@JsonInclude(JsonInclude.Include.NON_NULL) 不生效问题，不返还null给前端

文章参考：点击调整

项目中使用的是：fastJson进行序列化，然后就是，返回给前端多余字段

直接使用，是不生效的。

@JsonInclude(JsonInclude.Include.NON_NULL)

实现WebMvcConfigurationSupport

 
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
 
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
 

@Configuration
public class FastJsonConfiguration extends WebMvcConfigurationSupport {
 
    /**
     * 使用阿里 fastjson 作为JSON MessageConverter
     * @param converters
     */
   @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        Iterator<HttpMessageConverter<?>> iterator = converters.iterator();
        while(iterator.hasNext()){
            HttpMessageConverter<?> converter = iterator.next();
            if(converter instanceof MappingJackson2HttpMessageConverter){
                iterator.remove();
            }
        }
        //创建fastJson消息转换器
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
        //升级最新版本需加=============================================================
        List<MediaType> supportedMediaTypes = new ArrayList<>();
        supportedMediaTypes.add(MediaType.APPLICATION_JSON);
        supportedMediaTypes.add(MediaType.APPLICATION_ATOM_XML);
        supportedMediaTypes.add(MediaType.APPLICATION_FORM_URLENCODED);
        supportedMediaTypes.add(MediaType.APPLICATION_OCTET_STREAM);
        supportedMediaTypes.add(MediaType.APPLICATION_PDF);
        supportedMediaTypes.add(MediaType.APPLICATION_RSS_XML);
        supportedMediaTypes.add(MediaType.APPLICATION_XHTML_XML);
        supportedMediaTypes.add(MediaType.APPLICATION_XML);
        supportedMediaTypes.add(MediaType.IMAGE_GIF);
        supportedMediaTypes.add(MediaType.IMAGE_JPEG);
        supportedMediaTypes.add(MediaType.IMAGE_PNG);
        supportedMediaTypes.add(MediaType.TEXT_EVENT_STREAM);
        supportedMediaTypes.add(MediaType.TEXT_HTML);
        supportedMediaTypes.add(MediaType.TEXT_MARKDOWN);
        supportedMediaTypes.add(MediaType.TEXT_PLAIN);
        supportedMediaTypes.add(MediaType.TEXT_XML);
        fastConverter.setSupportedMediaTypes(supportedMediaTypes);
        //创建配置类
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        //修改配置返回内容的过滤
        //WriteNullListAsEmpty  ：List字段如果为null,输出为[],而非null
        //WriteNullStringAsEmpty ： 字符类型字段如果为null,输出为"",而非null
        //DisableCircularReferenceDetect ：消除对同一对象循环引用的问题，默认为false（如果不配置有可能会进入死循环）
        //WriteNullBooleanAsFalse：Boolean字段如果为null,输出为false,而非null
        //WriteMapNullValue：是否输出值为null的字段,默认为false
        fastJsonConfig.setSerializerFeatures(
                SerializerFeature.QuoteFieldNames,
                SerializerFeature.DisableCircularReferenceDetect,
                SerializerFeature.WriteEnumUsingToString,
//                SerializerFeature.WriteMapNullValue,
                SerializerFeature.WriteDateUseDateFormat
        );
        fastConverter.setFastJsonConfig(fastJsonConfig);
        //将fastjson添加到视图消息转换器列表内
        converters.add(fastConverter);
    }
 
//    /**
//     * 整合了swagger需要配置swagger拦截
//     * @param registry
//     */
//    @Override
//    public void addResourceHandlers(ResourceHandlerRegistry registry) {
//        registry.addResourceHandler("swagger-ui.html","index.html").addResourceLocations("classpath:/META-INF/resources/");
//        registry.addResourceHandler("doc.html").addResourceLocations("classpath:/META-INF/resources/");
//        registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
//        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/META-INF/resources/static/");
//    }
//
//
//    @Override
//    public void addCorsMappings(CorsRegistry registry) {
//        registry.addMapping("/**")
//                .allowedOrigins("*")
//                .allowCredentials(true)
//                .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS")
//                .maxAge(3600);
//    }
 
}

效果图