c#实现FTP上传

c#实现FTP上传

/// <summary>
/// 上传文件
/// </summary>
/// <param name="fileinfo">需要上传的文件</param>
/// <param name="targetDir">目标路径</param>
/// <param name="hostname">ftp地址</param>
/// <param name="username">ftp用户名</param>
/// <param name="password">ftp密码</param>
public static void UploadFile(FileInfo fileinfo, string targetDir, string hostname, string username, string password)
{
//1. check target
string target;
if (targetDir.Trim() == "")
{
return;
}
target = Guid.NewGuid().ToString(); //使用临时文件名

string URI = "FTP://" + hostname + "/" + targetDir + "/" + target;
///WebClient webcl = new WebClient();
System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);

//设置FTP命令 设置所要执行的FTP命令，
//ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectoryDetails;//假设此处为显示指定路径下的文件列表
ftp.Method = System.Net.WebRequestMethods.Ftp.UploadFile;
//指定文件传输的数据类型
ftp.UseBinary = true;
ftp.UsePassive = true;

//告诉ftp文件大小
ftp.ContentLength = fileinfo.Length;
//缓冲大小设置为2KB
const int BufferSize = 2048;
byte[] content = new byte[BufferSize - 1 + 1];
int dataRead;

//打开一个文件流 (System.IO.FileStream) 去读上传的文件
using (FileStream fs = fileinfo.OpenRead())
{
try
{
//把上传的文件写入流
using (Stream rs = ftp.GetRequestStream())
{
do
{
//每次读文件流的2KB
dataRead = fs.Read(content, 0, BufferSize);
rs.Write(content, 0, dataRead);
} while (!(dataRead < BufferSize));
rs.Close();
}

}
catch (Exception ex) { }
finally
{
fs.Close();
}

}

ftp = null;
//设置FTP命令
ftp = GetRequest(URI, username, password);
ftp.Method = System.Net.WebRequestMethods.Ftp.Rename; //改名
ftp.RenameTo = fileinfo.Name;
try
{
ftp.GetResponse();
}
catch (Exception ex)
{
ftp = GetRequest(URI, username, password);
ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile; //删除
ftp.GetResponse();
throw ex;
}
finally
{
//fileinfo.Delete();
}

// 可以记录一个日志 "上传" + fileinfo.FullName + "上传到" + "FTP://" + hostname + "/" + targetDir + "/" + fileinfo.Name + "成功." );
ftp = null;

#region
/*****
*FtpWebResponse
* ****/
//FtpWebResponse ftpWebResponse = (FtpWebResponse)ftp.GetResponse();
#endregion
}

private static FtpWebRequest GetRequest(string URI, string username, string password)
{
//根据服务器信息FtpWebRequest创建类的对象
FtpWebRequest result = (FtpWebRequest)FtpWebRequest.Create(URI);
//提供身份验证信息
result.Credentials = new System.Net.NetworkCredential(username, password);
//设置请求完成之后是否保持到FTP服务器的控制连接，默认值为true
result.KeepAlive = false;
return result;
}