java SSH访问linux服务器 并执行命令

1 .引入com.jcraft.jsch  jar

2.java代码  sshCommandUtil.java


import com.jcraft.jsch.*;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Vector;

public class SSHCommandUtil {
    private String ipAddress;
    private String username;
    private String password;
    public static final int DEFAULT_SSH_PORT = 22;
    private Vector<String> stdout;



    public SSHCommandUtil(final String ipAddress, final String username, final String password) {
        this.ipAddress = ipAddress;
        this.username = username;
        this.password = password;
        stdout = new Vector<String>();
    }

    public int execute(final String command) {
        int returnCode = 0;
        JSch jsch = new JSch();
        MyUserInfo userInfo = new MyUserInfo();

        try {
            // Create and connect session.
            Session session = jsch.getSession(username, ipAddress, DEFAULT_SSH_PORT);
            session.setPassword(password);
            session.setUserInfo(userInfo);
            session.connect();

            // Create and connect channel.
            Channel channel = session.openChannel("exec");
            ((ChannelExec) channel).setCommand(command);

            channel.setInputStream(null);
            BufferedReader input = new BufferedReader(new InputStreamReader(channel
                    .getInputStream()));

            channel.connect();
            System.out.println("The remote command is: " + command);

            // Get the output of remote command.
            String line;
            while ((line = input.readLine()) != null) {
                stdout.add(line);
            }
            input.close();

            // Get the return code only after the channel is closed.
            if (channel.isClosed()) {
                returnCode = channel.getExitStatus();
            }

            // Disconnect the channel and session.
            channel.disconnect();
            session.disconnect();
        } catch (JSchException e) {
            System.out.println("链接不到服务器，请确认服务器状态");
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return returnCode;
    }

    public Vector<String> getStandardOutput() {
        return stdout;
    }

  
    }

    /**
     * 根据服务ip,用户名，密码登录服务器并执行shell命令查看其内存和硬盘使用情况
     * @param ip
     * @param username
     * @param pwd
     * @return
     */
    public  static Vector<String>  getMemAndDisk(String ip,String username,String pwd){
        SSHCommandUtil sshCommandUtil = new SSHCommandUtil(ip, username, pwd);
        sshCommandUtil.execute("free -g| sed -n '2p;2q'");//获取内存信息
        sshCommandUtil.execute("df -h| sed -n '3p;3q'");//获取硬盘信息
        Vector<String> stdout = sshCommandUtil.getStandardOutput();
        return stdout;
    }
}


3.java 代码 MyUserInfo.java

import com.jcraft.jsch.UserInfo;

/**
* Created by lill on 2015/11/12.
*/
public class MyUserInfo implements UserInfo {
        private String password;

        private String passphrase;

        @Override
        public String getPassphrase() {
            System.out.println("MyUserInfo.getPassphrase()");
            return null;
        }

        @Override
        public String getPassword() {
            System.out.println("MyUserInfo.getPassword()");
            return null;
        }

        @Override
        public boolean promptPassphrase(final String arg0) {
            System.out.println("MyUserInfo.promptPassphrase()");
            System.out.println(arg0);
            return false;
        }

        @Override
        public boolean promptPassword(final String arg0) {
            System.out.println("MyUserInfo.promptPassword()");
            System.out.println(arg0);
            return false;
        }

        @Override
        public boolean promptYesNo(final String arg0) {
            System.out.println("MyUserInfo.promptYesNo()");
            System.out.println(arg0);
            if (arg0.contains("The authenticity of host")) {
                return true;
            }
            return false;
        }

        @Override
        public void showMessage(final String arg0) {
            System.out.println("MyUserInfo.showMessage()");
        }
    }



4.java 测试方法
/**
     * 测试方法
     * @param args
     */
    public static void main(final String [] args) {
        SSHCommandUtil sshCommandUtil = new SSHCommandUtil(ip, username,password);
        sshCommandUtil.execute("free -g| sed -n '2p;2q'");//获取内存信息
        sshCommandUtil.execute("df -h| sed -n '3p;3q'");//获取硬盘信息
        Vector<String> stdout=sshCommandUtil.getStandardOutput();
        int  i=0;
        for (String str : stdout) {
            if(i==0){
                //memList= RegexOroUtil.getAllResult(str, "[0-9]\\d*\\.?\\d*");//java正则形式拆分
                String tt[] = str.split("\\s{1,}");//按照空格分割字符串，多个空格作为一个空格对字符串进行分割 split形式
                System.out.print(tt);
            }else {

               // diskList = RegexOroUtil.getAllResult(str, "[0-9]\\d*\\.?\\d*");//java正则形式拆分
                String tt1[] = str.split("\\s{1,}");//按照空格分割字符串，多个空格作为一个空格对字符串进行分割 split形式
                System.out.print(tt1);
            }
            i++;
        }