RequestId生成工具类，兼顾可读性和随机性

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

public class RequestIdGenerator {

    public static String generateRequestId() {
        StringBuilder requestId = new StringBuilder();

        // 添加日期部分（年月日）
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");
        requestId.append(dateFormat.format(new Date()));

        // 添加时间部分（小时分钟秒）
        SimpleDateFormat timeFormat = new SimpleDateFormat("HHmmss");
        requestId.append(timeFormat.format(new Date()));

        // 添加一串随机数字
        Random random = new Random();
        for (int i = 0; i < 6; i++) {
            requestId.append(random.nextInt(10));
        }

        // 添加一个随机字母
        requestId.append((char) ('A' + random.nextInt(26)));

        // 添加一串随机字母和数字
        String chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        for (int i = 0; i < 16; i++) {
            requestId.append(chars.charAt(random.nextInt(chars.length())));
        }

        return requestId.toString();
    }

    public static void main(String[] args) {
        // 示例：打印两个requestId
        System.out.println(generateRequestId());
        System.out.println(generateRequestId());
    }
}