筛选出snakeyaml中的空字段

这是密码

Representer representer = new Representer() {
    @Override
    protected NodeTuple representJavaBeanProperty(Object javaBean, Property property, Object propertyValue,Tag customTag) {
        // if value of property is null, ignore it.
        if (propertyValue == null) {
            return null;
        }  
        else {
            return super.representJavaBeanProperty(javaBean, property, propertyValue, customTag);
        }
    }
};

在YAML对象中使用此表示器。