Java关于SSH连接Linux系统

先给一份样例：

package com.log;

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

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

public class Test8 {
    
    /**
     * 连接linux系统
     * @param args
     */
    public static void main(String[] args) {
        try {
            Connection conn = new Connection("192.168.81.129");
            conn.connect();
            boolean isAuthenticated = conn.authenticateWithPassword("root",
            "123456");
            if (isAuthenticated == false) {
            throw new IOException("Authentication failed");
            }
            Session sess = conn.openSession();
            sess.requestPTY("bash");
            sess.startShell();
            InputStream stdout = new StreamGobbler(sess.getStdout());
            InputStream stderr = new StreamGobbler(sess.getStderr());
            BufferedReader stdoutReader = new BufferedReader(
            new InputStreamReader(stdout));
            BufferedReader stderrReader = new BufferedReader(
            new InputStreamReader(stderr));
            BufferedReader inputReader = new BufferedReader(
            new InputStreamReader(System.in));
            PrintWriter out = new PrintWriter(sess.getStdin());
            String temp = "";
            while (!temp.equals("exit")) {
            System.out.print("[root@vmone ~]#");
            temp = inputReader.readLine();
            out.println(temp);
            out.flush();
            String line = null;
            while ((line = stdoutReader.readLine()) != null) {
            if (line.length() == 0) {// line等于null从来不会发生，导致程序卡在这里
            continue;
            } else{
            System.out.println(line);
            }
            }
            System.out.println("Here is the output from stderr:");
            while (true) {
            line = stderrReader.readLine();
            if (line == null)
            break;
            System.out.println(line);
            }
            }
            System.out.println("ExitCode: " + sess.getExitStatus());
            sess.close();
            conn.close();
            System.out.println("close connection");
            } catch (IOException e) {
            e.printStackTrace(System.err);
            System.exit(2);
            }
    }
    

}

基本流程就是：

1.开启一个连接，创建一个Connection对象

//准备一个新Connection对象，然后可以使用该对象建立与指定SSH-2服务器的连接。
Connection(java.lang.String hostname)

//准备一个新Connection对象，然后可以使用该对象建立与指定SSH-2服务器的连接
Connection(java.lang.String hostname, int port)      

2.进行身份认证

3.新建一个session

4.执行具体命令

5.获取错误输出和标准输出

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 SSHTest{
	public static void main(String[] args) {
		String hostname = "192.168.192.128";
		String username = "root";
		String password = "root";
 
		try {
			Connection conn = new Connection(hostname);
			conn.connect();
            //进行身份认证
			boolean isAuthenticated = conn.authenticateWithPassword(
					username,password);
			if (isAuthenticated == false)
				throw new IOException("Authentication failed.");
            //开启一个Session
			Session sess = conn.openSession();
            //执行具体命令
			sess.execCommand("cat haha.txt");
            //获取返回输出
			InputStream stdout = new StreamGobbler(sess.getStdout());
            //返回错误输出
			InputStream stderr = new StreamGobbler(sess.getStderr());
			BufferedReader stdoutReader = new BufferedReader(
					new InputStreamReader(stdout));
			BufferedReader stderrReader = new BufferedReader(
					new InputStreamReader(stderr));
			
			System.out.println("Here is the output from stdout:");
			while (true) {
				String line = stdoutReader.readLine();
				if (line == null)
					break;
				System.out.println(line);
			}
 
			System.out.println("Here is the output from stderr:");
			while (true) {
				String line = stderrReader.readLine();
				if (line == null)
					break;
				System.out.println(line);
			}
            //关闭Session
			sess.close();
            //关闭Connection
			conn.close();
		} catch (IOException e) {
			e.printStackTrace(System.err);
			System.exit(2);
		}
	}
}