[英]Java open new ssh connection from already existing
我是 JAVA 新手。 我試圖編寫一個應用程序,接下來將執行 - 打開到 UNIX 服務器的 ssh 連接,並使用私鑰從該服務器連接到另一台服務器。
要連接到第一台服務器,我正在使用如下程序:
public static void main(String args[])
{
String user = "john";
String password = "mypassword";
String host = "192.168.100.23";
int port=22;
try
{
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();
System.out.println("Connection established.");
System.out.println("Crating SFTP Channel.");
ChannelSftp sftpChannel = (ChannelSftp) session.openChannel("sftp");
sftpChannel.connect();
System.out.println("SFTP Channel created.");
InputStream out= null;
out= sftpChannel.get(remoteFile);
BufferedReader br = new BufferedReader(new InputStreamReader(out));
String line;
while ((line = br.readLine()) != null)
System.out.println(line);
br.close();
}
catch(Exception e){System.err.print(e);}
}
它工作正常。 但是當我嘗試使用相同的代碼連接到第二個時,這不起作用,因為應用程序試圖創建一個全新的連接而不使用已經創建的連接。
有人知道如何讓應用程序使用已創建的連接嗎?
謝謝。
您可以在第一個session
中使用端口轉發來做到這一點,然后在轉發的本地端口中創建另一個連接到主機的session
。 示例JumpHosts.java正是這樣做的。 公鑰認證參考UserAuthPubKey.java
這是基於這些示例對您的代碼的修改:
String user = "john";
String password = "mypassword";
String host = "127.0.0.1";
String host2 = "192.168.100.23";
int port=22;
try{
JSch jsch = new JSch();
Session session1 = jsch.getSession(user, host, port);
session1.setPassword(password);
session1.setConfig("StrictHostKeyChecking", "no");
System.out.println("Establishing Connection...");
session1.connect();
System.out.println("Connection established.");
//Here we do port forwarding to the second host
int assinged_port = session1.setPortForwardingL(0, host2, 22);
System.out.println("portforwarding: "+
"localhost:"+assinged_port+" -> "+host+":"+22);
//And here we connect to the first host to the forwarded port, not 22
Session session2 = jsch.getSession(user, host, assinged_port);
//This is your public key file
jsch.addIdentity("~/.ssh/id_rsa");
session2.setConfig("StrictHostKeyChecking", "no");
session2.connect();
System.out.println("The session has been established to "+
user+"@"+host);
System.out.println("Crating SFTP Channel.");
ChannelSftp sftpChannel = (ChannelSftp) session2.openChannel("sftp");
sftpChannel.connect();
System.out.println("SFTP Channel created.");
InputStream out= null;
out= sftpChannel.get(remoteFile);
BufferedReader br = new BufferedReader(new InputStreamReader(out));
String line;
while ((line = br.readLine()) != null)
System.out.println(line);
br.close();
}
catch(Exception e){System.err.print(e);}
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