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Fastjson is a JSON processor (JSON parser + JSON generator) written in Java

There is a newer version: 2.0.53.android8

package com.alibaba.fastjson2.writer;

import com.alibaba.fastjson2.JSONException;
import com.alibaba.fastjson2.JSONWriter;
import com.alibaba.fastjson2.util.JDKUtils;

import java.lang.reflect.Field;

final class FieldWriterMillisField
        extends FieldWriterDate {
    FieldWriterMillisField(String fieldName,
            int ordinal,
            long features,
            String dateTimeFormat,
            String label,
            Field field
    ) {
        super(fieldName, ordinal, features, dateTimeFormat, label, long.class, long.class, field, null);
    }

    @Override
    public Object getFieldValue(T object) {
        return getFieldLong(object);
    }

    public long getFieldLong(T object) {
        if (object == null) {
            throw new JSONException("field.get error, " + fieldName);
        }

        try {
            long value;
            if (fieldOffset != -1) {
                value = JDKUtils.UNSAFE.getLong(object, fieldOffset);
            } else {
                value = field.getLong(object);
            }
            return value;
        } catch (IllegalArgumentException | IllegalAccessException e) {
            throw new JSONException("field.get error, " + fieldName, e);
        }
    }

    @Override
    public boolean write(JSONWriter jsonWriter, T object) {
        long millis = getFieldLong(object);
        writeDate(jsonWriter, millis);
        return true;
    }

    @Override
    public void writeValue(JSONWriter jsonWriter, T object) {
        long millis = getFieldLong(object);
        writeDate(jsonWriter, false, millis);
    }
}