用Java写一段远程重启服务的代码

要用Java实现远程重启服务，你可以使用Java的SSH库来连接到远程服务器并执行命令。下面是一个示例代码，可以重启远程Linux服务器的服务：

import com.jcraft.jsch.*;

public class RemoteServiceRestart {
    
    public static void main(String[] args) {
        String user = "your_username";
        String password = "your_password";
        String host = "your_host";
        int port = 22;
        
        try {
            JSch jsch = new JSch();
            Session session = jsch.getSession(user, host, port);
            session.setPassword(password);
            session.setConfig("StrictHostKeyChecking", "no");
            session.connect();
            
            String service = "your_service_name";
            String command = "sudo service " + service + " restart";
            
            Channel channel = session.openChannel("exec");
            ((ChannelExec) channel).setCommand(command);
            
            channel.setInputStream(null);
            ((ChannelExec) channel).setErrStream(System.err);
            
            InputStream in = channel.getInputStream();
            channel.connect();
            
            byte[] tmp = new byte[1024];
            while (true) {
                while (in.available() > 0) {
                    int i = in.read(tmp, 0, 1024);
                    if (i < 0) {
                        break;
                    }
                    System.out.print(new String(tmp, 0, i));
                }
                if (channel.isClosed()) {
                    if (in.available() > 0) {
                        continue;
                    }
                    System.out.println("Exit status: " + channel.getExitStatus());
                    break;
                }
                try {
                    Thread.sleep(1000);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            
            channel.disconnect();
            session.disconnect();
            
        } catch (JSchException | IOException e) {
            e.printStackTrace();
        }
    }
}

这段代码会连接到指定的远程服务器，并使用SSH协议执行`sudo service your_service_name restart`命令来重启指定的服务。请注意，为了使用sudo命令，你需要在远程服务器上具有sudo权限的用户。并且请注意，此代码将不会在Windows系统上运行。