SpringBoot+MyBatisPlus对Map中Date格式转换处理的方法详解

SomePO po = new SomePO();
//...
Map<String, Object> map = new HashMap<>();
map.put("k1", new Date());
po.setProperties(map);
//...
mapper.insert(po);
//...
SomePO dummy = mapper.select(po.id);
// 这里的k1已经变成了 Long 类型
Object k1 = dummy.getProperties().get("k1");

public class ObjectMapper extends ObjectCodec implements Versioned, Serializable {
    //...
    protected SerializationConfig _serializationConfig;
    protected DeserializationConfig _deserializationConfig;
    //...

    public ObjectMapper setDateFormat(DateFormat dateFormat) {
        this._deserializationConfig = (DeserializationConfig)this._deserializationConfig.with(dateFormat);
        this._serializationConfig = this._serializationConfig.with(dateFormat);
        return this;
    }

    public DateFormat getDateFormat() {
        return this._serializationConfig.getDateFormat();
    }
}

public SerializationConfig with(DateFormat df) {
	SerializationConfig cfg = (SerializationConfig)super.with(df);
	return df == null ? cfg.with(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS) : cfg.without(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
}

public final void defaultSerializeDateValue(long timestamp, JsonGenerator gen) throws IOException {
	if (this.isEnabled(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)) {
		gen.writeNumber(timestamp);
	} else {
		gen.writeString(this._dateFormat().format(new Date(timestamp)));
	}
}

public final void defaultSerializeDateValue(Date date, JsonGenerator gen) throws IOException {
	if (this.isEnabled(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)) {
		gen.writeNumber(date.getTime());
	} else {
		gen.writeString(this._dateFormat().format(date));
	}
}

public class Event {
    public String name;

    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "dd-MM-yyyy hh:mm:ss")
    public Date eventDate;
}

public class CustomDateSerializer extends StdSerializer<Date> {
    //...
}

public class Event {
    public String name;

    @JsonSerialize(using = CustomDateSerializer.class)
    public Date eventDate;
}

private static ObjectMapper createObjectMapper() {
	ObjectMapper objectMapper = new ObjectMapper();
	SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	objectMapper.setDateFormat(df);
	return objectMapper;
}

spring:
  ...
  jackson:
    date-format: yyyy-MM-dd HH:mm:ss

spring:
  ...
  jackson:
    date-format: yyyy-MM-dd HH:mm:ss

public class JacksonUtil {
    private static final Logger log = LoggerFactory.getLogger(JacksonUtil.class);
    private static final ObjectMapper MAPPER = createObjectMapper();
    private JacksonUtil() {}

    private static ObjectMapper createObjectMapper() {
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(JsonGenerator.Feature.AUTO_CLOSE_TARGET, false);
        objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        objectMapper.setDateFormat(df);
        return objectMapper;
    }

    public static ObjectMapper getObjectMapper() {
        return MAPPER;
    }
}

@Configuration
@MapperScan(basePackages = {"com.somewhere.commons.impl.mapper"})
public class MybatisPlusConfig {

    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.POSTGRE_SQL));
        interceptor.addInnerInterceptor(new OptimisticLockerInnerInterceptor());
        return interceptor;
    }

    @PostConstruct
    public void changeObjectMapper() {
        // This will unify the date format with util methods
        JacksonTypeHandler.setObjectMapper(JacksonUtil.getObjectMapper());
    }
}