网站后台这么做视频教程,2016网站设计规范,网站的空间是,中国价格信息网接口返回的json中有的字段可能是为空的#xff0c;我们不希望他为空的还返回#xff0c;如下例子#xff1a; 解决方案#xff1a;只需要加一个配置类就行#xff1a;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.Dese…接口返回的json中有的字段可能是为空的我们不希望他为空的还返回如下例子 解决方案只需要加一个配置类就行
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;import java.nio.charset.StandardCharsets;
import java.util.List;/*** author 咕噜科* ClassName: JsonRespConfiguration* date: 2023-08-20 19:28* Description: 用于配置 JSON 数据的序列化和反序列化。* version 1.0*/
Configuration
public class JsonRespConfiguration implements WebMvcConfigurer {Overridepublic void configureMessageConverters(ListHttpMessageConverter? converters) {converters.add(mappingJackson2HttpMessageConverter());}Beanpublic MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter(){// 通过该方法对mapper对象进行设置所有序列化的对象都将按改规则进行系列化MappingJackson2HttpMessageConverter converter new MappingJackson2HttpMessageConverter();ObjectMapper objectMapper new ObjectMapper();//允许有未知字段映射不上objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);//过滤response的空值// Include.Include.ALWAYS 默认// Include.NON_DEFAULT 属性为默认值不序列化// Include.NON_EMPTY 属性为 空 或者为 NULL 都不序列化则返回的json是没有这个字段的。// Include.NON_NULL 属性为NULL 不序列化,就是为null的字段不参加序列化objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);converter.setDefaultCharset(StandardCharsets.UTF_8);converter.setObjectMapper(objectMapper);return converter;}
}
重新启动后再看结果null值的字段已经没返回了
