使用json将java.time.Duration序列化为仅毫秒

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.time.Duration;

public class DurationSerializationExample {
    public static void main(String[] args) {
        Duration duration = Duration.ofSeconds(30); // 假设有一个 30 秒的 Duration 对象

        long milliseconds = duration.toMillis(); // 将 Duration 转换为毫秒数

        // 将毫秒数序列化为 JSON 字符串
        String jsonString = serializeToJson(milliseconds);

        System.out.println(jsonString); // 输出 JSON 字符串
    }

    private static String serializeToJson(long milliseconds) {
        ObjectMapper mapper = new ObjectMapper();
        String jsonString = "";

        try {
            jsonString = mapper.writeValueAsString(milliseconds);
        } catch (JsonProcessingException e) {
            e.printStackTrace();
        }

        return jsonString;
    }
}