Question

我正在使用Netbeans而我只是想编写一个简单的程序（用于实践目的），它将打包的文件流式传输到已编译的.JAR中。在这种情况下，打包文件是一个音频剪辑。

我已经清理并构建了我的项目，并在/ src / package / MyResources /文件夹中包含了我要传输的文件，并且InputStream也指向了相应的位置。

当我在Netbeans中运行调试或“运行项目”时，流工作正常并找到打包的资源。因此播放音频文件。

当我尝试使用“java -jar MyJar.jar”从命令提示符运行已编译的.JAR时，无法再找到打包的资源并抛出IOException。使用归档程序打开.jar会显示资源文件IS与编译前定义的文件夹结构相同。

我不确定是否需要一些代码？但我不明白为什么无法访问打包的资源。

编辑：所以当前的代码应用了很多有用的用户提供的内容：Trouble playing wav in Java

package audioplayer;

import javax.sound.sampled.*;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.IOException;
import javax.sound.sampled.LineEvent.Type;

public class ClipPlayer
    {        
    public static void play()throws UnsupportedAudioFileException,     LineUnavailableException, InterruptedException, FileNotFoundException
        {
        class AudioListener implements LineListener//Sub class that can be used to ensure file completion.
            {
            //AudioListener ensures that the streamed file finishes streaming (or playing in our case) before the thread can be stopped.
            private boolean done=false;

            @Override
            public synchronized void update(LineEvent event)
                {
                Type eventType = event.getType();
                if (eventType == Type.STOP || eventType == Type.CLOSE)
                    {
                    done = true;
                    notifyAll();
                    }
                }

            public synchronized void waitUntilDone() throws InterruptedException
                {
                while(!done)
                    {
                    wait();
                    }
                }
            }
        try
            {
            InputStream my_audio=ClipPlayer.class.getClassLoader().getResourceAsStream("Resources/Music/background.wav");
            if(my_audio!=null)
                {
                //Since we are embedding the audio file in the class, we do not need to create a file object.
                AudioListener bg_listener = new AudioListener();
                AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(my_audio);//We create a player with the indicated resource.
                try 
                    {
                    Clip clip = AudioSystem.getClip();//The audio system has the file ready to stream now, we capture that stream.
                    clip.addLineListener(bg_listener);//Then we add the audiolistener so we ensure completion if something tells the thread to stop.
                    clip.open(audioInputStream);//Open the stream for playing, we're almost there now.

                    try 
                        {
                        clip.start();//Start playing the audio stream. Note this creates a seperate thread.
                        bg_listener.waitUntilDone();//So we can invoke the listener while the clip is playing.
                        } 

                    finally //A finally statement is used to ensure the resource stream is properly closed even if an error occurs.
                        {
                        clip.close();
                        }
                    } 

                finally //We do the same for the AudioSystem too.
                    {
                    audioInputStream.close();
                    }
                }

            else
                {
                throw new FileNotFoundException("File not found.");
                }
            }

        catch(IOException dir)
            {
            System.err.println("Could not get packaged resource.");
            }
        }
    }

因此，当我在Netbeans中调试或运行时，我没有收到任何错误。当我尝试通过命令行运行程序但是使用java -jar MyClass.jar时，我被告知“无法获取打包资源。”

MyClass.jar包含一行（使用try / catch）：

ClipPlayer.play()

Java：无法访问打包资源

0 个答案: