异常在Java中的语音识别

Question

我面临着一些例外下面的代码：

import java.io.FileReader; 
    import java.io.IOException; 
    import java.util.Locale; 
    import javax.speech.AudioException; 
    import javax.speech.Central; 
    import javax.speech.EngineException; 
    import javax.speech.EngineModeDesc; 
    import javax.speech.EngineStateError; 
    import javax.speech.recognition.GrammarException; 
    import javax.speech.recognition.Recognizer; 
    import javax.speech.recognition.Result; 
    import javax.speech.recognition.ResultAdapter; 
    import javax.speech.recognition.ResultEvent; 
    import javax.speech.recognition.ResultToken; 
    import javax.speech.recognition.RuleGrammar; 

    public class HelloWorld extends ResultAdapter { 

     static Recognizer rec; 

     // Receives RESULT_ACCEPTED event: print it, clean up, exit 
     @Override 
     public void resultAccepted(ResultEvent e) { 
      Result r = (Result) (e.getSource()); 
      ResultToken tokens[] = r.getBestTokens(); 

      for (int i = 0; i < tokens.length; i++) { 
       System.out.print(tokens[i].getSpokenText() + " "); 
      } 
      System.out.println(); 

      try { 
       // Deallocate the recognizer and exit 
       rec.deallocate(); 
      } catch (EngineException | EngineStateError ex) { 
       System.out.println(ex.toString()); 
      } 
      System.exit(0); 
     } 

     public static void main(String args[]) { 
      try { 
       // Create a recognizer that supports English. 
       rec = Central.createRecognizer(
         new EngineModeDesc(Locale.ENGLISH)); 

       // Start up the recognizer 
       rec.allocate(); 

       // Load the grammar from a file, and enable it 
       FileReader reader = new FileReader(args[0]); 
       RuleGrammar gram = rec.loadJSGF(reader); 
       gram.setEnabled(true); 

       // Add the listener to get results 
       rec.addResultListener(new HelloWorld()); 

       // Commit the grammar 
       rec.commitChanges(); 

       // Request focus and start listening 
       rec.requestFocus(); 
       rec.resume(); 
      } catch (IllegalArgumentException | EngineException | SecurityException | GrammarException | IOException | AudioException e) { 
       e.printStackTrace(); 
      } 
     } 
    } 

例外： - 在Demo5.HelloWorld.main（的HelloWorld 异常线程 “main” 显示java.lang.NullPointerException 。的java：55） Java结果：1个

异常在此行​​中发生（第55行）：

// Start up the recognizer 
rec.allocate(); 

Answer 1

的Recognizer显示为空。看到这一行：

rec = Central.createRecognizer(new EngineModeDesc(Locale.ENGLISH)); 

的docs表明，这是与你正在为createRecognizer参数一个问题：如果没有与所需的性质该方法返回null没有识别器

。

至于解决null识别器的原因，第二个答案this question可能会有所帮助。