Get and monitor remote server logs

test JSch

Original address ：https://www.freesion.com/article/3557457395/

POM To configure

  <dependencies>
    <dependency>
      <groupId>com.jcraft</groupId>
      <artifactId>jsch</artifactId>
      <version>0.1.51</version>
    </dependency>
    <dependency>
      <groupId>org.apache.maven.archetype</groupId>
      <artifactId>maven-archetype</artifactId>
      <version>3.1.2</version>
    </dependency>
  </dependencies>

Function entrance

import com.jcraft.jsch.JSchException;

import java.io.IOException;

public class Hellossh {

    public static String host = "10.211.55.3";
    public static String username = "parallels";
    public static String password = "WW731298";

    public static void main(String[] args) throws IOException, JSchException {
        String command1 = "head -n 1  /home/admin/logs/*.log";
        // Execute input information 
        JSchUtil js = new JSchUtil(username, password, host, 22);
        js.Connection();
        js.executeCmd(command1);
    }
}

UTIL class

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;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;

public class JSchUtil {
    // Initialize variables in class 
    private int SSH_PORT;
    private String username;
    private String password;
    private String hostip;
    private String charset = "UTF-8";
    private Session session;

    public JSchUtil(String user, String password, String hostip, int port) {
        this.username = user;
        this.password = password;
        this.hostip = hostip;
        this.SSH_PORT = port;
    }

    /*
     Connect to the specified IP
     */
    public void Connection() throws JSchException {
        JSch js = new JSch();
        session = js.getSession(username, hostip, SSH_PORT);
        session.setPassword(password);
        session.setConfig("StrictHostKeyChecking", "no");
        session.setTimeout(3000);
        session.connect();
    }

    /*
     Close instance link 
     */
    public void disconnection() {
        if (session != null && session.isConnected()) {
            session.disconnect();
        }
    }

    /*
     perform ssh The command interface 
     */
    public void executeCmd(String command) throws JSchException, IOException {
        BufferedReader reader = null;
        Channel channel = null;
        System.out.println("**********************************");
        System.out.println("InputCommand:" + "【" + command + "】");
        System.out.println("**********************************");
        channel = session.openChannel("exec");
        ((ChannelExec) channel).setCommand(command);
        channel.setInputStream(null);
        ((ChannelExec) channel).setErrStream(System.err);
        channel.connect();
        InputStream in = channel.getInputStream();
        reader = new BufferedReader(new InputStreamReader(in,
                Charset.forName(charset)));
        String buf = null;
        System.out.println("OutPutResult:" + "\n");
        StringBuffer buffer = new StringBuffer();
        while ((buf = reader.readLine()) != null) {
            System.out.println(buf);
            buffer.append(buf);
            buffer.append("\n");
        }
        System.out.println("**********************************");
        // The test results can be returned for regular matching and logical judgment 
        System.out.println("ReturnResult:" + "\n" + buffer.toString());
        channel.disconnect();
    }
}

java Remote monitoring server memory 、 disk 、 Swap space 、cpu It's about the utilization of