/**
 * 對(duì)象轉(zhuǎn)換器 ObjectMapper：基于jackson將Java對(duì)象轉(zhuǎn)為json（序列化），或者將json轉(zhuǎn)為Java對(duì)象（反序列化）
 *
 *          ObjectMapper中固有的序列化器（或反序列化器）可能不能滿足我們的需求
 *      因此需要?jiǎng)?chuàng)建 ObjectMapper 的子類，自定義新的序列化器，例如 Long --> String 的序列化器
 *
 */
public class JacksonObjectMapper extends ObjectMapper {

    public static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd";
    public static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
    public static final String DEFAULT_TIME_FORMAT = "HH:mm:ss";

    public JacksonObjectMapper() {
        super();
        //收到未知屬性時(shí)不報(bào)異常
        this.configure(FAIL_ON_UNKNOWN_PROPERTIES, false);

        //反序列化時(shí)，屬性不存在的兼容處理
        this.getDeserializationConfig().withoutFeatures(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);

        // SimpleModule對(duì)象，添加各種序列化器和反序列化器
        SimpleModule simpleModule = new SimpleModule()
                // 添加反序列化器
                .addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)))
                .addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)))
                .addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)))

                // 添加序列化器
                .addSerializer(BigInteger.class, ToStringSerializer.instance)
                .addSerializer(Long.class, ToStringSerializer.instance)   // 實(shí)現(xiàn) Long --> String 的序列化器
                .addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)))
                .addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)))
                .addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)));

        // 對(duì)自定義的 simpleModule 進(jìn)行注冊(cè)
        this.registerModule(simpleModule);
    }
}

/**
     * 擴(kuò)展 Spring MVC 的消息轉(zhuǎn)換器
     *
     *      將自定義的對(duì)象轉(zhuǎn)換器 JacksonObjectMapper 加入到 SpringMVC 的消息轉(zhuǎn)換器隊(duì)列中
     *
     * @param converters
     */
    @Override
    protected void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        log.info("擴(kuò)展消息轉(zhuǎn)換器......");

        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();

        messageConverter.setObjectMapper(new JacksonObjectMapper());

        converters.add(0, messageConverter);

    }