C#中应用PSFTP实现SFTP上传

上传

SFTP，第一次听说，还以为是公司自己搞得一个东东呢，google了一下，原来是一种FTP协议，是可信任的FTP，类似于HTTPS协议。

这次项目就是要将一些数据文件打包通过SFTP传到德国的Server，所以中途是需要加密传输的，即通过SFTP进行数据的上传动作。

找了一个开源的东东，PSFTP，是一个绿色EXE档，C#中控制也很方便，于是自己封装了一下方便自己的应用。

PSFTP的命令是典型的Unix命令，很简单易懂，下面是其基本的命令：

C#中使用Process调用该EXE实现FTP的上传，参数如下：

C#中调用方式如下：

Upload#region Upload
/**//// <summary>
/// Upload the files
/// </summary>
/// <returns>output of the plugin during its running in console</returns>
public string Upload()
...{
    string outPutMessage = "";
    string scriptLocation = "";

    //Create Script File
    scriptLocation = this.CreateScriptFile();

    Begin for ProcessStartInfo#region Begin for ProcessStartInfo
    //Run the Upload event
    ProcessStartInfo processInfo = new ProcessStartInfo();
    //Set the Shell Command(the plugins' path)
    processInfo.FileName = this.m_ShellCommand;
    //Don't show console window
    processInfo.CreateNoWindow = true;
    //don't use shell to execute this script
    processInfo.UseShellExecute = false;
    //Open Process Error Output
    processInfo.RedirectStandardError = true;
    //Open Process Input
    processInfo.RedirectStandardInput = true;
    //Open Process Output
    processInfo.RedirectStandardOutput = true;
    //Get process arguments
    string arguments = "";
    arguments += this.m_UserID + "@" + this.m_ServerName + " "; //Login Server with specified userid
    arguments += "-pw " + this.m_Password + " "; //Login with specified password
    arguments += "-P " + this.m_Port + " "; //Connect to specified port
    arguments += "-b " + scriptLocation + " "; //use specified batchfile
    arguments += "-be"; //don't stop batchfile processing if errors
    processInfo.Arguments = arguments;
    #endregion
    //Create new Process
    Process process = new Process();
    try
    ...{
        //Start execute the ProcessStartInfo
        process.StartInfo = processInfo;
        //Run the process
        process.Start();
        //Input "y" for the psftp's first login prompt
        //Just for the security information
        process.StandardInput.WriteLine("y");

        //Get the return message from process(Error and Output information)
        //This message will be logged to file for debug!
        outPutMessage += process.StandardOutput.ReadToEnd();
        outPutMessage += process.StandardError.ReadToEnd();
        //Wait for the process exit
        process.WaitForExit();
        //Close all the modules opened
        process.Close();
        process.Dispose();
        //Delete the script file
        File.Delete(scriptLocation);
        return outPutMessage;
    }
    catch(Exception ex)
    ...{
        process.Dispose();
        //Delete the script file
        File.Delete(scriptLocation);
        throw new Exception("Error occured during upload file to remote server!",ex);
    }
}
#endregion

CreateScriptFile#region CreateScriptFile
/**//// <summary>
/// Create Batch Script File
/// </summary>
/// <returns>file full path</returns>
private string CreateScriptFile()
...{
    StreamWriter fileStream;
    string scriptLocation = "";
    //Get the Batch Script to execute
    StringBuilder sbdScript = new StringBuilder();
    //Redirect to the default remote location
    sbdScript.Append("cd " + this.m_RemoteLocation + Environment.NewLine);
    //Upload files
    foreach(object file in this.m_UploadFiles)
    ...{
        sbdScript.Append("put " + (string)file + Environment.NewLine);
    }

    //Close the session
    sbdScript.Append("quit");
    //Save the Script to templocation
    scriptLocation = this.m_TempLocation + @"" + System.Guid.NewGuid().ToString() + ".scr";

    try
    ...{
        fileStream = new StreamWriter(scriptLocation);
        fileStream.Write(sbdScript.ToString());
        fileStream.Close();
    }
    catch(Exception ex)
    ...{
        fileStream = null;
        throw new Exception("Error occured during create script file!",ex);
    }
    return scriptLocation;
}
#endregion