c#通过ftp下载文件

c#通过ftp下载文件，借用了两位大神的代码
http://www.cnblogs.com/rond/archive/2012/07/30/2611295.html

http://blog.csdn.net/csethcrm/article/details/8139744

感谢
在这做下记录

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;//ftp类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using System.Threading;using FtpSyn;namespace FtpSyn
{public class FtpHelper{//基本设置static private string path = @"ftp://" + "192.168.1.103" + "/";    //目标路径static private string ftpip = "192.168.1.103";    //ftp IP地址static private string username = "root";   //ftp用户名static private string password = "";   //ftp密码//获取ftp上面的文件和文件夹public static string[] GetFileList(string dir){string[] downloadFiles;StringBuilder result = new StringBuilder();FtpWebRequest request;try{request = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));request.UseBinary = true;request.Credentials = new NetworkCredential(username, password);//设置用户名和密码request.Method = WebRequestMethods.Ftp.ListDirectory;request.UseBinary = true;WebResponse response = request.GetResponse();StreamReader reader = new StreamReader(response.GetResponseStream());string line = reader.ReadLine();while (line != null){result.Append(line);result.Append("\n");Console.WriteLine(line);line = reader.ReadLine();}// to remove the trailing '\n'result.Remove(result.ToString().LastIndexOf('\n'), 1);reader.Close();response.Close();return result.ToString().Split('\n');}catch (Exception ex){Console.WriteLine("获取ftp上面的文件和文件夹：" + ex.Message);downloadFiles = null;return downloadFiles;}}/// <summary>/// 获取文件大小/// </summary>/// <param name="file">ip服务器下的相对路径</param>/// <returns>文件大小</returns>public static int GetFileSize(string file){StringBuilder result = new StringBuilder();FtpWebRequest request;try{request = (FtpWebRequest)FtpWebRequest.Create(new Uri(path + file));request.UseBinary = true;request.Credentials = new NetworkCredential(username, password);//设置用户名和密码request.Method = WebRequestMethods.Ftp.GetFileSize;int dataLength = (int)request.GetResponse().ContentLength;return dataLength;}catch (Exception ex){Console.WriteLine("获取文件大小出错：" + ex.Message);return -1;}}/// <summary>/// 文件上传/// </summary>/// <param name="filePath">原路径（绝对路径）包括文件名</param>/// <param name="objPath">目标文件夹：服务器下的相对路径 不填为根目录</param>public static void FileUpLoad(string filePath, string objPath = ""){try{string url = path;if (objPath != "")url += objPath + "/";try{FtpWebRequest reqFTP = null;//待上传的文件 （全路径）try{FileInfo fileInfo = new FileInfo(filePath);using (FileStream fs = fileInfo.OpenRead()){long length = fs.Length;reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url + fileInfo.Name));//设置连接到FTP的帐号密码reqFTP.Credentials = new NetworkCredential(username, password);//设置请求完成后是否保持连接reqFTP.KeepAlive = false;//指定执行命令reqFTP.Method = WebRequestMethods.Ftp.UploadFile;//指定数据传输类型reqFTP.UseBinary = true;using (Stream stream = reqFTP.GetRequestStream()){//设置缓冲大小int BufferLength = 5120;byte[] b = new byte[BufferLength];int i;while ((i = fs.Read(b, 0, BufferLength)) > 0){stream.Write(b, 0, i);}Console.WriteLine("上传文件成功");}}}catch (Exception ex){Console.WriteLine("上传文件失败错误为" + ex.Message);}finally{}}catch (Exception ex){Console.WriteLine("上传文件失败错误为" + ex.Message);}finally{}}catch (Exception ex){Console.WriteLine("上传文件失败错误为" + ex.Message);}}/// <summary>/// 删除文件/// </summary>/// <param name="fileName">服务器下的相对路径 包括文件名</param>public static void DeleteFileName(string fileName){try{FileInfo fileInf = new FileInfo(ftpip + "" + fileName);string uri = path + fileName;FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));// 指定数据传输类型reqFTP.UseBinary = true;// ftp用户名和密码reqFTP.Credentials = new NetworkCredential(username, password);// 默认为true，连接不会被关闭// 在一个命令之后被执行reqFTP.KeepAlive = false;// 指定执行什么命令reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();response.Close();}catch (Exception ex){Console.WriteLine("删除文件出错：" + ex.Message);}}/// <summary>/// 新建目录 上一级必须先存在/// </summary>/// <param name="dirName">服务器下的相对路径</param>public static void MakeDir(string dirName){try{string uri = path + dirName;FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));// 指定数据传输类型reqFTP.UseBinary = true;// ftp用户名和密码reqFTP.Credentials = new NetworkCredential(username, password);reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();response.Close();}catch (Exception ex){Console.WriteLine("创建目录出错：" + ex.Message);}}/// <summary>/// 删除目录 上一级必须先存在/// </summary>/// <param name="dirName">服务器下的相对路径</param>public static void DelDir(string dirName){try{string uri = path + dirName;FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));// ftp用户名和密码reqFTP.Credentials = new NetworkCredential(username, password);reqFTP.Method = WebRequestMethods.Ftp.RemoveDirectory;FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();response.Close();}catch (Exception ex){Console.WriteLine("删除目录出错：" + ex.Message);}}/// <summary>/// 从ftp服务器上获得文件夹列表/// </summary>/// <param name="RequedstPath">服务器下的相对路径</param>/// <returns></returns>public static List<string> GetDirctory(string RequedstPath){List<string> strs = new List<string>();try{string uri = path + RequedstPath;   //目标路径 path为服务器地址FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));// ftp用户名和密码reqFTP.Credentials = new NetworkCredential(username, password);reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;WebResponse response = reqFTP.GetResponse();StreamReader reader = new StreamReader(response.GetResponseStream());//中文文件名string line = reader.ReadLine();while (line != null){if (line.Contains("<DIR>")){string msg = line.Substring(line.LastIndexOf("<DIR>") + 5).Trim();strs.Add(msg);}line = reader.ReadLine();}reader.Close();response.Close();return strs;}catch (Exception ex){Console.WriteLine("获取目录出错：" + ex.Message);}return strs;}/// <summary>/// 从ftp服务器上获得文件列表/// </summary>/// <param name="RequedstPath">服务器下的相对路径</param>/// <returns></returns>public static List<string> GetFile(string RequedstPath){List<string> strs = new List<string>();try{string uri = path + RequedstPath;   //目标路径 path为服务器地址FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));// ftp用户名和密码reqFTP.Credentials = new NetworkCredential(username, password);reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;WebResponse response = reqFTP.GetResponse();StreamReader reader = new StreamReader(response.GetResponseStream());//中文文件名string line = reader.ReadLine();while (line != null){if (!line.Contains("<DIR>")){string msg = line.Substring(39).Trim();strs.Add(msg);}line = reader.ReadLine();}reader.Close();response.Close();return strs;}catch (Exception ex){Console.WriteLine("获取文件出错：" + ex.Message);}return strs;}//从ftp服务器上下载文件的功能  public void Download( string fileName){FtpWebRequest reqFTP;try{string filePath = Application.StartupPath;FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(path + fileName));reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;reqFTP.UseBinary = true;reqFTP.Credentials = new NetworkCredential(username, password);reqFTP.UsePassive = false;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);while (readCount > 0){outputStream.Write(buffer, 0, readCount);readCount = ftpStream.Read(buffer, 0, bufferSize);}ftpStream.Close();outputStream.Close();response.Close();}catch (Exception ex){throw ex;}}  }
}namespace WindowsFormsApplication1
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){FtpHelper m_ftp=new FtpHelper();string[] list = FtpHelper.GetFileList("/");m_ftp.Download("monitor_config.xml");}}
}

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