儿童在学校的相似，是强制的结果。一旦毕业，强制随即结束。——爱尔维修
我们在使用jackson时，如果项目还包含kotlin，则会有警告
此时需要引入依赖
<dependency> <groupId>com.fasterxml.jackson.module</groupId> <artifactId>jackson-module-kotlin</artifactId> <version>2.11.3</version> </dependency>
并添加module
import com.fasterxml.jackson.module.kotlin.KotlinModule; /** * web配置类 * * @author <achao1441470436@gmail.com> * @since 2021/5/18 0018 14:52 */ @Configuration @EnableWebMvc public class WebConfig implements WebMvcConfigurer { /** * @param converters 转换器 * @author <achao1441470436@gmail.com> * @since 2021/5/21 0021 15:08 */ @Override public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter(); ObjectMapper objectMapper = new ObjectMapper(); // 添加kotlin模块 objectMapper.registerModule(new KotlinModule()); objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+8")); SimpleModule simpleModule = new SimpleModule(); simpleModule.addSerializer(Long.class, ToStringSerializer.instance); simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance); objectMapper.registerModule(simpleModule); JavaTimeModule module = new JavaTimeModule(); module.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DatePattern.NORM_DATETIME_PATTERN))); module.addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern(DatePattern.NORM_DATE_PATTERN))); module.addSerializer(new LocalDateSerializer(DateTimeFormatter.ofPattern(DatePattern.NORM_DATE_PATTERN))); module.addSerializer(new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DatePattern.NORM_DATETIME_PATTERN))); objectMapper.setDateFormat(new SimpleDateFormat(DatePattern.NORM_DATETIME_PATTERN)); objectMapper.registerModule(module); objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false); objectMapper.configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true); jackson2HttpMessageConverter.setObjectMapper(objectMapper); converters.add(jackson2HttpMessageConverter); } }
