C# FTP 文件 文件夹操作 上传 下载

C# FTP 文件 文件夹操作 上传 下载



最近研究了用代码操作FTP的文件和文件夹操作

得到FTP的连接：

FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(path);
//指定数据传输类型 false 文件类型， true 二进制；类型
reqFTP.UseBinary = true;
//ftp用户名和密码
reqFTP.Credentials = new NetworkCredential(ftpUserId, ftpPassword);

文件上传

/// <summary>
/// 上传文件
/// </summary>
/// <param name="filename"></param>
public void Upload(string filename,string directoryName)
{
FileInfo fileInf = new FileInfo(filename);
string uri = "ftp://" + ftpServerIP + "//" + directoryName+"//"+fileInf.Name;

//得到连接
Connect(uri);
//默认为true，连接不会被关闭
//在一个命令之后被执行
reqFTP.KeepAlive = false;
//指定执行命令
reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
//指定文件的大小
reqFTP.ContentLength = fileInf.Length;
//缓存大小设置为kb
int bufflength = 2048;
byte[] buff = new byte[bufflength];
int contenLen;
//打开一个文件流(System.IO.FileString)去读上传文件
FileStream fs = fileInf.OpenRead();
try
{
//把上传的文件写入流
Stream stream = reqFTP.GetRequestStream();
//每次读文件流的kb
contenLen = fs.Read(buff,0,bufflength);
//流内容没有结束
while (contenLen != 0)
{
stream.Write(buff,0,contenLen);
contenLen = fs.Read(buff,0,bufflength);
}
//关闭两个流
stream.Close();
fs.Close();
}
catch (Exception e)
{

MessageBox.Show("upload error", e.Message);
}
}



/// <summary>
/// 下载文件
/// </summary>
/// <param name="filePath"></param>
/// <param name="fileName"></param>
/// <param name="errorinfo"></param>
/// <returns></returns>
public bool Downlad(string filePath, string fileName)
{
try
{
string onlyFileName = Path.GetFileName(fileName);
string newFileName = filePath + "//" + onlyFileName;
if (File.Exists(newFileName))
{
//errorinfo = string.Format("本地文件{0}已存在,无法下载", newFileName);
return false;
}

string url = "ftp://" + ftpServerIP + "/" + fileName;
//取得连接
Connect(url);
reqFTP.Credentials = new NetworkCredential(ftpUserId,ftpPassword);
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);
FileStream outputStream = new FileStream(newFileName,FileMode.Create);
while (readCount > 0)
{
outputStream.Write(buffer, 0, readCount);
readCount = ftpStream.Read(buffer, 0,bufferSize);
}
ftpStream.Close();
outputStream.Close();
response.Close();
//errorinfo = "";
return true;
}
catch (Exception ex)
{
//errorinfo = string.Format("因{0},无法下载", ex.Message);

MessageBox.Show("download错误",ex.Message);

return false;
}
}