springboot中LocalDateTime,LocalDate,LocalTime 序列化,反序列化,格式处理

对json 处理的工具类

public class JsonUtils {

    private final static ObjectMapper objectMapper = getMapper();

    /**
     * 获取初始化ObjectMapper
     *
     * @return
     */
    public static ObjectMapper getMapper() {
        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.CHINA));
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(Constants.DEFAULT_DATE_TIME_FORMAT)));
        javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern(Constants.DEFAULT_DATE_FORMAT)));
        javaTimeModule.addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern(Constants.DEFAULT_TIME_FORMAT)));
        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(Constants.DEFAULT_DATE_TIME_FORMAT)));
        javaTimeModule.addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern(Constants.DEFAULT_DATE_FORMAT)));
        javaTimeModule.addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern(Constants.DEFAULT_TIME_FORMAT)));
        mapper.registerModule(javaTimeModule).registerModule(new ParameterNamesModule());
        return mapper;
    }

    /**
     * 对象序列化
     *
     * @param obj
     * @return
     * @throws Exception
     */
    public static String serialize(Object obj) {
        if (obj == null) return null;
        try {
            return objectMapper.writeValueAsString(obj);
        } catch (JsonProcessingException e) {
            return null;
        }
    }

    /**
     * 对象反序列化
     *
     * @param json
     * @param clazz
     * @param <T>
     * @throws Exception
     */
    public static <T> T deserialize(String json, Class<T> clazz) {
        if (StringUtils.isEmpty(json)) return null;
        if (clazz == null) return null;
        try {
            return objectMapper.readValue(json, clazz);
        } catch (IOException e) {
            return null;
        }
    }

}

　　

SpringBoot 全局配置

@Configuration
public class JacksonCustomizerConfig {

    @Value("${spring.jackson.date-format}")
    private String localDateTimePattern;

    @Value("${spring.jackson.local-date-format}")
    private String localDatePattern;

    @Value("${spring.jackson.local-time-format}")
    private String localTimePattern;

    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
        return builder -> {
            builder.serializerByType(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(localDateTimePattern)));
            builder.serializerByType(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern(localDatePattern)));
            builder.serializerByType(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern(localTimePattern)));
            builder.deserializerByType(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(localDateTimePattern)));
            builder.deserializerByType(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern(localDatePattern)));
            builder.deserializerByType(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern(localTimePattern)));
        };
    }

}

　　

2. 使用字段注解解决,可以搭配使用

    @JsonSerialize(using = LocalDateTimeSerializer.class)
    @JsonDeserialize(using = LocalDateTimeDeserializer.class)
    @JsonFormat(pattern = "yyyy-MM-dd")
    private LocalDateTime ldt;