字段為null時，保存報錯

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

原因是數(shù)據(jù)庫字段內(nèi)容為空，從接口獲取json對象值為null，重新提交時格式無法轉(zhuǎn)換為對應(yīng)的類型

方法一

@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

在實體類上添加注解

@JsonInclude(JsonInclude.Include.NON_NULL)