用java把服务器某个目录日志实时打印出来

1.引入第三方包

<dependency>
    <groupId>com.jcraft</groupId>
    <artifactId>jsch</artifactId>
    <version>0.1.55</version>
</dependency>

2.代码如下

import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

public class MySQLPortForwarding {
    public static void main(String[] args) throws Exception{
        String sshHost = ""; //服务器ip
        String sshUsername = ""; //用户名称
        String sshPassword = ""; //用户密码
        String remoteHost = "localhost";
        int localPort = 3307; // 本地端口
        int remotePort = 3306; // 远程MySQL服务器端口

        JSch jsch = new JSch();
        Session session = jsch.getSession(sshUsername, sshHost, 22);
        session.setPassword(sshPassword);
        session.setConfig("StrictHostKeyChecking", "no");
        System.out.println("建立SSH连接...");
        session.connect();
       /*  //这步是做端口转发的，与文章无关，目的：服务器安装的有mysql，然后防火墙没开3306，本地无法直接连接mysql，
        // 这一步本地可以用过localhost:3307连接服务器的mysql
        int assignedPort = session.setPortForwardingL(localPort, remoteHost, remotePort);
        System.out.println("本地端口 " + assignedPort + " 被转发到 " + remoteHost + ":" + remotePort);*/
        String command = "tail -f " + "/tmp/debug.log";
        ChannelExec channel = (ChannelExec) session.openChannel("exec");
        channel.setCommand(command);

        InputStream in = channel.getInputStream();
        channel.connect();

        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        String line;
        while ((line = reader.readLine()) != null) {
            System.out.println(line); // 实时打印日志内容
        }

        channel.disconnect();
        session.disconnect();
    }

}