Java: reading config.conf file

example config.conf

# http and https ports configuration
http_port = 48001
https_port = 48001

# printer port
printer_port=/dev/rfcomm0
# printer size
printer_size=80mm

java code

    // configuration file config.conf
    static final String linux_file_path = "/etc/dddtescpos/config.conf";
    static final String file_path = "./config.conf";

    public static String printer_port = null;
    public static String printer_size = null;
    
    public static int http_port = -1;
    public static int https_port = -1;
    
    public static void readConfig() {
        Path configFile = Paths.get(linux_file_path);
        
        if (Files.notExists(configFile)) {
            configFile = Paths.get(file_path);
        }
        
        // comment in config file will # or !
        Properties props = new Properties();

        try (InputStream input = Files.newInputStream(configFile)) {
            props.load(input);
        
            printer_port = props.getProperty("printer_port");
            printer_size = props.getProperty("printer_size");
            if (printer_size == null || printer_size.isBlank()) {
                printer_size = "80mm";   // default
            } else {
                printer_size = printer_size.trim().toLowerCase();

                if (!printer_size.equals("58mm")
                        && !printer_size.equals("80mm")) {
                    printer_size = "80mm";   // default for invalid value
                }
            }


            String tmpPort = props.getProperty("http_port","48001");
            try {
                int intTmpPort = Integer.parseInt(tmpPort); 
                if (intTmpPort<48000 || intTmpPort>65535)
                    intTmpPort = 48001;
                    http_port = intTmpPort;
            } catch (NumberFormatException ex) {
                http_port = 48001;
            }
            tmpPort = props.getProperty("https_port","48002");
            try {
                int intTmpPort = Integer.parseInt(tmpPort); 
                if (intTmpPort<48000 || intTmpPort>65535)
                    intTmpPort = 48002;
                https_port = intTmpPort;
            } catch (NumberFormatException ex) {
                https_port = 48002;
            }
            // if ports hava equal value, set default
            if (http_port == https_port) {
                http_port = 48001;
                https_port = 48002;
            }
        } catch (IOException ex) {
            System.out.println("No Configuration file found");
            http_port = 48001;
            https_port = 48002;            
        }
        
    }