@Override
    public PayOutMessage build() {
        PayJsonOutMessage message = new PayJsonOutMessage();
        setCommon(message);
        message.setContent(json.toJSONString());
        return message;
    }
@author egan
 <pre>
     email egzosn@gmail.com
     date 2017/1/13 14:30
  </pre>
pay-java-common/src/main/java/com/egzosn/pay/common/bean/outbuilder/JsonBuilder.java