如何在java中查找在端口号上运行的进程的进程id

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.BindException;
import java.net.ServerSocket;

public class FindProcessID {
    public static void main(String[] args) {
        int port = 8080; // 指定要查找的端口号

        try {
            ServerSocket serverSocket = new ServerSocket(port);
            serverSocket.close(); // 如果端口未被占用，则立即关闭ServerSocket对象
            System.out.println("端口 " + port + " 未被占用");
        } catch (BindException e) {
            String errorMessage = e.getMessage();
            System.out.println("端口 " + port + " 已被占用");

            // 解析错误消息，获取进程ID
            String processID = parseProcessID(errorMessage);
            System.out.println("占用该端口的进程ID为：" + processID);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static String parseProcessID(String errorMessage) {
        String processID = "";

        // 根据操作系统类型选择相应的命令
        String command = "";
        String os = System.getProperty("os.name").toLowerCase();
        if (os.contains("win")) {
            command = "tasklist /FI \"PID eq " + errorMessage + "\"";
        } else if (os.contains("nix") || os.contains("nux") || os.contains("mac")) {
            command = "lsof -i :" + errorMessage + " | grep LISTEN";
        }

        try {
            Process process = Runtime.getRuntime().exec(command);
            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String line;
            while ((line = reader.readLine()) != null) {
                // 解析命令输出，获取进程ID
                processID = line.split("\\s+")[1];
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return processID;
    }
}