Detailed introduction to java connecting to the server through ssh to execute shell commands and sample code

package com.stormma.demo;
 
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
 
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
 
public class Shell {
  //远程主机的ip地址
  private String ip;
  //远程主机登录用户名
  private String username;
  //远程主机的登录密码
  private String password;
  //设置ssh连接的远程端口
  public static final int DEFAULT_SSH_PORT = 22; 
  //保存输出内容的容器
  private ArrayList<string> stdout;
 
  /**
   * 初始化登录信息
   * @param ip
   * @param username
   * @param password
   */
  public Shell(final String ip, final String username, final String password) {
     this.ip = ip;
     this.username = username;
     this.password = password;
     stdout = new ArrayList<string>();
  }
  /**
   * 执行shell命令
   * @param command
   * @return
   */
  public int execute(final String command) {
    int returnCode = 0;
    JSch jsch = new JSch();
    MyUserInfo userInfo = new MyUserInfo();
 
    try {
      //创建session并且打开连接，因为创建session之后要主动打开连接
      Session session = jsch.getSession(username, ip, DEFAULT_SSH_PORT);
      session.setPassword(password);
      session.setUserInfo(userInfo);
      session.connect();
 
      //打开通道，设置通道类型，和执行的命令
      Channel channel = session.openChannel("exec");
      ChannelExec channelExec = (ChannelExec)channel;
      channelExec.setCommand(command);
 
      channelExec.setInputStream(null);
      BufferedReader input = new BufferedReader(new InputStreamReader
          (channelExec.getInputStream()));
 
      channelExec.connect();
      System.out.println("The remote command is :" + command);
 
      //接收远程服务器执行命令的结果
      String line;
      while ((line = input.readLine()) != null) { 
        stdout.add(line); 
      } 
      input.close(); 
 
      // 得到returnCode
      if (channelExec.isClosed()) { 
        returnCode = channelExec.getExitStatus(); 
      } 
 
      // 关闭通道
      channelExec.disconnect();
      //关闭session
      session.disconnect();
 
    } catch (JSchException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (Exception e) {
      e.printStackTrace();
    }
    return returnCode;
  }
  /**
   * get stdout
   * @return
   */
  public ArrayList<string> getStandardOutput() {
    return stdout;
  }
 
  public static void main(final String [] args) { 
    Shell shell = new Shell("xxx.xxx.xxx.xxx", "username", "password");
    shell.execute("uname -s -r -v");
 
    ArrayList<string> stdout = shell.getStandardOutput();
    for (String str : stdout) { 
      System.out.println(str); 
    } 
  } 
}

package com.stormma.demo;
 
import com.jcraft.jsch.UserInfo;
 
public class MyUserInfo implements UserInfo {
 
  @Override
  public String getPassphrase() {
    // TODO Auto-generated method stub
    System.out.println("MyUserInfo.getPassphrase()");
    return null;
  }
 
  @Override
  public String getPassword() {
    // TODO Auto-generated method stub
    System.out.println("MyUserInfo.getPassword()");
    return null;
  }
 
  @Override
  public boolean promptPassphrase(String arg0) {
    // TODO Auto-generated method stub
    System.out.println("MyUserInfo.promptPassphrase()");
    System.out.println(arg0);
    return false;
  }
 
  @Override
  public boolean promptPassword(String arg0) {
    // TODO Auto-generated method stub
    System.out.println("MyUserInfo.promptPassword()"); 
    System.out.println(arg0);
    return false;
  }
 
  @Override
  public boolean promptYesNo(String arg0) {
    // TODO Auto-generated method stub'
     System.out.println("MyUserInfo.promptYesNo()"); 
     System.out.println(arg0); 
     if (arg0.contains("The authenticity of host")) { 
       return true; 
     } 
    return true;
  }
 
  @Override
  public void showMessage(String arg0) {
    // TODO Auto-generated method stub
    System.out.println("MyUserInfo.showMessage()"); 
  }
 
}