@Slf4j
public class CenterPayConfig {
    private static Properties conf = null;
    private final static String propertiesFilePath = "/centerpay_v2.properties";

    private static CenterPayConfig instance = new CenterPayConfig();
    public static CenterPayConfig newInstance() {
        return instance;
    }

    private CenterPayConfig() {

    }
    static {
        log.info("开始加载支付中心v2相关配置");
        try {
            conf = new Properties();
            InputStream in = CenterPayConfig.class.getClassLoader().getResourceAsStream(propertiesFilePath);
            conf.load(in);
        }catch(IOException e){
            log.error("加载支付中心v2文件失败",e);
            e.printStackTrace();
        }
    }

}

try {
           String  url= CenterPayConfig.newInstance().getUrl();
            ........
        }
        catch (Exception e){
            logger.error("主动查询异常:{}",paymentCode,e);
            jsonResult=new JsonResult(904,"扫码支付异常,请尝试使用app支付或者公众号支付");
        }

 static {
        log.info("开始加载支付中心v2相关配置");
        try {
            conf = new Properties();
            InputStream in = CenterPayConfig.class.getClassLoader().getResourceAsStream(propertiesFilePath);
            conf.load(in);
        }catch(IOException e){
            log.error("加载支付中心v2文件失败",e);
            e.printStackTrace();
        }catch (Exception e){
            log.error("加载支付中心v2文件异常",e);
            e.printStackTrace();
        }
    }