public JsonBuilder content(String key, Object content) {
        this.json.put(key, content);
        return this;
    }
@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