@JsonInclude(Include.NON_NULL)全局配置

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非全局配置：

 

全局配置：

1、springMVC.xml

<!-- 默认的注解映射的支持 比如requestMapper之类的 -->
<mvc:annotation-driven>
<mvc:message-converters>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="objectMapper">
<bean class="com.fasterxml.jackson.databind.ObjectMapper">
<property name="serializationInclusion"> 
<value type="com.fasterxml.jackson.annotation.JsonInclude.Include">NON_NULL</value> 
</property>
</bean>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>

2、spring boot 的配置

配置文件加上：

spring.jackson.default-property-inclusion=non_null

or  

如果配置不生效，则检查 @EnableWebMvc注释掉

或者：

@Configuration
@EnableWebMvc
@Slf4j
public class WebMvcConfig extends WebMvcConfigurerAdapter {
   
    //@JsonInclude(Include.NON_NULL)全局配置
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters){
        Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder()
                .serializationInclusion(JsonInclude.Include.NON_NULL);
        converters.add(new MappingJackson2HttpMessageConverter(builder.build()));
    }
}