public static String getMd5(String url, String type) {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        final long MAX_BPS = 2 * 1024 * 1024; // 200Mbps = 25MB/s
        MessageDigest md;
        // 創(chuàng)建時間格式化器（線程安全）
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");
        try {
            md = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("MD5 algorithm not found", e);
        }
        try (CloseableHttpResponse response = httpClient.execute(new HttpGet(url))) {
            HttpEntity entity = response.getEntity();
            if (entity == null) {
                return "";
            }
            // 記錄開始時間
            long startTime = System.currentTimeMillis();
            try (InputStream in = entity.getContent()) {
                byte[] buffer = new byte[8192];
                int bytesRead;
                long totalBytes = 0;
                while ((bytesRead = in.read(buffer)) != -1) {
                    md.update(buffer, 0, bytesRead);
                    totalBytes += bytesRead;
                    // 動態(tài)限速邏輯
                    long elapsed = System.currentTimeMillis() - startTime;
                    long expectedTime = (totalBytes * 1000) / MAX_BPS;
                    if (elapsed < expectedTime) {
                        Thread.sleep(expectedTime - elapsed);
                    }
                }
                // 計算最終統(tǒng)計信息
                long endTime = System.currentTimeMillis();
                double timeCost = DoubleUtils.formatDouble((endTime - startTime) / 1000.0);
                String sizeMB = String.format("%.3f", DoubleUtils.formatDouble(totalBytes / (1024.0 * 1024)));
                // 生成MD5
                String md5 = DatatypeConverter.printHexBinary(md.digest()).toLowerCase();
                // 完整日志輸出
                log.info("下載完成 | 類型: {} | MD5: {} | 大小: {}MB | 耗時: {}s",
                        type, md5, sizeMB, timeCost);
                return md5;
            }
        } catch (Exception e) {
            // 記錄異常發(fā)生時間
            String errorTime = LocalDateTime.now().format(formatter);
            log.error("下載失敗 | 類型: {} | 錯誤時間: {} | 原因: {}",
                    type, errorTime, e.getMessage());
            return "";
        }finally {
            try {
                httpClient.close();
            }catch (Exception e) {
            }
        }
    }