/**
 * 〈返回json空值去掉null和""〉 〈功能詳細描述〉
 * 
 * @author gogym
 * @version 2017年10月13日
 * @see JacksonConfig
 * @since
 */
@Configuration
public class JacksonConfig
{
  @Bean
  @Primary
  @ConditionalOnMissingBean(ObjectMapper.class)
  public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder)
  {
    ObjectMapper objectMapper = builder.createXmlMapper(false).build();
 
    // 通過該方法對mapper對象進行設置，所有序列化的對象都將按改規(guī)則進行系列化
    // Include.Include.ALWAYS 默認
    // Include.NON_DEFAULT 屬性為默認值不序列化
    // Include.NON_EMPTY 屬性為 空（""） 或者為 NULL 都不序列化，則返回的json是沒有這個字段的。這樣對移動端會更省流量
    // Include.NON_NULL 屬性為NULL 不序列化,就是為null的字段不參加序列化
    //objectMapper.setSerializationInclusion(Include.NON_EMPTY);
 
    // 字段保留，將null值轉(zhuǎn)為""
    objectMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>()
  {
    @Override
    public void serialize(Object o, JsonGenerator jsonGenerator,
               SerializerProvider serializerProvider)
        throws IOException, JsonProcessingException
    {
      jsonGenerator.writeString("");
    }
  });
    return objectMapper;
  }
}

  <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.22</version>
    </dependency>

package com.message.config;
 
/**
 * @author :zoboy
 * @Description:
 * @ Date: Created in 2019-11-18 10:29
 */
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
 
import java.util.ArrayList;
import java.util.List;
 
@Configuration
public class ResultConfig {
 
  /*注入Bean : HttpMessageConverters，以支持fastjson*/
  @Bean
  public HttpMessageConverters fastJsonHttpMessageConverters() {
    FastJsonHttpMessageConverter fastConvert = new FastJsonHttpMessageConverter();
    FastJsonConfig fastJsonConfig = new FastJsonConfig();
    fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat,
        SerializerFeature.WriteNullStringAsEmpty,
        SerializerFeature.WriteNullNumberAsZero,
        SerializerFeature.WriteNullListAsEmpty,
        SerializerFeature.WriteMapNullValue,
        SerializerFeature.DisableCheckSpecialChar);
    fastJsonConfig.setDateFormat("yyyy-MM-dd hh:mm:ss");
    //處理中文亂碼問題
    List<MediaType> fastMediaTypes = new ArrayList<>();
    fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
    fastConvert.setSupportedMediaTypes(fastMediaTypes);
    fastConvert.setFastJsonConfig(fastJsonConfig);
    return new HttpMessageConverters((HttpMessageConverter<?>) fastConvert);
  }
}

{
 "code": "0",
 "message": "成功！",
 "data": null
}