Java字节数组操作：解决NullPointerException与优化实践

ArrayList<byte[]> userBytes = userAudioData.getBytes();

// ... 其他代码 ...

int length = 0;
// 问题可能出现在这里：如果userBytes中包含null元素
for (byte[] bytes : userBytes) {
    length += bytes.length; // 尝试访问null的length属性会抛出NPE
}

byte[] decodedData = new byte[length];
int i = 0;
// 问题也可能出现在这里：如果userBytes中包含null元素
for (byte[] bytes : userBytes) {
    for (byte sampleByte : bytes) { // 尝试对null进行迭代会抛出NPE
        decodedData[i++] = sampleByte;
    }
}
// ... 后续代码 ...

ArrayList<byte[]> userBytes = userAudioData.getBytes();

if (userBytes.size() <= settings.getInt("MaxLength") * 50) {
    User user = userAudioData.getUser();

    int length = 0;
    for (byte[] bytes : userBytes) {
        // 在访问bytes.length之前，先检查bytes是否为null
        if (null != bytes) {
            length += bytes.length;
        }
    }

    byte[] decodedData = new byte[length];
    int i = 0;

    for (byte[] bytes : userBytes) {
        // 在迭代bytes之前，先检查bytes是否为null
        if (null != bytes) {
            for (byte sampleByte : bytes) {
                decodedData[i++] = sampleByte;
            }
        }
    }

    File file = new File(instance.getDataFolder().getAbsolutePath() + "/temp/" + user.getId() + ".wav");

    try {
        AudioSystem.write(new AudioInputStream(new ByteArrayInputStream(decodedData),
                        AudioReceiveHandler.OUTPUT_FORMAT, decodedData.length),
                AudioFileFormat.Type.WAVE, file);
    } catch (IOException exception) {
        exception.printStackTrace();
    }

    // 后续的语音识别配置和处理
    SpeechConfig speechConfig = SpeechConfig.fromSubscription(
            settings.getString("ApiKey"),
            settings.getString("ApiRegion"));

    speechConfig.setSpeechRecognitionLanguage(
            settings.getString("Language"));

    AudioConfig audioConfig = AudioConfig.fromWavFileInput(file.getAbsolutePath());

    SpeechRecognizer recognizer = new SpeechRecognizer(speechConfig, audioConfig);

    try {
        SpeechRecognitionResult result = recognizer.recognizeOnceAsync().get();

        // 示例：使用Logger进行日志记录，而非System.out.print
        // Logger.info("RECOGNIZED: " + result.getText()); 
        System.out.println("RECOGNIZED: " + result.getText()); // 替换为实际的Logger

        if (!file.delete())
            // Logger.warn("Cannot delete temporary file " + file.getName() + ".");
            System.err.println("Cannot delete temporary file " + file.getName() + "."); // 替换为实际的Logger
    } catch (Exception exception) {
        exception.printStackTrace();
    }
}
userAudioData.clear();