Mybatis-plus 空值不返回问题

最近springBoot项目mybatis获取字段为null时候返回前端不显示,这不是我想要的结果。我想要结果无论null还是空字段串都给前端返回字段。

@Configuration
@EnableWebMvc
public class GlobalResourceConfig implements WebMvcConfigurer {
//两种方法参考
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        //定义一个convert转换消息的对象
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
        //添加fastjson的配置信息
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setCharset(StandardCharsets.UTF_8);
        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat,SerializerFeature.WriteMapNullValue);//主要看这行代码
        //处理日期时间格式化问题
        fastJsonConfig.setDateFormat("yyyy-MM-dd hh:mm:ss");
        //处理中文乱码问题
        List<MediaType> fastMediaTypes = new ArrayList<>();
        fastMediaTypes.add(MediaType.APPLICATION_JSON);
        //在convert中添加配置信息.
        fastConverter.setSupportedMediaTypes(fastMediaTypes);
        StringHttpMessageConverter stringHttpMessageConverter = new StringHttpMessageConverter();
        stringHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes);
        converters.add(stringHttpMessageConverter);
        fastConverter.setFastJsonConfig(fastJsonConfig);
        //将convert添加到converters中
        converters.add(fastConverter);
    }
//两种方法参考

/**
     * 使用阿里 FastJson 作为JSON MessageConverter
     */
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
        FastJsonConfig config = new FastJsonConfig();
        //保留空的字段
        config.setCharset(StandardCharsets.UTF_8);
        config.setSerializerFeatures(SerializerFeature.WriteMapNullValue,SerializerFeature.WriteDateUseDateFormat,SerializerFeature.PrettyFormat,SerializerFeature.WriteMapNullValue);
//SerializerFeature.PrettyFormat 这是格式化返回前端
//SerializerFeature.WriteMapNullValue 这是mybatis-plus 查询到以后不管有没有值都返回给前端

//        SerializerFeature.WriteNullStringAsEmpty,//String null -> "" 这是String类型如果为null则返回""
//        SerializerFeature.WriteNullNumberAsZero//Number null -> 0这是Number类型如果为null则返回0

// 格式化输出
//SerializerFeature.PrettyFormat,
// 消除循环引用
//SerializerFeature.DisableCircularReferenceDetect,
// 返回结果保留null值
//SerializerFeature.WriteMapNullValue,
// 将返回值为null的字符串转变成"",在这里可以自己设置
//SerializerFeature.WriteNullStringAsEmpty,
// List字段如果为null,输出为[],而非null
//SerializerFeature.WriteNullListAsEmpty

        // 按需配置，更多参考FastJson文档哈
        MediaType[] mediaTypes = new MediaType[]{
                MediaType.APPLICATION_OCTET_STREAM,
                MediaType.APPLICATION_JSON,
                MediaType.TEXT_HTML,
                MediaType.TEXT_PLAIN,
                MediaType.TEXT_XML,
                MediaType.APPLICATION_STREAM_JSON,
                MediaType.APPLICATION_ATOM_XML,
                MediaType.APPLICATION_FORM_URLENCODED,
                MediaType.APPLICATION_PDF,
        };
        converter.setSupportedMediaTypes(Arrays.asList(mediaTypes));
        converter.setFastJsonConfig(config);
        converter.setDefaultCharset(StandardCharsets.UTF_8);
//        converter.setSupportedMediaTypes(Collections.singletonList(MediaType.APPLICATION_JSON_UTF8));
        converters.add(new ByteArrayHttpMessageConverter());
        converters.add(converter);
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
        registry.addResourceHandler("/script/**").addResourceLocations("classpath:/script/");
        registry.addResourceHandler("swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/");
        registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
    }

}