springboot 将null字段输出为空串

最新推荐文章于 2025-06-11 17:36:03 发布

原创最新推荐文章于 2025-06-11 17:36:03 发布 · 3.8k 阅读

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本文介绍如何配置Spring Boot应用中的Jackson JSON处理器来处理null字段，使其序列化为空字符串，并展示了如何定制序列化行为，包括忽略null值、启用驼峰转下划线等。

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null字段输出为空串

 @Bean
    @Primary
    @ConditionalOnMissingBean(ObjectMapper.class)
    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        objectMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() {
            @Override
            public void serialize(Object o, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
                jsonGenerator.writeString("");
            }
        });
        return objectMapper;
    }

json转换配置

@Bean
    public Jackson2ObjectMapperBuilderCustomizer customJackson() {
        return new Jackson2ObjectMapperBuilderCustomizer() {
            @Override
            public void customize(Jackson2ObjectMapperBuilder jacksonObjectMapperBuilder) {                jacksonObjectMapperBuilder.serializationInclusion(JsonInclude.Include.NON_NULL);               jacksonObjectMapperBuilder.failOnUnknownProperties(false);                jacksonObjectMapperBuilder.propertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);             jacksonObjectMapperBuilder.configure(jacksonObjectMapper(jacksonObjectMapperBuilder));
            }
        };
    }