本文是利用C# 實現FTP客戶端的小例子，主要實現上傳，下載，刪除等功能，以供學習分享使用。
思路：
通過讀取FTP站點的目錄信息，列出對應的文件及文件夾。
雙擊目錄，則顯示子目錄，如果是文件，則點擊右鍵，進行下載和刪除操作。
通過讀取本地電腦的目錄，以樹狀結構展示，選擇本地文件，右鍵進行上傳操作。
涉及知識點：
FtpWebRequest【實現文件傳輸協議 (FTP) 客戶端】 / FtpWebResponse【封裝文件傳輸協議 (FTP) 服務器對請求的響應】Ftp的操作主要集中在兩個類中。
FlowLayoutPanel 【流布局面板】表示一個沿水平或垂直方向動態排放其內容的面板。
ContextMenuStrip 【快捷菜單】 主要用于右鍵菜單。
資源文件：Resources 用于存放圖片及其他資源。
效果圖如下
左邊：雙擊文件夾進入子目錄，點擊工具欄按鈕‘上級目錄'返回。文件點擊右鍵進行操作。
右邊：文件夾則點擊前面+號展開。文件則點擊右鍵進行上傳。
核心代碼如下
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;
namespace FtpClient
{
public class FtpHelper
{
#region 屬性與構造函數
/// <summary>
/// IP地址
/// </summary>
public string IpAddr { get; set; }
/// <summary>
/// 相對路徑
/// </summary>
public string RelatePath { get; set; }
/// <summary>
/// 端口號
/// </summary>
public string 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, string port, string userName, string password) {
this.IpAddr = ipAddr;
this.Port = port;
this.UserName = userName;
this.Password = password;
}
#endregion
#region 方法
/// <summary>
/// 下載文件
/// </summary>
/// <param name="filePath"></param>
/// <param name="isOk"></param>
public void DownLoad(string filePath, out bool isOk) {
string method = WebRequestMethods.Ftp.DownloadFile;
var statusCode = FtpStatusCode.DataAlreadyOpen;
FtpWebResponse response = callFtp(method);
ReadByBytes(filePath, response, statusCode, out isOk);
}
public void UpLoad(string file,out bool isOk)
{
isOk = false;
FileInfo fi = new FileInfo(file);
FileStream fs = fi.OpenRead();
long length = fs.Length;
string uri = string.Format("ftp://{0}:{1}{2}", this.IpAddr, this.Port, this.RelatePath);
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(uri);
request.Credentials = new NetworkCredential(UserName, Password);
request.Method = WebRequestMethods.Ftp.UploadFile;
request.UseBinary = true;
request.ContentLength = length;
request.Timeout = 10 * 1000;
try
{
Stream stream = request.GetRequestStream();
int BufferLength = 2048; //2K
byte[] b = new byte[BufferLength];
int i;
while ((i = fs.Read(b, 0, BufferLength)) > 0)
{
stream.Write(b, 0, i);
}
stream.Close();
stream.Dispose();
isOk = true;
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
finally {
if (request != null)
{
request.Abort();
request = null;
}
}
}
/// <summary>
/// 刪除文件
/// </summary>
/// <param name="isOk"></param>
/// <returns></returns>
public string[] DeleteFile(out bool isOk) {
string method = WebRequestMethods.Ftp.DeleteFile;
var statusCode = FtpStatusCode.FileActionOK;
FtpWebResponse response = callFtp(method);
return ReadByLine(response, statusCode, out isOk);
}
/// <summary>
/// 展示目錄
/// </summary>
public string[] ListDirectory(out bool isOk)
{
string method = WebRequestMethods.Ftp.ListDirectoryDetails;
var statusCode = FtpStatusCode.DataAlreadyOpen;
FtpWebResponse response= callFtp(method);
return ReadByLine(response, statusCode, out isOk);
}
/// <summary>
/// 設置上級目錄
/// </summary>
public void SetPrePath()
{
string relatePath = this.RelatePath;
if (string.IsNullOrEmpty(relatePath) || relatePath.LastIndexOf("/") == 0 )
{
relatePath = "";
}
else {
relatePath = relatePath.Substring(0, relatePath.LastIndexOf("/"));
}
this.RelatePath = relatePath;
}
#endregion
#region 私有方法
/// <summary>
/// 調用Ftp,將命令發往Ftp并返回信息
/// </summary>
/// <param name="method">要發往Ftp的命令</param>
/// <returns></returns>
private FtpWebResponse callFtp(string method)
{
string uri = string.Format("ftp://{0}:{1}{2}", this.IpAddr, this.Port, this.RelatePath);
FtpWebRequest request; request = (FtpWebRequest)FtpWebRequest.Create(uri);
request.UseBinary = true;
request.UsePassive = true;
request.Credentials = new NetworkCredential(UserName, Password);
request.KeepAlive = false;
request.Method = method;
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
return response;
}
/// <summary>
/// 按行讀取
/// </summary>
/// <param name="response"></param>
/// <param name="statusCode"></param>
/// <param name="isOk"></param>
/// <returns></returns>
private string[] ReadByLine(FtpWebResponse response, FtpStatusCode statusCode,out bool isOk) {
List<string> lstAccpet = new List<string>();
int i = 0;
while (true)
{
if (response.StatusCode == statusCode)
{
using (StreamReader sr = new StreamReader(response.GetResponseStream()))
{
string line = sr.ReadLine();
while (!string.IsNullOrEmpty(line))
{
lstAccpet.Add(line);
line = sr.ReadLine();
}
}
isOk = true;
break;
}
i++;
if (i > 10)
{
isOk = false;
break;
}
Thread.Sleep(200);
}
response.Close();
return lstAccpet.ToArray();
}
private void ReadByBytes(string filePath,FtpWebResponse response, FtpStatusCode statusCode, out bool isOk)
{
isOk = false;
int i = 0;
while (true)
{
if (response.StatusCode == statusCode)
{
long length = response.ContentLength;
int bufferSize = 2048;
int readCount;
byte[] buffer = new byte[bufferSize];
using (FileStream outputStream = new FileStream(filePath, FileMode.Create))
{
using (Stream ftpStream = response.GetResponseStream())
{
readCount = ftpStream.Read(buffer, 0, bufferSize);
while (readCount > 0)
{
outputStream.Write(buffer, 0, readCount);
readCount = ftpStream.Read(buffer, 0, bufferSize);
}
}
}
break;
}
i++;
if (i > 10)
{
isOk = false;
break;
}
Thread.Sleep(200);
}
response.Close();
}
#endregion
}
/// <summary>
/// Ftp內容類型枚舉
/// </summary>
public enum FtpContentType
{
undefined = 0,
file = 1,
folder = 2
}
}
源碼鏈接如下：案例
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持億速云。
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