists(dir); if (!flag) { flag = ftpClient.CreateDirectory(dir); } } return flag;
}
/// <summary> /// 下載ftp /// </summary> /// <param name="localAddress"></param> /// <param name="remoteAddress"></param> /// <returns></returns> public bool DownloadFile(string localAddress, string remoteAddress) { using (var ftpClient = new FtpClient(this.IpAddr, this.UserName, this.Password, this.Port)) { ftpClient.SetWorkingDirectory("/"); ftpClient.Connect(); if (ftpClient.DownloadFile(localAddress, remoteAddress) == FtpStatus.Success) { return true; } return false; } }
#endregion }}
每一個(gè)FTP文件或文件夾,，由一個(gè)自定義用戶控件【PictureBox+Label+ContextMenu】表示，這樣便于處理與顯示： using DemoFtp.Properties;using FluentFTP;using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;
namespace DemoFtp{ public partial class FtpElementControl : UserControl { public Action<FtpListItem> SubFolderClick;
public Action<FtpListItem> DownLoadClick;
private FtpListItem ftpListItem;
public FtpElementControl(FtpListItem ftpListItem) { InitializeComponent(); this.ftpListItem = ftpListItem; }
public FtpElementControl() { InitializeComponent(); }
public void InitControl() { if (ftpListItem.Type == FtpObjectType.Directory) { this.pbIcon.Image = Resources.folder.ToBitmap(); } else if (ftpListItem.Type == FtpObjectType.File) { var name = ftpListItem.Name; var ext = Path.GetExtension(name).ToLower().Substring(1); if (ext == "png" || ext == "jpeg" || ext == "jpg" || ext == "bmp" || ext == "gif") { this.pbIcon.Image = Resources.pictures.ToBitmap(); } else if (ext == "doc" || ext == "docx") { this.pbIcon.Image = Resources.doc.ToBitmap(); } else if (ext == "exe") { this.pbIcon.Image = Resources.setup.ToBitmap(); } else { this.pbIcon.Image = Resources.file; } } else { this.pbIcon.Image = Resources.file; } this.lblName.Text = ftpListItem.Name; }
private void FtpElementControl_Load(object sender, EventArgs e) {
}
/// <summary> /// 子菜單下載功能 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void menu_ItemClicked(object sender, ToolStripItemClickedEventArgs e) { this.DownLoadClick?.Invoke(ftpListItem); }
/// <summary> /// 雙擊打開 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void pbIcon_DoubleClick(object sender, EventArgs e) { this.SubFolderClick?.Invoke(ftpListItem); } }}
主頁(yè)面由一系列用戶操作框和按鈕組成,，完成對(duì)FTP的基本操作,，如下所示： using FluentFTP;using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;
namespace DemoFtp{ public partial class MainForm : Form { private FtpHelper ftpHelper;
public MainForm() { InitializeComponent(); }
private void btnLogin_Click(object sender, EventArgs e) { var url = txtFtpUrl.Text; var userName = txtUserName.Text; var password = txtPassword.Text; var port = txtPort.Text; if (this.lblRelatePath.Text != "/") { this.lblRelatePath.Text = "/"; } var relatePath = this.lblRelatePath.Text; if (string.IsNullOrEmpty(url) || string.IsNullOrEmpty(userName) || string.IsNullOrEmpty(password) || string.IsNullOrEmpty(port)) { MessageBox.Show("路徑和賬號(hào)密碼不可為空"); return; } if (ftpHelper == null) { ftpHelper = new FtpHelper(url, int.Parse(port), userName, password, relatePath);
} ListDir(); }
public void SubFolder(FtpListItem ftpListItem) { if (ftpListItem.Type == FtpObjectType.Directory) { var fullName = ftpListItem.FullName; ftpHelper.RelatePath = fullName; ListDir(); this.lblRelatePath.Text = fullName; } }
private void Download(FtpListItem ftpListItem) { var fullName=ftpListItem.FullName; var fileName = Path.GetFileName(fullName); SaveFileDialog sfd = new SaveFileDialog(); sfd.FileName = fileName; sfd.Title = "下載"; sfd.Filter = "所有文檔|*.*"; if (DialogResult.OK == sfd.ShowDialog()) { ftpHelper.DownloadFile(sfd.FileName, fullName); } }
private void ListDir() { this.ftpContainer.Controls.Clear(); var ftpListItems = this.ftpHelper.ListDir(); if (ftpListItems != null && ftpListItems.Length > 0) { foreach (var ftpListItem in ftpListItems) { FtpElementControl ftpControl = new FtpElementControl(ftpListItem); ftpControl.InitControl(); ftpControl.DownLoadClick += Download; ftpControl.SubFolderClick += SubFolder; this.ftpContainer.Controls.Add(ftpControl); } } }
private void btnUpload_Click(object sender, EventArgs e) { OpenFileDialog ofd = new OpenFileDialog(); ofd.Filter = "所有文件|*.*"; ofd.Title = "請(qǐng)選擇需要上傳的文件"; if (DialogResult.OK == ofd.ShowDialog()) { var localFile=ofd.FileName; ftpHelper.UpLoad(this.lblRelatePath.Text, localFile, out bool isOk); if (isOk) { ListDir(); } } }
private void pbReturn_Click(object sender, EventArgs e) { var relativePath=this.lblRelatePath.Text; if (relativePath == "/") { return; } relativePath = relativePath.Substring(0, relativePath.LastIndexOf("/")+1); ftpHelper.RelatePath=relativePath; ListDir(); this.lblRelatePath.Text = relativePath; } }}
以上就是基于FluentFTP實(shí)現(xiàn)FTP上傳下載的全部?jī)?nèi)容，旨在拋磚引玉,，共同學(xué)習(xí),，一起進(jìn)步。
學(xué)習(xí)編程,，從關(guān)注【老碼識(shí)途】開始?。?！ 
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