json Date格式化时间偏差8小时，而@JsonFormat注解有无法动态指定时区，如何解决？

原创已于 2024-09-21 07:12:23 修改 · 519 阅读

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#json #python #开发语言

于 2024-09-20 06:13:19 首次发布

use this method to set timezone and replace @JsonFormat(pattern = “yyyy-MM-dd HH:mm:ss”, timezone=“GMT+8”)

(1)Model field

    @JSONField(format = DateTimeJsonFormatSerializer.TIME_FMT)//fastjson,JSON.toJSONString()
    @JsonSerialize(using = DateTimeJsonFormatSerializer.class)//jackson,影响http request
    @JsonDeserialize(using = DateTimeJsonFormatDeserializer.class)//jackson,影响http response
    private Date deliverTime;

(2) DateTimeJsonFormatSerializer.java


import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

@Slf4j
public class DateTimeJsonFormatSerializer extends JsonSerializer<Date> {
    public static final String TIME_FMT="yyyy-MM-dd HH:mm:ss";
    protected static ThreadLocal<SimpleDateFormat> THREAD_LOCAL = new ThreadLocal<SimpleDateFormat>() {
        @Override
        protected SimpleDateFormat initialValue() {
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat(TIME_FMT);
            TimeZone timeZone = TimeZone.getDefault();
            //        TimeZone timeZone = TimeZone.getTimeZone("Asia/Shanghai");
            simpleDateFormat.setTimeZone(timeZone);
            return simpleDateFormat;
        }
    };

    public DateTimeJsonFormatSerializer() {
        log.info("DateTimeJsonFormatSerializer default timezone:" + TimeZone.getDefault().getID());
    }

    @Override
    public void serialize(Date date, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
        jsonGenerator.writeString(THREAD_LOCAL.get().format(date));
    }
}

(3)DateTimeJsonFormatDeserializer.java

import com.fasterxml.jackson.core.JacksonException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
import java.text.ParseException;
import java.util.Date;
import java.util.TimeZone;

@Slf4j
public class DateTimeJsonFormatDeserializer extends JsonDeserializer<Date> {
    public DateTimeJsonFormatDeserializer() {
        log.info("DateTimeJsonFormatDeserializer default timezone:" + TimeZone.getDefault().getID());
    }

    @Override
    public Date deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JacksonException {
        try {
            return DateTimeJsonFormatSerializer.THREAD_LOCAL.get().parse(p.getText());
        } catch (ParseException e) {
            throw new RuntimeException(e);
        }
    }
}

参考：
https://www.iditect.com/program-example/java--set-current-timezone-to-jsonformat-timezone-value.html
https://cloud.tencent.com/developer/article/2063631