Java中通过URL检测音频是否为流媒体的教程

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Map;

public class AudioStreamDetector {

    /**
     * 通过HTTP HEAD请求检测音频URL的Content-Type。
     * @param audioUrlStr 音频URL字符串
     * @return Content-Type字符串，如果无法获取则返回null
     */
    public static String getAudioContentType(String audioUrlStr) {
        HttpURLConnection connection = null;
        try {
            URL url = new URL(audioUrlStr);
            connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("HEAD"); // 设置请求方法为HEAD
            connection.setConnectTimeout(5000); // 设置连接超时时间
            connection.setReadTimeout(5000);    // 设置读取超时时间
            connection.setInstanceFollowRedirects(true); // 允许自动重定向

            // 发送请求并获取响应码
            int responseCode = connection.getResponseCode();

            if (responseCode == HttpURLConnection.HTTP_OK) {
                // 获取Content-Type头部
                String contentType = connection.getHeaderField("Content-Type");
                System.out.println("URL: " + audioUrlStr + ", Content-Type: " + contentType);
                return contentType;
            } else {
                System.err.println("Failed to get Content-Type for " + audioUrlStr + 
                                   ". Response Code: " + responseCode);
                return null;
            }
        } catch (IOException e) {
            System.err.println("Error connecting to " + audioUrlStr + ": " + e.getMessage());
            return null;
        } finally {
            if (connection != null) {
                connection.disconnect(); // 关闭连接
            }
        }
    }

    /**
     * 判断Content-Type是否可能指示流媒体。
     * 这是一个启发式判断，可能需要根据实际情况调整。
     * @param contentType Content-Type字符串
     * @return 如果可能是流媒体则返回true
     */
    public static boolean isLikelyStreamingAudio(String contentType) {
        if (contentType == null) {
            return false;
        }
        String lowerCaseContentType = contentType.toLowerCase();
        // 常见的音频MIME类型，可能用于流媒体
        if (lowerCaseContentType.contains("audio/mpeg") ||
            lowerCaseContentType.contains("audio/aac") ||
            lowerCaseContentType.contains("audio/ogg") ||
            lowerCaseContentType.contains("audio/x-mpegurl") || // M3U播放列表
            lowerCaseContentType.contains("audio/x-scpls") ||   // PLS播放列表
            lowerCaseContentType.contains("application/vnd.apple.mpegurl") || // HLS
            lowerCaseContentType.contains("audio/mp4")) { // MP4音频流

            // 进一步判断：某些服务器可能在Content-Type中包含charset或其他参数
            // 仅根据MIME主类型和子类型判断
            return true;
        }
        return false;
    }

    public static void main(String[] args) {
        // 示例URL
        String streamingAudioUrl = "http://icecast.radiofrance.fr/fip-midfi.mp3"; // 示例流媒体URL
        String staticAudioUrl = "https://www.soundhelix.com/examples/mp3/SoundHelix-Song-1.mp3"; // 示例静态MP3 URL
        String nonAudioUrl = "https://www.example.com"; // 示例非音频URL

        String contentType1 = getAudioContentType(streamingAudioUrl);
        if (contentType1 != null) {
            System.out.println("Is '" + streamingAudioUrl + "' likely streaming? " + isLikelyStreamingAudio(contentType1));
        }

        System.out.println("---");

        String contentType2 = getAudioContentType(staticAudioUrl);
        if (contentType2 != null) {
            System.out.println("Is '" + staticAudioUrl + "' likely streaming? " + isLikelyStreamingAudio(contentType2));
        }

        System.out.println("---");

        String contentType3 = getAudioContentType(nonAudioUrl);
        if (contentType3 != null) {
            System.out.println("Is '" + nonAudioUrl + "' likely streaming? " + isLikelyStreamingAudio(contentType3));
        }
    }
}