Spring-Boot 不返回字段为null值

2020-07-16

Spring-Boot 不返回字段为null值

方法一：在application.yml配置文件中

1	spring:
2	jackson:
3	default-property-inclusion: non_null

方法二：单DTO空值过滤，DTO上添加如下注解

1	@JsonInclude(JsonInclude.Include.NON_EMPTY)
2	@JsonInclude(JsonInclude.Include.NON_NULL)

方法三：自定义消息转换器

@Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter{
    /**
     * 利用fastjson替换掉jackson
     * @param converters
     */
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        super.configureMessageConverters(converters);
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
    }
}

方法四: 在xml中配置

<!--开启注解支持，并配置处理器映射器和适配器  -->	
<mvc:annotation-driven conversion-service="converterService_self">
	    <!--jackson处理过的json null值过滤-->
		<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>