C# FileStream进行FTP服务上传文件和下载文件
定义FileStream类的操作类:操作类名: FtpUpDown
上传文件
/// <summary>
/// 上传文件
/// </summary>
/// <param name="localpath">上传文件的全路径 例@"D:\123.txt"</param>
/// <param name="ftppath"></param>
/// <returns></returns>
public bool Upload(string localpath, string ftppath)
{
bool bol = false;
try
{
FileInfo fileInf = new FileInfo(localpath);
//替换符号
ftppath = ftppath.Replace("\\", "/");
//组合ftp上传文件路径
string uri = "ftp://" + ftppath + "/" + fileInf.Name;
// 根据uri创建FtpWebRequest对象
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(ftpUserID, ftpPassword);
// 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.UploadFile;
// 上传文件时通知服务器文件的大小
reqFTP.ContentLength = fileInf.Length;
// 缓冲大小设置为kb
int buffLength = 2048;
byte[] buff = new byte[buffLength];
int contentLen;
// 打开一个文件流(System.IO.FileStream) 去读上传的文件
FileStream fs = fileInf.OpenRead();
try
{
// 把上传的文件写入流
Stream strm = reqFTP.GetRequestStream();
// 每次读文件流的kb
contentLen = fs.Read(buff, 0, buffLength);
// 流内容没有结束
while (contentLen != 0)
{
// 把内容从file stream 写入upload stream
strm.Write(buff, 0, contentLen);
contentLen = fs.Read(buff, 0, buffLength);
bol = true;
}
// 关闭两个流
strm.Close();
fs.Close();
}
catch (Exception ex)
{
MessageBox.Show("上传文件失败，失败原因；" + ex.Message);
}
}
catch (Exception ex)
{
MessageBox.Show("上传文件失败，失败原因；" + ex.Message);
}
return bol;
}
下载文件:
/// <summary>
/// 下载文件
/// </summary>
/// <param name="localpath"></param>
/// <param name="fileName"></param>
/// <param name="errorinfo"></param>
/// <returns></returns>
public bool Download(string localpath, string fileName, out string errorinfo)
{
try
{
String onlyFileName = Path.GetFileName(fileName);
string newFileName = localpath + "\\" + 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 + "/FileInfo/" + fileName;
// 根据uri创建FtpWebRequest对象
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));
// 指定数据传输类型
reqFTP.UseBinary = true;
// ftp用户名和密码
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, FileAccess.Write);
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);
return false;
}
}
调用方法：
/// <summary>
/// 上传
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Button_Click_1(object sender, RoutedEventArgs e)
{
FtpUpDown ftp = new FtpUpDown(ftpServerIP, ftpUserID, ftpPassword);
string localpath = @"D:\123.txt";
string ftppath = ftpServerIP + @"\FileInfo";
bool bol = ftp.Upload(localpath, ftppath);
if (bol == true)
MessageBox.Show("上传成功");
else
MessageBox.Show("上传失败");
}
/// <summary>
/// 下载
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Button_Click_2(object sender, RoutedEventArgs e)
{
string errorinfo;
string localpath = @"E:\qzq\FileInfo";
if (!Directory.Exists(localpath))
{
Directory.CreateDirectory(localpath);
}
string filename = "123.txt";
if (!File.Exists(localpath + "\\" + filename))
{
FtpUpDown ftp = new FtpUpDown(ftpServerIP, ftpUserID, ftpPassword);
bool bol = ftp.Download(localpath, filename, out errorinfo);
if (bol == true)
MessageBox.Show("下载成功");
else
MessageBox.Show("下载失败：" + errorinfo + "");
}
else
{
MessageBox.Show("下载文件已存在!");
}
}
其中: ftpServerIP:上传服务的IP地址。
ftpUserID: 上传服务的登录名。
ftpPassword: 上传服务的密码。
