下面是我的代码,我不理解“ECHONEST api 4 NULL指针异常”的原因:
package com.main;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.echonest.api.v4.EchoNestAPI;
import com.echonest.api.v4.EchoNestException;
import com.echonest.api.v4.Track;
import com.echonest.api.v4.TrackAnalysis;
public class SongAnalysis {
private static final String API_KEY = "14CPBOK0IFN0HRC0R";
public String getTempo(String fileName){
return null;
}
public static void main (String [] args)throws EchoNestException, IOException{
EchoNestAPI echoNest = new EchoNestAPI(API_KEY);
File file = new File("C:\\Users\\wooh\\workspace\\SongAnalysis\\songs\\b.mp3");
Track track = echoNest.uploadTrack(file,false );
track.waitForAnalysis(30000);
TrackAnalysis a = track.getAnalysis();
System.out.println("Tempo" + a.getTempo());
}
}
答案 0 :(得分:0)
您的NPE可能发生的是:
echoNest
为空。track
为空。a
为空。您需要查明NullPointerException
发生的特定位置,然后确保在实例化对象时,返回所需的对象。