一.奇葩的故事：
今天项目中遇到这么个奇葩的问题，ftp文件传输完成后要在ftp目录下另一个文件夹下创建对应的空文件，听说是为了文件的完整性，既然这么说，那么就必须这么干，员工服从领导是员工的天职，一来二去，思路有了。两个方案：1.通过ftp创建文件；2.本地创建然后在传输过去。开始觉得ftp创建文件不太好整，毕竟要在远程电脑上创建文件，应该是不被允许的把。所以只能使用另一种方案了，在本地创建文件然后在通过ftp传过去不就行了么，说干就干。主要是项目更改不大，就这么干了。（白干了）然而，遇到奇葩的问题了，传过去后还要修改文件名，还没来的及修改被迁移程序迁走了，还没来的及修改就被迁移了，所以文件名不符合要求了，这都是小事，主要是后面的程序不能执行，传输程序报错，同步程序报错，真所谓的牵一发而动全身。所以，上面说的白干了就是这么个意思。既然遇到问题，就得解决呗，说着只能回到之前的思路上了。那么就只能通过第一种方案了，通过ftp创建文件。网上找了个ftpHelper但是看了确实没有创建文件的函数，但细细看来，和上传文件挺类似的，那么就有了下面的故事。
二.FTPHelper类库：
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions; namespace FTP_Demo
{
/// <summary>
/// FTP帮助类
/// </summary>
public class FTPHelper
{
#region 字段
string ftpURI;
string ftpUserID;
string ftpServerIP;
string ftpPassword;
string ftpRemotePath;
#endregion /// <summary>
/// 连接FTP服务器
/// </summary>
/// <param name="FtpServerIP">FTP连接地址</param>
/// <param name="FtpRemotePath">指定FTP连接成功后的当前目录, 如果不指定即默认为根目录</param>
/// <param name="FtpUserID">用户名</param>
/// <param name="FtpPassword">密码</param>
public FTPHelper(string FtpServerIP, string FtpRemotePath, string FtpUserID, string FtpPassword)
{
ftpServerIP = FtpServerIP;
ftpRemotePath = FtpRemotePath;
ftpUserID = FtpUserID;
ftpPassword = FtpPassword;
ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
} /// <summary>
/// 上传
/// </summary>
public void Upload(string filename)
{
FileInfo fileInf = new FileInfo(filename);
FtpWebRequest reqFTP;
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileInf.Name));
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
reqFTP.KeepAlive = false;
reqFTP.UseBinary = true;
reqFTP.ContentLength = fileInf.Length;
int buffLength = ;
byte[] buff = new byte[buffLength];
int contentLen;
FileStream fs = fileInf.OpenRead();
try
{
Stream strm = reqFTP.GetRequestStream();
contentLen = fs.Read(buff, , buffLength);
while (contentLen != )
{
strm.Write(buff, , contentLen);
contentLen = fs.Read(buff, , buffLength);
}
strm.Close();
fs.Close();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
} /// <summary>
/// 下载
/// </summary>
public void Download(string filePath, string fileName)
{
try
{
FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);
FtpWebRequest reqFTP;
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName));
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
reqFTP.UseBinary = true;
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
Stream ftpStream = response.GetResponseStream();
long cl = response.ContentLength;
int bufferSize = ;
int readCount;
byte[] buffer = new byte[bufferSize];
readCount = ftpStream.Read(buffer, , bufferSize);
while (readCount > )
{
outputStream.Write(buffer, , readCount);
readCount = ftpStream.Read(buffer, , bufferSize);
}
ftpStream.Close();
outputStream.Close();
response.Close();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
} /// <summary>
/// 删除文件
/// </summary>
public void Delete(string fileName)
{
try
{
FtpWebRequest reqFTP;
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName));
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;
reqFTP.KeepAlive = false;
string result = String.Empty;
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
long size = response.ContentLength;
Stream datastream = response.GetResponseStream();
StreamReader sr = new StreamReader(datastream);
result = sr.ReadToEnd();
sr.Close();
datastream.Close();
response.Close();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
} /// <summary>
/// 获取当前目录下明细(包含文件和文件夹)
/// </summary>
public string[] GetFilesDetailList()
{
try
{
StringBuilder result = new StringBuilder();
FtpWebRequest ftp;
ftp = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));
ftp.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
WebResponse response = ftp.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
string line = reader.ReadLine();
line = reader.ReadLine();
line = reader.ReadLine();
while (line != null)
{
result.Append(line);
result.Append("\n");
line = reader.ReadLine();
}
result.Remove(result.ToString().LastIndexOf("\n"), );
reader.Close();
response.Close();
return result.ToString().Split('\n');
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
} /// <summary>
/// 获取FTP文件列表(包括文件夹)
/// </summary>
private string[] GetAllList(string url)
{
List<string> list = new List<string>();
FtpWebRequest req = (FtpWebRequest)WebRequest.Create(new Uri(url));
req.Credentials = new NetworkCredential(ftpPassword, ftpPassword);
req.Method = WebRequestMethods.Ftp.ListDirectory;
req.UseBinary = true;
req.UsePassive = true;
try
{
using (FtpWebResponse res = (FtpWebResponse)req.GetResponse())
{
using (StreamReader sr = new StreamReader(res.GetResponseStream()))
{
string s;
while ((s = sr.ReadLine()) != null)
{
list.Add(s);
}
}
}
}
catch (Exception ex)
{
throw (ex);
}
return list.ToArray();
} /// <summary>
/// 获取当前目录下文件列表(不包括文件夹)
/// </summary>
public string[] GetFileList(string url)
{
StringBuilder result = new StringBuilder();
FtpWebRequest reqFTP;
try
{
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential(ftpPassword, ftpPassword);
reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
WebResponse response = reqFTP.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
string line = reader.ReadLine();
while (line != null)
{ if (line.IndexOf("<DIR>") == -)
{
result.Append(Regex.Match(line, @"[\S]+ [\S]+", RegexOptions.IgnoreCase).Value.Split(' ')[]);
result.Append("\n");
}
line = reader.ReadLine();
}
result.Remove(result.ToString().LastIndexOf('\n'), );
reader.Close();
response.Close();
}
catch (Exception ex)
{
throw (ex);
}
return result.ToString().Split('\n');
} /// <summary>
/// 判断当前目录下指定的文件是否存在
/// </summary>
/// <param name="RemoteFileName">远程文件名</param>
public bool FileExist(string RemoteFileName)
{
string[] fileList = GetFileList("*.*");
foreach (string str in fileList)
{
if (str.Trim() == RemoteFileName.Trim())
{
return true;
}
}
return false;
} /// <summary>
/// 创建文件夹
/// </summary>
public void MakeDir(string dirName)
{
FtpWebRequest reqFTP;
try
{
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + dirName));
reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
Stream ftpStream = response.GetResponseStream();
ftpStream.Close();
response.Close();
}
catch (Exception ex)
{ }
} /// <summary>
/// 获取指定文件大小
/// </summary>
public long GetFileSize(string filename)
{
FtpWebRequest reqFTP;
long fileSize = ;
try
{
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + filename));
reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
Stream ftpStream = response.GetResponseStream();
fileSize = response.ContentLength;
ftpStream.Close();
response.Close();
}
catch (Exception ex)
{ }
return fileSize;
} /// <summary>
/// 更改文件名
/// </summary>
public void ReName(string currentFilename, string newFilename)
{
FtpWebRequest reqFTP;
try
{
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + currentFilename));
reqFTP.Method = WebRequestMethods.Ftp.Rename;
reqFTP.RenameTo = newFilename;
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
Stream ftpStream = response.GetResponseStream();
ftpStream.Close();
response.Close();
}
catch (Exception ex)
{ }
} /// <summary>
/// 移动文件
/// </summary>
public void MovieFile(string currentFilename, string newDirectory)
{
ReName(currentFilename, newDirectory);
} /// <summary>
/// 切换当前目录
/// </summary>
/// <param name="IsRoot">true:绝对路径 false:相对路径</param>
public void GotoDirectory(string DirectoryName, bool IsRoot)
{
if (IsRoot)
{
ftpRemotePath = DirectoryName;
}
else
{
ftpRemotePath += DirectoryName + "/";
}
ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
} /// <summary>
/// 创建文件
/// </summary>
/// <param name="filename">文件名</param>
/// <param name="text">内容</param>
public void CreateFile(string filename, string text)
{
int bufferLength = ;
byte[] buffer = new byte[bufferLength];
FtpWebRequest reqFTP;
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + filename));
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
reqFTP.KeepAlive = false;
reqFTP.UseBinary = true;
reqFTP.ContentLength = text.Length;
buffer = Encoding.Unicode.GetBytes(text);
using (Stream stream = reqFTP.GetRequestStream())
{
int count = buffer.Length;
while (count > )
{
if (buffer.Length < bufferLength)
{
bufferLength = buffer.Length;
}
stream.Write(buffer, , bufferLength);
count = count - bufferLength;
}
}
}
}
}
三.定义ftp创建文件函数：
/// <summary>
/// 创建文件
/// </summary>
/// <param name="filename">文件名</param>
/// <param name="text">内容</param>
public void CreateFile(string filename, string text)
{
int bufferLength = ;
byte[] buffer = new byte[bufferLength];
FtpWebRequest reqFTP;
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + filename));
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
reqFTP.KeepAlive = false;
reqFTP.UseBinary = true;
reqFTP.ContentLength = text.Length;
buffer = Encoding.Unicode.GetBytes(text);
using (Stream stream = reqFTP.GetRequestStream())
{
int count = buffer.Length;
while (count > )
{
if (buffer.Length < bufferLength)
{
bufferLength = buffer.Length;
}
stream.Write(buffer, , bufferLength);
count = count - bufferLength;
}
}
}
四.注意：
stream.Write(buffer, 0, bufferLength);
由于内容的长度有可能小于 bufferLength，所以做了如上if处理。（在这里被坑过了，提示一下而已！）
