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用java把服务器某个目录日志实时打印出来

news 2025/8/2 7:13:52

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ipString 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mysqlint 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();}}