如何修正“不能转换为com.sun.speech.freetts.VoiceDirectory”的错误？

Question

我试图在我的java程序中使用FreeTTS (来自https://freetts.sourceforge.io/docs/index.php)，并且我得到了以下错误：java.lang.ClassCastException: com.sun.speech.freetts.en.us.cmu_time_awb.AlanVoiceDirectory cannot be cast to com.sun.speech.freetts.VoiceDirectory

我尝试将免费的TTS jar文件重新添加到我的项目中，这是我的代码：

import com.sun.speech.freetts.Voice;
import com.sun.speech.freetts.VoiceManager;

public class TextToSpeech {
//String voiceName = "kevin16";
VoiceManager freeVM;
Voice voice;
public TextToSpeech(String words) {
    freeVM = VoiceManager.getInstance();
    voice = VoiceManager.getInstance().getVoice("kevin16");
    if (voice != null) {
        voice.allocate();//Allocating Voice
    }

    try {
        voice.setRate(190);//Setting the rate of the voice
        voice.setPitch(150);//Setting the Pitch of the voice
        voice.setVolume(3);//Setting the volume of the voice
        SpeakText(words);// Calling speak() method


    } catch (Exception e1) {
        e1.printStackTrace();
    }



}

public void SpeakText(String words) {
    voice.speak(words);
}

我从另一个类调用TextToSpeech构造函数，如下所示：

 new TextToSpeech("Hello World");

如有任何帮助或建议，将不胜感激！

Answer 1

像这样改变TextToSpeech结构：

public TextToSpeech(String words) {
    System.setProperty("freetts.voices", "com.sun.speech.freetts.en.us.cmu_us_kal.KevinVoiceDirectory");
    voice = VoiceManager.getInstance().getVoice("kevin16");
    if (voice != null) {
        voice.allocate();// Allocating Voice
        try {
            voice.setRate(190);// Setting the rate of the voice
            voice.setPitch(150);// Setting the Pitch of the voice
            voice.setVolume(3);// Setting the volume of the voice
            SpeakText(words);// Calling speak() method

        } catch (Exception e1) {
            e1.printStackTrace();
        }

    } else {
        throw new IllegalStateException("Cannot find voice: kevin16");
    }
}

这样做的目的是指示自由用户使用com.sun.speech.freetts.en.us.cmu_us_kal.KevinVoiceDirectory类而不是AlanVoiceDirectory类。