如何从现有的连接到Unix服务器连接到FTP服务器？ [英] How to connect to an FTP server from an existing connection to Unix server?

问题描述

目前我正在使用 Reflection for Unix和OpenVMS 。我连接到一个Unix服务器。一旦连接，我建立一个新的FTP连接到目标服务器。以下是控制台窗口的样子：

$ b

  login：xxx 
 Password：xxx 
 //现在我连接到UNIX 
 //下一步我连接到该FTP 
 ftpLogin @ hostName：/ whatever /.../ $ ftp someftp.example.com 
 Conencted 
名称：myLogin 
密码：
 XXX 
登录OK 
  

---

我尝试以编程方式复制相同的步骤，但对这种双重连接感到困惑。我只能连接到Unix，但是我不知道如何继续。

  JSch jsch = new JSch（）; 
会话会话= jsch.getSession（user，host，port）; 
 session.setPassword（password）; 
 session.setConfig（StrictHostKeyChecking，no）; 
 System.out.println（建立连接...）; 
 session.connect（）; 
  

现在我已连接到Unix，我该如何继续执行 ftpLogin @ hostName：/ whatever /.../ $ ftp someftp.example.com ？

我想我可能只需要发送一个命令，就像

  sftpChannel.setCommand（ftpLogin @ hostName：/ whatever /.../ $ ftp someftp.example.com？）
  

如何从现有的会话/连接连接到单独的FTP？ / div>

为此，您通常使用本地端口转发。

在JSch中，连接后，调用 setPortForwardingL ：

  int ftpPort = session.setPortForwardingL（0，someftp.example.com，21）; 
  

然后连接一个本地FTP客户端（例如 FTPClient 来自Apache Commons ）到 localhost：ftpPort ：

  FTPClient ftp = new FTPClient（）; 
 ftp.connect（localhost，ftpPort）; 
 ftp.login（myLogin，密码）; 
  

Currently I am using Reflection for Unix and OpenVMS. I connect to a Unix server. Once connected, I establish a new FTP connection to the target server. Here is how the console window look like:

login: xxx 
Password : xxx 
// Now I'm connected to UNIX
// Next I am connecting to that FTP 
ftpLogin@hostName :/whatever/.../ $ ftp someftp.example.com 
Conencted 
Name: myLogin 
Password: 
XXX 
Login OK 

---

I tried to replicate the same steps programmatically, but got confused with this "double connection" thing. I was able to connect to Unix only, but then I don't know how to proceed.

JSch jsch = new JSch();
Session session = jsch.getSession(user, host, port);
    session.setPassword(password);
    session.setConfig("StrictHostKeyChecking", "no");
System.out.println("Establishing Connection...");
session.connect(); 

Now that I am connected to Unix, how do I proceed with this step ftpLogin@hostName :/whatever/.../ $ ftp someftp.example.com?

I think I might only need to send a command, something like

sftpChannel.setCommand("ftpLogin@hostName :/whatever/.../ $ ftp someftp.example.com ?") 

How can I connect to a separate FTP from an existing "session/connection"?

解决方案

You typically use the local port forwarding for this.

In JSch, after you connect, call the setPortForwardingL:

int ftpPort = session.setPortForwardingL(0, "someftp.example.com", 21);

And then connect a local FTP client (e.g. the FTPClient from Apache Commons) to the localhost:ftpPort:

FTPClient ftp = new FTPClient();
ftp.connect("localhost", ftpPort);
ftp.login("myLogin", password);

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