Question

我试图在ASP.NET中使用FTP模式上传PDF文件，文件上传成功但结果文件已损坏，请给我解决方案。

public void UploadFTPTextFile(string ftpServer, string ftpFolder, string user, string passward, string NName, FileUpload FileUpload1)
{
    byte[] fileBytes = null;
    string fileName = NName;
    using (StreamReader fileStream = new StreamReader(FileUpload1.PostedFile.InputStream))
    {
        fileBytes = Encoding.UTF8.GetBytes(fileStream.ReadToEnd());
        fileStream.Close();
    }
    //Create FTP Request.
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftpServer + ftpFolder + fileName);
    request.Method = WebRequestMethods.Ftp.UploadFile;

    request.Credentials = new NetworkCredential(user, passward);
    request.ContentLength = fileBytes.Length;
    request.UsePassive = true;
    request.UseBinary = true;
    request.ServicePoint.ConnectionLimit = fileBytes.Length;
    request.EnableSsl = false;

    using (Stream requestStream = request.GetRequestStream())
    {
        requestStream.Write(fileBytes, 0, fileBytes.Length);
        requestStream.Close();
    }
}

Answer 1

我认为问题是将输入文件读取为字节。您认为它是UTF8编码，但FTP不解释文本，不需要编码。你应该只读取字节，因为FTP服务器只保存字节。请改用File.ReadAllBytes。

public void UploadFTPTextFile(string ftpServer, string ftpFolder, string user, string passward, string NName, FileUpload FileUpload1)
{
    string fileName = NName;
    byte[] fileBytes = File.ReadAllBytes(fileName);

    //Create FTP Request.
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftpServer + ftpFolder + fileName);
    request.Method = WebRequestMethods.Ftp.UploadFile;

    request.Credentials = new NetworkCredential(user, passward);
    request.ContentLength = fileBytes.Length;
    request.UsePassive = true;
    request.UseBinary = true;
    request.ServicePoint.ConnectionLimit = fileBytes.Length;
    request.EnableSsl = false;

    using (Stream requestStream = request.GetRequestStream())
    {
        requestStream.Write(fileBytes, 0, fileBytes.Length);
        requestStream.Close();
    }
}

如果您想使用更优雅的解决方案（对于大文件），请使用Stream.CopyTo并将打开的文件复制到requestStream而不使用fileBytes。

FTP上传的文件已损坏

1 个答案: