FTP文件管理

因为网站有下载文件需要和网站分离，使用到了FTP管理文件，这里做一个简单的整理。

1.安装FTP

和安装iis一样。全部勾选。

public static class FtpHelper
{
//基本设置
private const string Path = @"ftp://192.168.253.4:21/"; //目标路径
private const string Ftpip = "192.168.253.4"; // GetAppConfig("obj");    //ftp IP地址
private const string Username = "stone"; //GetAppConfig("username");   //ftp用户名
private const string Password = "111111"; //GetAppConfig("password");   //ftp密码
// 2M 可能不够
private const int bufferSize = 2048;

/// <summary>
/// 获取自定义配置的值
/// </summary>
/// <param name="strKey">键值</param>
/// <returns>键值对应的值</returns>
public static string GetAppConfig(string strKey)
{
foreach (string key in ConfigurationManager.AppSettings)
{
if (key == strKey)
{
return ConfigurationManager.AppSettings[strKey];
}
}
return null;
}

//获取ftp上面的文件和文件夹
public static string[] GetFileList(string dir)
{
var result = new StringBuilder();
try
{
var ftpRequest = FtpRequest(Path, WebRequestMethods.Ftp.ListDirectory);

WebResponse response = ftpRequest.GetResponse();
var 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);
return new[] {""};
}
}

/// <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)
{
var result = new StringBuilder();
FtpWebRequest request;
try
{
request = (FtpWebRequest) WebRequest.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;

var 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="localFile">原路径（绝对路径）包括文件名</param>
/// <param name="remoteFile">目标文件夹：服务器下的相对路径 不填为根目录</param>
public static bool UpLoad(string localFile, string remoteFile = "")
{
try
{
string url = Path;
if (remoteFile != "")
url += remoteFile + "/";
try
{
//待上传的文件 （全路径）
try
{
var fileInfo = new FileInfo(localFile);
using (FileStream fs = fileInfo.OpenRead())
{
long length = fs.Length;
FtpWebRequest reqFtp = FtpRequest(url + fileInfo.Name,WebRequestMethods.Ftp.UploadFile);
using (Stream stream = reqFtp.GetRequestStream())
{
//设置缓冲大小
int BufferLength = 5120;
var 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");
return true;
}
}
}
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);
}
return false;
}

public static bool UpLoad(Stream localFileStream, string remoteFile)
{
bool result = true;
try
{
var ftpRequest = FtpRequest(Path + remoteFile, WebRequestMethods.Ftp.UploadFile);
var ftpStream = ftpRequest.GetRequestStream();
var byteBuffer = new byte[bufferSize];
int bytesSent = localFileStream.Read(byteBuffer, 0, bufferSize);

try
{
while (bytesSent != 0)
{
ftpStream.Write(byteBuffer, 0, bytesSent);
bytesSent = localFileStream.Read(byteBuffer, 0, bufferSize);
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
result = false;
}

localFileStream.Close();
ftpStream.Close();
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
result = false;
}
return result;
}

public static FtpWebRequest FtpRequest(string requstUrl,string method,bool closedResponse=false)
{
var reqFtp = (FtpWebRequest) WebRequest.Create(new Uri(requstUrl));
//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 = method;
//指定数据传输类型
reqFtp.UseBinary = true;

if (closedResponse)
{
var resp=reqFtp.GetResponse();
resp.Close();
}

return reqFtp;
}

/// <summary>
/// 下载
/// </summary>
/// <param name="localFile">目的位置</param>
/// <param name="remoteFile">服务器相对位置</param>
/// <returns></returns>
public static bool Download(string localFile,string remoteFile)
{
bool check = true;
try
{
var outputStream = new FileStream(localFile, FileMode.Create);
var ftpRequest = FtpRequest(Path + remoteFile, WebRequestMethods.Ftp.DownloadFile);

var response = (FtpWebResponse)ftpRequest.GetResponse();
Stream ftpStream = response.GetResponseStream();
long cl = response.ContentLength;
int bufferSize = 2048;
int readCount;
var 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 err)
{
check = false;
}
return check;
}

public static Stream Download(string remoteFile)
{
var ftpRequest = FtpRequest(Path + remoteFile, WebRequestMethods.Ftp.DownloadFile);
var response = (FtpWebResponse)ftpRequest.GetResponse();
Stream ftpStream = response.GetResponseStream();
return ftpStream;
}

/// <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
{
FtpRequest(Path + fileName, WebRequestMethods.Ftp.DeleteFile,true);
}
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
{
FtpRequest(Path + dirName, WebRequestMethods.Ftp.MakeDirectory, true);
}
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
{
FtpRequest(Path + dirName, WebRequestMethods.Ftp.RemoveDirectory,true);
}
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)
{
var strs = new List<string>();
try
{
var reqFtp = FtpRequest(Path + requedstPath, WebRequestMethods.Ftp.ListDirectoryDetails);
WebResponse response = reqFtp.GetResponse();
var 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)
{
var strs = new List<string>();
try
{
var reqFtp = FtpRequest(Path + requedstPath, WebRequestMethods.Ftp.ListDirectoryDetails);
WebResponse response = reqFtp.GetResponse();
var 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;
}
}

View Code
主要是通过创建FtpRequest来处理Ftp相关请求。

public static FtpWebRequest FtpRequest(string requstUrl,string method,bool closedResponse=false)
{
var reqFtp = (FtpWebRequest) WebRequest.Create(new Uri(requstUrl));
//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 = method;
//指定数据传输类型
reqFtp.UseBinary = true;
if (closedResponse)
{
var resp=reqFtp.GetResponse();
resp.Close();
}
return reqFtp;
}

因为在MVC网站中使用的文件流的方式。

下载：

public static Stream Download(string remoteFile)
{
var ftpRequest = FtpRequest(Path + remoteFile, WebRequestMethods.Ftp.DownloadFile);
var response = (FtpWebResponse)ftpRequest.GetResponse();
Stream ftpStream = response.GetResponseStream();
return ftpStream;
}

调用：

public ActionResult DownloadFileFromFtp()
{
var filepath = "DIAView//simple.png";
var stream = FtpHelper.Download(filepath);
return File(stream, FileHelper.GetContentType(".png"),"test.png");
}

上传：

public static bool UpLoad(Stream localFileStream, string remoteFile)
{
bool result = true;
try
{
var ftpRequest = FtpRequest(Path + remoteFile, WebRequestMethods.Ftp.UploadFile);
var ftpStream = ftpRequest.GetRequestStream();
var byteBuffer = new byte[bufferSize];
int bytesSent = localFileStream.Read(byteBuffer, 0, bufferSize);

try
{
while (bytesSent != 0)
{
ftpStream.Write(byteBuffer, 0, bytesSent);
bytesSent = localFileStream.Read(byteBuffer, 0, bufferSize);
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
result = false;
}

localFileStream.Close();
ftpStream.Close();
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
result = false;
}
return result;
}

调用：

[HttpPost]
public JsonResult UploadFile(HttpPostedFileBase fileData)
{
if (fileData != null)
{
string fileName = Path.GetFileName(fileData.FileName);// 原始文件名称
string saveName = Encrypt.GenerateOrderNumber() +"_"+fileName;
FtpHelper.UpLoad(fileData.InputStream, "DIAView" + "/" + saveName);
return Json(new { Success = true, FileName = fileName, SaveName = saveName}, JsonRequestBehavior.AllowGet);
}
return Json(new { Success = false, Message = "请选择要上传的文件！" }, JsonRequestBehavior.AllowGet);
}

Ftp还可以设置不同用户有不同的目录，是以为记。