SSH登录到远程linux机器并执行命令

一、

1、JSch是Java Secure Channel的缩写。JSch是一个SSH2的纯Java实现。它允许你连接到一个SSH服务器，并且可以使用端口转发，X11转发，文件传输等，当然你也可以集成它的功能到你自己的应用程序。

<dependency>
    <groupId>com.jcraft</groupId>
    <artifactId>jsch</artifactId>
    <version>0.1.53</version>
</dependency>

<dependency>
    <groupId>com.github.cverges.expect4j</groupId>
    <artifactId>expect4j</artifactId>
    <version>1.9</version>
</dependency>

二、代码样例

参考链接：http://www.cnblogs.com/xuxiuxiu/p/6266583.html

import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;

import org.apache.log4j.Logger;
import org.apache.oro.text.regex.MalformedPatternException;

import com.jcraft.jsch.ChannelShell;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.UserInfo;

import expect4j.Closure;
import expect4j.Expect4j;
import expect4j.ExpectState;
import expect4j.matches.EofMatch;
import expect4j.matches.Match;
import expect4j.matches.RegExpMatch;
import expect4j.matches.TimeoutMatch;

public class Shell {

    private static Logger log = Logger.getLogger(Shell.class);

    private Session session;
    private ChannelShell channel;
    private static Expect4j expect = null;
    private static final long defaultTimeOut = 1000;
    private StringBuffer buffer=new StringBuffer();

    public static final int COMMAND_EXECUTION_SUCCESS_OPCODE = -2;
    public static final String BACKSLASH_R = "\r";
    public static final String BACKSLASH_N = "\n";
    public static final String COLON_CHAR = ":";
    public static String ENTER_CHARACTER = BACKSLASH_R;
    public static final int SSH_PORT = 22;

    //正则匹配，用于处理服务器返回的结果
    public static String[] linuxPromptRegEx = new String[] { "~]#", "~#", "#",
            ":~#", "/$", ">" };

    public static String[] errorMsg=new String[]{"could not acquire the config lock "};

    //ssh服务器的ip地址
    private String ip;
    //ssh服务器的登入端口
    private int port;
    //ssh服务器的登入用户名
    private String user;
    //ssh服务器的登入密码
    private String password;

    public Shell(String ip,int port,String user,String password) {
        this.ip=ip;
        this.port=port;
        this.user=user;
        this.password=password;
        expect = getExpect();
    }

    /**
     * 关闭SSH远程连接
     */
    public void disconnect(){
        if(channel!=null){
            channel.disconnect();
        }
        if(session!=null){
            session.disconnect();
        }
    }

    /**
     * 获取服务器返回的信息
     * @return 服务端的执行结果
     */
    public String getResponse(){
        return buffer.toString();
    }

    //获得Expect4j对象，该对用可以往SSH发送命令请求
    private Expect4j getExpect() {
        try {
            log.debug(String.format("Start logging to %s@%s:%s",user,ip,port));
            JSch jsch = new JSch();
            session = jsch.getSession(user, ip, port);
            session.setPassword(password);

            Hashtable<String, String> config = new Hashtable<String, String>();
            config.put("StrictHostKeyChecking", "no");
            session.setConfig(config);

            localUserInfo ui = new localUserInfo();
            session.setUserInfo(ui);
　　　　　　session.connect();
　　　　　　　
　　　　　　// 建立通信通道
            channel = (ChannelShell) session.openChannel("shell");
            Expect4j expect = new Expect4j(channel.getInputStream(), channel.getOutputStream());
            channel.connect();
            log.debug(String.format("Logging to %s@%s:%s successfully!",user,ip,port));
            return expect;
        } catch (Exception ex) {
            log.error("Connect to "+ip+":"+port+"failed,please check your username and password!");
            ex.printStackTrace();
        }
        return null;
    }

    /**
     * 执行配置命令
     * @param commands 要执行的命令，为字符数组
     * @return 执行是否成功
     */
    public boolean executeCommands(String[] commands) {
        //如果expect返回为0，说明登入没有成功
        if(expect==null){
            return false;
        }

        log.debug("----------Running commands are listed as follows:----------");
        for(String command:commands){
            log.debug(command);
        }
        log.debug("----------End----------");

        Closure closure = new Closure() {
            public void run(ExpectState expectState) throws Exception
            {
                buffer.append(expectState.getBuffer());
                expectState.exp_continue();
            }
        };
        List<Match> lstPattern = new ArrayList<Match>();
        String[] regEx = linuxPromptRegEx;
        if (regEx != null && regEx.length > 0) {
            synchronized (regEx) {
                for (String regexElement : regEx)
　　　　　　　　　{
                    try {
                        RegExpMatch mat = new RegExpMatch(regexElement, closure);
                        lstPattern.add(mat);
                    } catch (MalformedPatternException e) {
                        return false;
                    } catch (Exception e) {
                        return false;
                    }
                }
                lstPattern.add(new EofMatch(new Closure() {
                            public void run(ExpectState state) {
                            }
                        }));
                lstPattern.add(new TimeoutMatch(defaultTimeOut, new Closure() {
                    public void run(ExpectState state) {
                    }
                }));
            }
        }
        try {
            boolean isSuccess = true;
            for (String strCmd : commands){
                isSuccess = isSuccess(lstPattern, strCmd);
            }
            //防止最后一个命令执行不了
            isSuccess = !checkResult(expect.expect(lstPattern));

            //找不到错误信息标示成功
            String response=buffer.toString().toLowerCase();
            for(String msg:errorMsg){
                if(response.indexOf(msg)>-1){
                    return false;
                }
            }

            return isSuccess;
        } catch (Exception ex) {
            ex.printStackTrace();
            return false;
        }
    }

    //检查执行是否成功
    private boolean isSuccess(List<Match> objPattern, String strCommandPattern) {
        try {
            boolean isFailed = checkResult(expect.expect(objPattern));
            if (!isFailed) {
                expect.send(strCommandPattern);
                expect.send("\r");
                return true;
            }
            return false;
        } catch (MalformedPatternException ex) {
            return false;
        } catch (Exception ex) {
            return false;
        }
    }

    //检查执行返回的状态
    private boolean checkResult(int intRetVal) {
        if (intRetVal == COMMAND_EXECUTION_SUCCESS_OPCODE) {
            return true;
        }
        return false;
    }

    //登入SSH时的控制信息
    //设置不提示输入密码、不显示登入信息等
    public static class localUserInfo implements UserInfo {
        String passwd;

        public String getPassword() {
            return passwd;
        }

        public boolean promptYesNo(String str) {
            return true;
        }

        public String getPassphrase() {
            return null;
        }

        public boolean promptPassphrase(String message) {
            return true;
        }

        public boolean promptPassword(String message) {
            return true;
        }

        public void showMessage(String message) {

        }
    }

}