java.io.FilePermission 异常 - 从 jar 文件读取？

Question

嗨，我有一个 Java Applet，它可以播放本地文件系统的文件。当我将 Applet 嵌入网页时，出现 io.FilePermission 异常。我知道解决这个问题的唯一方法是让我的 Applet 签名，但我不希望这样做。

我如何从它自己的 jar 文件中读取该文件？据我所知，这将是最好的方法。

感谢大家的帮助。

这是我的代码

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class PlaySoundsApplet extends Applet implements ActionListener{
  Button play,stop;
  AudioClip audioClip;

  public void init(){
  play = new Button("  Play in Loop  ");
  add(play);
  play.addActionListener(this);
  stop = new Button("  Stop  ");
  add(stop);
  stop.addActionListener(this);
  audioClip = getAudioClip(getCodeBase(), "clip.wav"); //Exception here trying to read from the www root instead of jar file

  }

  public void actionPerformed(ActionEvent ae){
  Button source = (Button)ae.getSource();
  if (source.getLabel() == "  Play in Loop  "){
  audioClip.play();
  }
  else if(source.getLabel() == "  Stop  "){
  audioClip.stop();
  }
  }
}

更新的代码:

  public class PlaySoundsApplet extends Applet implements ActionListener{
  Button play,stop;
  AudioClip audioClip;

  public void init(){
  play = new Button("  Play in Loop  ");
  add(play);
  play.addActionListener(this);
  stop = new Button("  Stop  ");
  add(stop);
  stop.addActionListener(this);
  try {
    AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(new File("resources/clip.wav"));
    Clip audioClip = AudioSystem.getClip();
    audioClip.open(audioInputStream);
} catch (UnsupportedAudioFileException e1) {System.out.println("Unsoported Error");} 
  catch (IOException e1) {System.out.println("IO Error");} catch (LineUnavailableException e) {System.out.println("Line unavailable Error");}
  }

  public void actionPerformed(ActionEvent ae){
  Button source = (Button)ae.getSource();
  if (source.getLabel() == "  Play in Loop  "){
  audioClip.play();
  }
  else if(source.getLabel() == "  Stop  "){
  audioClip.stop();
  }
  }
}

Answer 1

尝试

URL url = getDocumentBase();

AudioClip audioClip = getAudioClip(url, "music/JButton.wav")

项目结构