fastjson对象转json时去掉某一些属性

GetTravelParam对象：

@Data
public class GetTravelParam  implements Serializable {


    private static final long serialVersionUID = 1L;
    private String endTime;
    private String formCode;
    private String startTime;
    /**
     * 0 否 1 是
     */
    private String isMgtFlag;
}

对象转json串后不包含isMgtFlag

GetTravelParam param = new GetTravelParam();
SimplePropertyPreFilter filter = new SimplePropertyPreFilter();
filter.getExcludes().add("isMgtFlag");
String jsonStr = JSONObject.toJSONString(param,filter);

此时jsonStr中不再包含isMgtFlag