FTP上传下载类

时间:2021-10-10 04:38:14
public class FtpOperation
{
public static void UploadFile(FileInfo fileinfo, string targetDir, string hostname, string username, string password, string reName)
{
//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 = ;
byte[] content = new byte[BufferSize - + ];
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, , BufferSize);
rs.Write(content, , 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 = reName;
//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
} public static void Download(string filePath, string fileName, string ftpServerIP, string ftpUser, string ftpPwd)
{
FtpWebRequest reqFTP;
try
{
//filePath = <<The full path where the file is to be created.>>,
//fileName = <<Name of the file to be created(Need not be the name of the file on FTP server).>>
FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create); reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileName));
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential(ftpUser, ftpPwd);
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
Stream ftpStream = response.GetResponseStream();
long cl = response.ContentLength;
int bufferSize = ;
int readCount;
byte[] buffer = new byte[bufferSize]; readCount = ftpStream.Read(buffer, , bufferSize);
while (readCount > )
{
outputStream.Write(buffer, , readCount);
readCount = ftpStream.Read(buffer, , bufferSize);
} ftpStream.Close();
outputStream.Close();
response.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
} public static string GetStringResponse(FtpWebRequest ftp)
{
//Get the result, streaming to a string
string result = "";
using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
{
long size = response.ContentLength;
using (Stream datastream = response.GetResponseStream())
{
using (StreamReader sr = new StreamReader(datastream, System.Text.Encoding.Default))
{
result = sr.ReadToEnd();
sr.Close();
} datastream.Close();
} response.Close();
} return result;
} public 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 = true;
return result;
}
}