DB_DRIVER=org.postgresql.Driver
DB_CONN_URL=jdbc\:postgresql\://127.0.0.1\:5432/zyzx
DB_USER=zyzx
DB_PASSWORD=zyzx

    public static String DRIVER;
    public static String URL;
    public static String USER;
static{
        FileInputStream in = null;
        try{
            String propertyPath = System.getProperty("user.dir").concat(File.separator).concat("Config.properties");
            in = new FileInputStream(propertyPath);
            Properties p = new Properties();
            p.load(in);
            DRIVER = p.getProperty("DB_DRIVER");
            URL = p.getProperty("DB_CONN_URL");
                            USER = p.getProperty("DB_USER");
                       DBUtil.startPool();
                         }catch(){}....

    private static BasicDataSource ds = null;

    public static void startPool() {
        ds = new BasicDataSource();
        ds.setDriverClassName((String) Configuration.DRIVER);
        ds.setUsername((String) Configuration.USER);
        ds.setPassword((String) Configuration.PASSWORD);
        ds.setUrl((String) Configuration.URL);
                 }
             public static Connection getConnection() throws SQLException{
        return ds.getConnection();
    }
        

    public void a() throws FileNotFoundException, IOException{
        String path = "/config.properties";
        Properties p = new Properties();
        p.setProperty("DB_DRIVER", "");
        p.setProperty("DB_CONN_URL", "");
        p.setProperty("DB_USER", "");
        p.setProperty("DB_PASSWORD", "");
        p.store(new FileOutputStream(path), null);
    }