【JAVA笔记】使用ganymed-ssh2-build210.jar访问Linux虚拟主机获取数据

这次的任务是，要我使用SSH2协议连接本地机与远程主机，并获取相应的数据。

因为不能拿真的主机做实验，所以我用Liunx虚拟机代替一下，主要还是学习怎么使用这个东西。

zip里给了几个example，看一下最基础的Basic就能大概清楚工作流程了。

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.Session;
import ch.ethz.ssh2.StreamGobbler;

public class Basic
{
	public static void main(String[] args)
	{
		String hostname = "127.0.0.1";
		String username = "joe";
		String password = "joespass";

		try
		{
			/* Create a connection instance */

			Connection conn = new Connection(hostname);

			/* Now connect */

			conn.connect();

			/* Authenticate.
			 * If you get an IOException saying something like
			 * "Authentication method password not supported by the server at this stage."
			 * then please check the FAQ.
			 */

			boolean isAuthenticated = conn.authenticateWithPassword(username, password);

			if (isAuthenticated == false)
				throw new IOException("Authentication failed.");

			/* Create a session */

			Session sess = conn.openSession();

			sess.execCommand("uname -a && date && uptime && who");

			System.out.println("Here is some information about the remote host:");

			/* 
			 * This basic example does not handle stderr, which is sometimes dangerous
			 * (please read the FAQ).
			 */

			InputStream stdout = new StreamGobbler(sess.getStdout());

			BufferedReader br = new BufferedReader(new InputStreamReader(stdout));

			while (true)
			{
				String line = br.readLine();
				if (line == null)
					break;
				System.out.println(line);
			}

			/* Show exit status, if available (otherwise "null") */

			System.out.println("ExitCode: " + sess.getExitStatus());

			/* Close this session */

			sess.close();

			/* Close the connection */

			conn.close();

		}
		catch (IOException e)
		{
			e.printStackTrace(System.err);
			System.exit(2);
		}
	}
}

考虑到任务需要连续执行多条指令，所以每次都“连接 —— 开connection —— 开SESSION —— 关”就觉得很麻烦，而且判断能否与主机连接一次就够了。所以改了一下

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.log4j.Logger;

import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.Session;
import ch.ethz.ssh2.StreamGobbler;

/**
 * 

 * Title: CommandRunner.java
 * 
 * 
 * @author wang.yd
 * @version 1.0 创建时间：2013-12-31 上午09:55:11
 */
public class CommandRunner 
{

	private static final Logger LOGGER = Logger.getLogger(CommandRunner.class);

	// ///////////// PROPERTIES ///////////////

	private String hostname;
	private String user;
	private String password;
	private Connection conn;
	private Session session = null;

	// ///////////// METHODS ///////////////

	public boolean connect() 
	{

		try 
		{
			conn = new Connection(hostname);
			conn.connect();

			boolean isAuthenticated = conn.authenticateWithPassword(user,
					password);

			if (isAuthenticated == false) 
			{
				throw new IOException("Authentication failed.");
			} 
			else 
			{
				System.out.println("Login success");
				return true;
			}

		} 
		catch (IOException e) 
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}

	public InputStream command(String command, boolean print)
	// command：输入的指令 print：是否控制台打印结果
	{

		try 
		{

			session = conn.openSession();

			session.execCommand(command);// execute command

			// System.out
			// .println("Here is some information about the remote host:");

			InputStream stdout = new StreamGobbler(session.getStdout());

			BufferedReader br = new BufferedReader(
					new InputStreamReader(stdout));

			while (print) 
			{
				String line = br.readLine();
				if (line == null) 
				{
					break;
				}
				System.out.println(line);
			}

			// System.out.println("ExitCode: " + session.getExitStatus());

			return stdout;

		} 
		catch (IOException e) 
		{
			// TODO Auto-generated catch block
			e.printStackTrace(System.err);
			System.exit(2);
		} 
		finally 
		{
			session.close();
		}
		return null;
	}

	public void close() 
	{
		if (conn != null) 
		{
			conn.close();
		}
	}

	/////////////// GETER & SETER ///////////////
	
	......

}

 

问题：比如，执行cd ..指令之后再执行一条ls指令

可以写成：cd ..\nls

但不能连续两次分别执行。比如：command("cd ..",false);command("ls",false);

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