SshTerminal

package com.network.ssh;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.InetSocketAddress;

import org.apache.sshd.ClientChannel;
import org.apache.sshd.ClientSession;
import org.apache.sshd.SshClient;
import org.apache.sshd.client.future.AuthFuture;
import org.apache.sshd.common.util.NoCloseInputStream;
import org.apache.sshd.common.util.NoCloseOutputStream;

public class SshTerminal {
    public static final int DEFAULT_SSH_PORT = 22;
    public static final String ENTER = "\r";
    public static final String EXIT = "exit";
    private SshClient client;
    private ClientSession session;
    private ClientChannel channel;
    private ByteArrayInputStream input;
    private ByteArrayOutputStream output;
    private StringBuffer remoteInfo = new StringBuffer();
    private boolean isLogin = false;
    public SshTerminal() {
        client = SshClient.setUpDefaultClient();
        client.start();
    }
    public boolean login(String ip,String userName,String password) throws InterruptedException, IOException{
        return login(ip, DEFAULT_SSH_PORT, userName, password);
    }
    
    public boolean login(String ip,int port,String userName,String password) throws InterruptedException, IOException{
        closeSession();
        session = client.connect(userName, new InetSocketAddress(ip, port)).await().getSession();
        session.addPasswordIdentity(password);
        AuthFuture future = session.auth().await();
        isLogin = future.isSuccess();
        return isLogin;
    }
    
    public void runCMD(String...scripts) throws Exception{
        if(!isLogin) throw new Exception("not login!");
        StringBuffer buffer = new StringBuffer();
        for(String cmd : scripts){
            buffer.append(cmd.trim()).append(ENTER);
        }
        /**
         * createShellChannel() create a blocking channel ,use exit release
         */
        buffer.append(EXIT).append(ENTER);
        closeChannel();
        input = new ByteArrayInputStream(buffer.toString().getBytes());
        channel = session.createShellChannel();
        channel.setIn(new NoCloseInputStream(input));
        open();
    }
    
    public void runCMD(String cmd) throws Exception{
        if(!isLogin) throw new Exception("not login!");
        closeChannel();
        channel = session.createExecChannel(cmd);
        open();
    }
    private void open() throws IOException{
        //session will close,so need to new
        output = new ByteArrayOutputStream();
        channel.setOut(new NoCloseOutputStream(output));
        channel.setErr(new NoCloseOutputStream(output));
        channel.open();
        channel.waitFor(ClientChannel.CLOSED, 0);
    }
    
    private void closeStream(){
        try{
            if(input != null){
                input.close();
                input = null;
            }
            if(output != null){
                remoteInfo.append(output.toString());
                output.close();
                output = null;
            }
        }catch(IOException e){
            e.printStackTrace();
        }
    }
    
    private void closeChannel(){
        closeStream();
        if(channel != null){
            channel.close(true);
            channel = null;
        }    
    }
    
    private void closeSession(){
        closeChannel();
        if (session != null) {
            session.close(true);
            session = null;
        }
    }
    
    public void destory() {
        closeSession();
        client.stop();
        client = null;
    }
    public String getRemoteInfo() throws Exception{
        //the end od if the output not close
        if(output != null) remoteInfo.append(output.toString());
        return remoteInfo.toString();
    }
}