Java程序无法播放音频片段求助：本地与网络音频均无声

Hey there! Let's work through your audio playback problems step by step—first clearing up your format questions, then fixing why your code isn't producing sound.

Supported Audio Formats for Applet.AudioClip #

The AudioClip class from the applet API does not require .au format exclusively. It natively supports:

• WAV (PCM-encoded, the most common WAV type)
• AU (u-law or PCM encoding)
• AIFF (limited support, depending on your Java version and operating system)

MP3 is not natively supported by AudioClip—you’d need additional libraries like JavaFX Media or third-party tools (e.g., JLayer) to play MP3 files.

Why Your Code Isn’t Playing Sound #

Your code has two key issues preventing audio playback:

1. Incorrect Local File URL Format
   When you enter a path like "file:myAudioclip.wav", that’s not a valid file URL. For local files:

   • On Windows, use a full path like "file:///C:/your-folder/myAudioclip.wav" (note the three slashes)
   • On macOS/Linux, use "file:///home/your-user/myAudioclip.wav"
     Manually typing URLs is error-prone—using the File class to generate a URL is far more reliable.

2. Legacy Applet API Limitations
   The Applet class and its newAudioClip method are deprecated in modern Java versions. They’re designed for browser applets, not standalone desktop programs, which leads to unpredictable behavior like silent playback.

Fixed Code Example #

Let’s rewrite your code using javax.sound.sampled.Clip—a modern, desktop-friendly audio API that avoids applet-related issues:

import javax.sound.sampled.*;
import javax.swing.*;
import java.io.File;

public class AudioPlayer {
    public static void main(String[] args) {
        String filePath = JOptionPane.showInputDialog("Enter path to WAV file:");
        if (filePath == null || filePath.isEmpty()) {
            JOptionPane.showMessageDialog(null, "No file path entered!");
            return;
        }

        File audioFile = new File(filePath);
        try {
            AudioInputStream audioStream = AudioSystem.getAudioInputStream(audioFile);
            Clip clip = AudioSystem.getClip();
            clip.open(audioStream);
            
            // Start continuous looping
            clip.loop(Clip.LOOP_CONTINUOUSLY);
            JOptionPane.showMessageDialog(null, "Playing audio—click OK to stop.");
            
            // Clean up resources when done
            clip.stop();
            clip.close();
            audioStream.close();
        } catch (Exception e) {
            JOptionPane.showMessageDialog(null, "Error playing audio: " + e.getMessage());
            e.printStackTrace();
        }
    }
}

Key Improvements #

• Uses the standard javax.sound.sampled package (built for desktop Java audio)
• Handles local file paths reliably via the File class (no manual URL formatting)
• Includes error handling to show you exactly what’s wrong (e.g., missing file, unsupported format)
• Keeps the program running until you click "OK" (so audio doesn’t stop immediately)

Quick Testing Tips #

• If your WAV file is in the same folder as your compiled class, just enter the filename (e.g., myAudioclip.wav) instead of a full path
• Ensure your WAV file is PCM-encoded (most standard WAVs are—compressed WAVs may not work with Clip)

内容的提问来源于stack exchange，提问作者N00BSTER