期间的InputStream

Question

我想作指示的教程here

一切都显得精细，从使用SFTP远程服务器下载文件下载从远程服务器通过SFTP使用的OutputStream（机器人）的文件，但是当它到达的OutputStream，它崩溃，并给了我一丝错误：

java.io.FileNotFoundException：/内部存储/文件/ sample.txt的： 打开失败：ENOENT（没有这样的文件或目录）

造成者： libcore.io.ErrnoException：打开失败：ENOENT（没有这样的文件或目录 ）

任何帮助吗？

这里是我的代码：

public class MainActivity extends Activity { 

    private static final String SFTPWORKINGDIR = "/path/to/file"; 
    private String user = "username"; 
    private String pass = "password"; 
    private String host = "hostname"; 
    private int portNum = 22; 

    private String fileName = "sample.txt"; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     new AsyncTask<Void, Void, List<String>>() { 
      @Override 
      protected List<String> doInBackground(Void... params) { 
       try { 
        Downloader(fileName); 
       } catch (Exception e) { 
        e.printStackTrace(); 
       } 
       return null; 
      } 

     }.execute(); 
    } 

    public void Downloader(String fileName) { 

     JSch jsch = new JSch(); 
     Session session = null; 
     Channel channel = null; 
     ChannelSftp sftpChannel = null; 

     try { 

      session = jsch.getSession(user, host, portNum); 
      session.setConfig("StrictHostKeyChecking", "no"); 
      session.setPassword(pass); 
      session.connect(); 

      channel = session.openChannel("sftp"); 
      channel.connect(); 
      sftpChannel = (ChannelSftp) channel; 
      sftpChannel.cd(SFTPWORKINGDIR); //cd to dir that contains file 

      try { 
       byte[] buffer = new byte[1024]; 
       BufferedInputStream bis = new BufferedInputStream(sftpChannel.get(fileName)); 
       File newFile = new File("some/file/"); 
       OutputStream os = new FileOutputStream(newFile); //CRASHES HERE 
       BufferedOutputStream bos = new BufferedOutputStream(os); 
       int readCount; 
       while((readCount = bis.read(buffer)) > 0) { 
        Log.d("Downloading", " " + fileName); 
        bos.write(buffer, 0, readCount); 
       } 
       bis.close(); 
       bos.close(); 

      } catch (FileNotFoundException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 

      Log.d(" ", fileName + " has been downloaded. MAYBE"); 

      sftpChannel.exit(); 
      session.disconnect(); 

     } catch (JSchException e) { 
      e.printStackTrace(); 
     } catch (SftpException e) { 
      e.printStackTrace(); 
     } 
    } 

} 

Answer 1

我想我可能会通过指定的外部存储有固定的：

File path = Environment.getExternalStoragePublicDirectory(
        Environment.DIRECTORY_DOCUMENTS); 
      File newFile = new File(path, "/" + fileName);