从已知PID重新创建Java进程对象

public class ProcessCreator {
    public static void main(String[] args) throws IOException {
        int pid = 12345; // 已知的进程ID

        Process process = new ProcessBuilder()
                .command("java", "-jar", "yourJavaProgram.jar")
                .start();

        // 获取新创建的Java进程的PID
        long newPid = getProcessId(process);

        if (newPid == pid) {
            System.out.println("成功创建与PID " + pid + " 对应的Java进程对象。");
        } else {
            System.out.println("创建的Java进程对象与PID " + pid + " 不一致。");
        }
    }

    // 获取Java进程的PID
    private static long getProcessId(Process process) {
        long pid = -1;

        try {
            if (process.getClass().getName().equals("java.lang.UNIXProcess")) {
                Field pidField = process.getClass().getDeclaredField("pid");
                pidField.setAccessible(true);
                pid = pidField.getLong(process);
                pidField.setAccessible(false);
            }
        } catch (NoSuchFieldException | IllegalAccessException | IllegalArgumentException e) {
            e.printStackTrace();
        }

        return pid;
    }
}