Java controller接口出入参时间序列化转换操作方法(两种)

    @JsonFormat(timezone = "GMT+8", pattern = "yyyy-MM-dd HH:mm:ss")
    private LocalDateTime createTime2;
    @JsonFormat(timezone = "GMT+8", pattern = "yyyy-MM-dd HH:mm:ss")
    private Date createTime3;

package com.zhh.demo.config;
import cn.hutool.core.date.LocalDateTimeUtil;
import cn.hutool.core.util.NumberUtil;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import org.apache.commons.lang3.StringUtils;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.io.IOException;
import java.math.BigInteger;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
@Configuration
// 表示通过aop框架暴露该代理对象,AopContext能够访问
//@EnableAspectJAutoProxy(exposeProxy = true)
public class ApplicationConfig {
    /** 年-月-日 时:分:秒 */
    private static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
    /**
     * 序列化 时间格式转换类型
     * timestamp:时间戳
     * dateString: 时间字符串格式
     * */
    private static final String LOCAL_DATE_TIME_SERIALIZER_TYPE = "dateString";
    /**
     * description:适配自定义序列化和反序列化策略
     */
    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
        return builder -> {
            // 时间的序列化和反序列化
            builder.serializerByType(LocalDateTime.class, new LocalDateTimeSerializer());
            builder.deserializerByType(LocalDateTime.class, new LocalDateTimeDeserializer());
            // 将long类型数据转化为string给前端 避免前端造成的精度丢失
            builder.serializerByType(Long.class, ToStringSerializer.instance);
            builder.serializerByType(BigInteger.class, ToStringSerializer.instance);
        };
    }
    /**
     * description:序列化
     * LocalDateTime序列化为毫秒级时间戳
     */
    public static class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {
        @Override
        public void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider serializers)
                throws IOException {
            if (value != null) {
                // 通过配置决定把时间转换成 时间戳 或 时间字符串
                if ("timestamp".equals(LOCAL_DATE_TIME_SERIALIZER_TYPE)) {
                    // 13位时间戳
                    gen.writeNumber(LocalDateTimeUtil.toEpochMilli(value));
                } else {
                    // 指定格式的时间字符串
                    gen.writeString(value.format(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)));
                }
            }
        }
    }
    /**
     * description:反序列化
     * 毫秒级时间戳序列化为LocalDateTime
     */
    public static class LocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
        @Override
        public LocalDateTime deserialize(JsonParser p, DeserializationContext deserializationContext)
                throws IOException {
            //2023年11月2日: 尝试反序列增加更多的支持, 支持long输入, 支持字符串输入
            if (p == null) {
                return null;
            }
            String source = p.getText();
            return parse(source);
        }
    }
    /**
     * 时间戳字符串或格式化时间字符串转换为 LocalDateTime
     * 例：1745806578000、2025-04-28 10:16:18
     * @param source    13位时间戳 或格式化时间字符串
     * @return
     */
    private static LocalDateTime parse(String source) {
        // 如果是时间戳
        if (NumberUtil.isLong(source)) {
            long timestamp = Long.parseLong(source);
            if (timestamp > 0) {
                return LocalDateTimeUtil.of(timestamp, ZoneOffset.of("+8"));
            } else {
                return null;
            }
            // 如果是格式化时间字符串
        } else {
            if (StringUtils.isBlank(source)) {
                return null;
            }
            // 尝试判断能否解析
            if (canParseByDateTimeFormatter(source, DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT))) {
                return LocalDateTime.parse(source, DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT));
            }
            return null;
        }
    }
    /**
     * 判断是否能解析格式化时间字符串
     * @param source    格式化时间字符串（格式 2025-04-28 10:16:18）
     * @param dateTimeFormatter 格式 yyyy-MM-dd HH:mm:ss
     * @return
     */
    private static boolean canParseByDateTimeFormatter(String source, DateTimeFormatter dateTimeFormatter) {
        try {
            dateTimeFormatter.parse(source);
        } catch (DateTimeParseException e) {
            return false;
        }
        return true;
    }
}

@Data
public class UserRO {
    private LocalDateTime createTime1;
    private LocalDateTime createTime2;
    @JsonFormat(timezone = "GMT+8", pattern = "yyyy-MM-dd HH:mm:ss")
    private Date createTime3;
}

   @ApiOperation("时间测试")
    @PostMapping("/time")
    public UserRO show(@RequestBody UserRO userRO){
        System.out.println("\n接收到的入参：");
        System.out.println(userRO.getCreateTime1());
        System.out.println(userRO.getCreateTime2());
        System.out.println(userRO.getCreateTime3());
        System.out.println("\n出参：");
        LocalDateTime newTime = LocalDateTime.now();
        UserRO user = new UserRO();
        user.setCreateTime1(newTime);
        user.setCreateTime2(newTime);
        user.setCreateTime3(new Date());
        System.out.println(user.getCreateTime1());
        System.out.println(user.getCreateTime2());
        System.out.println(user.getCreateTime3());
        System.out.println("\n");
        return user;
    }