字段爲(for)null時(hour)，保存報錯

Field error in object 'xxx' on field 'xxx': rejected value [null];

原因是(yes)數據庫字段内容爲(for)空，從接口獲取json對象值爲(for)null，重新提交時(hour)格式無法轉換爲(for)對應的(of)類型

方法一(one)

@Configuration
public class JacksonConfig {
    @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 {
                jsonGenerator.writeString("");
            }
        });
        return objectMapper;
    }
}

方法二

spring.jackson.default-property-inclusion=NON_NULL

方法三

在(exist)實體類上添加注解

@JsonInclude(JsonInclude.Include.NON_NULL)