使用SSHJ库通过java代码连接sshd服务

package cn.com.ultrapower.utils;

import java.io.IOException;
import java.security.PublicKey;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;

import com.hierynomus.sshj.transport.kex.DHGroups;
import com.hierynomus.sshj.transport.kex.ExtendedDHGroups;

import net.schmizz.sshj.DefaultConfig;
import net.schmizz.sshj.SSHClient;
import net.schmizz.sshj.common.Factory.Named;
import net.schmizz.sshj.common.IOUtils;
import net.schmizz.sshj.connection.ConnectionException;
import net.schmizz.sshj.connection.channel.direct.Session;
import net.schmizz.sshj.connection.channel.direct.Session.Command;
import net.schmizz.sshj.transport.TransportException;
import net.schmizz.sshj.transport.compression.Compression;
import net.schmizz.sshj.transport.compression.DelayedZlibCompression;
import net.schmizz.sshj.transport.compression.NoneCompression;
import net.schmizz.sshj.transport.compression.ZlibCompression;
import net.schmizz.sshj.transport.kex.Curve25519SHA256;
import net.schmizz.sshj.transport.kex.DHGexSHA1;
import net.schmizz.sshj.transport.kex.DHGexSHA256;
import net.schmizz.sshj.transport.kex.ECDHNistP;
import net.schmizz.sshj.transport.kex.KeyExchange;
import net.schmizz.sshj.transport.verification.HostKeyVerifier;
import net.schmizz.sshj.userauth.UserAuthException;

public class Connect2SSHDWithSSHJ {
    public static void main(String args[]){
    	//ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256
    	String host = "IP地址"; 
    	int port = 22;
    	int timeout = 10;
        String username = "用户名";  
        String password = "密码"; 
        try {
			connSSHD(username, password, host, port, timeout);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    	//diffie-hellman-group15-sha256
    	System.out.println(ExtendedDHGroups.Group15SHA256().getName());
    	//[email protected]
    	System.out.println(ExtendedDHGroups.Group15SHA256AtSSH().getName());
    }
    
    public static void connSSHD(String username,String password,String host,int port,int timeout)
    		throws IOException{
    	DefaultConfig defaultConfig = new DefaultConfig();
    	defaultConfig.setKeyExchangeFactories(Arrays.>asList(
    			ExtendedDHGroups.Group18SHA512AtSSH(),
    			ExtendedDHGroups.Group16SHA512AtSSH(),
    			ExtendedDHGroups.Group16SHA384AtSSH(),
    			ExtendedDHGroups.Group16SHA256(),
    			ExtendedDHGroups.Group15SHA384AtSSH(),
    			ExtendedDHGroups.Group15SHA256AtSSH(),
    			ExtendedDHGroups.Group15SHA256(),
    			ExtendedDHGroups.Group14SHA256AtSSH(),
    			new Curve25519SHA256.Factory(),
    			new ECDHNistP.Factory521(),
    			new ECDHNistP.Factory384(),
    			new ECDHNistP.Factory256(),
    			new DHGexSHA256.Factory(),
    			new DHGexSHA1.Factory(),
    			DHGroups.Group18SHA512(),
    			DHGroups.Group17SHA512(),
    			DHGroups.Group16SHA512(),
    			DHGroups.Group15SHA512(),
    			DHGroups.Group14SHA256(),
    			DHGroups.Group14SHA1(),
    			DHGroups.Group1SHA1()));
    	//如果客户端和服务器端的压缩算法不一致，将导致connect timed out，连三次握手都没有建立
    	defaultConfig.setCompressionFactories(Arrays.>asList(
//    			new ZlibCompression.Factory()//,
//    			new NoneCompression.Factory(),
    			new DelayedZlibCompression.Factory()
    			));
    	SSHClient sshclt = new SSHClient(defaultConfig);
    	
    	sshclt.addHostKeyVerifier(  
    		    new HostKeyVerifier() {
					
					@Override
					public boolean verify(String arg0, int arg1, PublicKey arg2) {
						// TODO Auto-generated method stub
						return false;
					}
					
					@Override
					public List findExistingAlgorithms(String arg0, int arg1) {
						// TODO Auto-generated method stub
						return null;
					}
				});
    	//使用上面的代码替代，因为这里有HostKeyVerifier，忽略之
//    	sshclt.loadKnownHosts();
    	
//    	sshclt.setTimeout(timeout);
    	//上面那个超时时间函数不管用
    	sshclt.setConnectTimeout(timeout);
    	sshclt.connect(host, port);
    	
    	try {
			sshclt.authPassword(username, password);
			Session session  = sshclt.startSession();
			try {
				Command cmd = session.exec("uname -a && date && uptime && w");
				System.out.println(IOUtils.readFully(cmd.getInputStream()).toString());
				cmd.join(5, TimeUnit.SECONDS);
				System.out.println("\n** exit status: " + cmd.getExitStatus());
				cmd.close();
			} catch (ConnectionException e)  {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally{
	            session.close();
			}
		} catch (UserAuthException | TransportException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
            sshclt.disconnect();
        }
    }
}