解决SpringBoot返回结果如果为null或空值不显示处理问题

@Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter{
    //    /**
//     * 利用fastjson替换掉jackson
//     * @param converters
//     */
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        super.configureMessageConverters(converters);
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(
                SerializerFeature.PrettyFormat
        );
    }
}

spring:
  jackson:
    default-property-inclusion: non_null

@JsonIgnoreProperties(ignoreUnknown = true)   //忽略传参时其他无用字段
@JsonInclude(JsonInclude.Include.NON_NULL)   // 忽略反参时值为null的字段
public class BaseAreaBO implements Serializable {
    @ApiModelProperty(value = "地区code")
    private String areaCode;
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