only one instance

중복실행방지

멤버변수 생성

/** 앱 중복실행방지용 */
private static ServerSocket onlyOncInstanceSocket;

main 시작할때 소켓 열수 있는지 확인

public static void main(String[] args) {
	try {
		onlyOncInstanceSocket = new ServerSocket(65535, 1, InetAddress.getLocalHost());
		System.out.println("[main] First run. Keep this Processor");
	} catch (Exception e) {
		System.out.println("[main] Duplicated run. Exit Program");
		return;
	}