C# ftp服务 针对文件上传下载，初始化一个FtpHelper 类，如果用不了这么多，只取其中方法进行调用，备忘使用。
class FtpHelper
{
// 默认常量定义
private static readonly string rootPath = "/";
private static readonly int defaultReadWriteTimeout = 300000;
private static readonly int defaultFtpPort = 21;
#region 设置初始化参数
private string host = string.Empty;
public string Host
{
get
{
return this.host ?? string.Empty;
}
}
private string username = string.Empty;
public string Username
{
get
{
return this.username;
}
}
private string password = string.Empty;
public string Password
{
get
{
return this.password;
}
}
IWebProxy proxy = null;
public IWebProxy Proxy
{
get
{
return this.proxy;
}
set
{
this.proxy = value;
}
}
private int port = defaultFtpPort;
public int Port
{
get
{
return port;
}
set
{
this.port = value;
}
}
private bool enableSsl = false;
public bool EnableSsl
{
get
{
return enableSsl;
}
}
private bool usePassive = true;
public bool UsePassive
{
get
{
return usePassive;
}
set
{
this.usePassive = value;
}
}
private bool useBinary = true;
public bool UserBinary
{
get
{
return useBinary;
}
set
{
this.useBinary = value;
}
}
private string remotePath = rootPath;
public string RemotePath
{
get
{
return remotePath;
}
set
{
string result = rootPath;
if (!string.IsNullOrEmpty(value) && value != rootPath)
{
result = Path.Combine(Path.Combine(rootPath, value.TrimStart('/').TrimEnd('/')), "/"); // 进行路径的拼接
}
this.remotePath = result;
}
}
private int readWriteTimeout = defaultReadWriteTimeout;
public int ReadWriteTimeout
{
get
{
return readWriteTimeout;
}
set
{
this.readWriteTimeout = value;
}
}
#endregion
#region 构造函数
public FtpHelper(string host, string username, string password)
: this(host, username, password, defaultFtpPort, null, false, true, true, defaultReadWriteTimeout)
{
}
///
/// 构造函数
///
/// 主机名
/// 用户名
/// 密码
/// 端口号 默认21
/// 代理 默认没有
/// 是否使用ssl 默认不用
/// 使用二进制
/// 获取或设置客户端应用程序的数据传输过程的行为
/// 读写超时时间 默认5min
public FtpHelper(string host, string username, string password, int port, IWebProxy proxy, bool enableSsl, bool useBinary, bool usePassive, int readWriteTimeout)
{
this.host = host.ToLower().StartsWith("ftp://") ? host : "ftp://" + host;
this.username = username;
this.password = password;
this.port = port;
this.proxy = proxy;
this.enableSsl = enableSsl;
this.useBinary = useBinary;
this.usePassive = usePassive;
this.readWriteTimeout = readWriteTimeout;
}
#endregion
///
/// 拼接URL
///
/// 主机名
/// 地址
/// 文件名
/// 返回完整的URL
private string UrlCombine(string host, string remotePath, string fileName)
{
string result = new Uri(new Uri(new Uri(host.TrimEnd('/')), remotePath), fileName).ToString(); ;
return result;
}
///
/// 创建连接
///
/// 地址
/// 方法
/// 返回 request对象
private FtpWebRequest CreateConnection(string url, string method)
{
FtpWebRequest request = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));
request.Credentials = new NetworkCredential(this.username, this.password);
request.Proxy = this.proxy;
request.KeepAlive = false;
request.UseBinary = useBinary;
request.UsePassive = usePassive;
request.EnableSsl = enableSsl;
request.Method = method;
Console.WriteLine(request);
return request;
}
///
/// 上传文件
///
/// 本地文件
/// 上传文件名
/// 上传成功返回 true
public bool Upload(FileInfo localFile, string remoteFileName)
{
try
{
LogHelper.Log("start ftp upload");
if (!localFile.Exists)
{
LogHelper.Log("ftp upload, 本地文件不存在:" + localFile.FullName);
return false;
}
FtpCheckDirectoryExist(remoteFileName);
string url = UrlCombine(Host, RemotePath, remoteFileName);
LogHelper.Log("ftp upload url:" + url);
FtpWebRequest request = CreateConnection(url, WebRequestMethods.Ftp.UploadFile);
LogHelper.Log("ftp connect ok");
using (Stream rs = request.GetRequestStream())
using (FileStream fs = localFile.OpenRead())
{
byte[] buffer = new byte[1024 * 4];
int count = fs.Read(buffer, 0, buffer.Length);
while (count > 0)
{
rs.Write(buffer, 0, count);
count = fs.Read(buffer, 0, buffer.Length);
}
fs.Close();
return true;
}
}
catch (WebException ex)
{
LogHelper.Log("上传ftp异常：" + ex.Message);
return false;
}
}
///
/// 下载文件
///
/// 服务器文件名称
/// 需要保存在本地的文件名称
/// 下载成功返回 true
public bool Download(string serverName, string localName)
{
bool result = false;
using (FileStream fs = new FileStream(localName, FileMode.OpenOrCreate))
{
try
{
string url = UrlCombine(Host, RemotePath, serverName);
LogHelper.Log("ftp download url:" + url);
FtpWebRequest request = CreateConnection(url, WebRequestMethods.Ftp.DownloadFile);
request.ContentOffset = fs.Length;
using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
{
fs.Position = fs.Length;
byte[] buffer = new byte[1024 * 4];
int count = response.GetResponseStream().Read(buffer, 0, buffer.Length);
while (count > 0)
{
fs.Write(buffer, 0, count);
count = response.GetResponseStream().Read(buffer, 0, buffer.Length);
}
response.GetResponseStream().Close();
}
result = true;
}
catch (WebException ex)
{
// 处理ftp连接中的异常
LogHelper.Log("ftp下载异常：" + ex.Message);
}
}
return result;
}
//判断文件的目录是否存,不存则创建
// destFilePath 是文件全路径（不带ftp ip），例如 \a\b\c\aa.text
// 函数会创建除文件名以外的路径，如 \a\b\c\
public void FtpCheckDirectoryExist(string destFilePath)
{
LogHelper.Log("开始创建ftp路径：" + destFilePath);
destFilePath = destFilePath.Replace('/', '\\');
LogHelper.Log("替换创建ftp路径：" + destFilePath);
string fullDir = FtpParseDirectory(destFilePath);
string[] dirs = fullDir.Split('\\');
string curDir = "\\";
for (int i = 0; i < dirs.Length; i++)
{
string dir = dirs[i];
//如果是以/开始的路径,第一个为空
if (dir != null && dir.Length > 0)
{
try
{
curDir += dir + "\\";
// cruDir 如 \root\a\b\
LogHelper.Log("创建子路径：" + curDir);
FtpMakeDir(curDir);
}
catch (Exception )
{
// 抛出异常说明目录已存在，继续尝试创建下一级
//LogHelper.Log("make dir err:" + e.Message);
}
}
}
}
private string FtpParseDirectory(string destFilePath)
{
return destFilePath.Substring(0, destFilePath.LastIndexOf("\\"));
}
//创建目录
//如果失败会抛出异常
// path是子路径，如\a\b\c\
public bool FtpMakeDir(string path)
{
try
{
string url = UrlCombine(Host, RemotePath, path);
FtpWebRequest req = CreateConnection(url, WebRequestMethods.Ftp.MakeDirectory);
FtpWebResponse response = (FtpWebResponse)req.GetResponse();
response.Close();
}
catch (Exception )
{
//LogHelper.Log("创建目录异常：" + e.Message);
throw;
}
return true;
}
}