为什么Java无法在主源文件夹内找到文件?

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英文:

Why can't Java find a file inside of the main source folder?

问题

我正在制作一个游戏,但 Java 似乎找不到我的文件。

我的播放声音函数是:

void playSound(String soundLocation) {
    try {
        File soundPath = new File(soundLocation);

        if (soundPath.exists()) {
            AudioInputStream audioInput = AudioSystem.getAudioInputStream(soundPath);
            Clip clip = AudioSystem.getClip();
            clip.open(audioInput); // 添加这行以打开音频流
            clip.start();
            JOptionPane.showMessageDialog(null, "Press OK to stop playing");
        } else {
            System.out.println("Can't find file");
        }
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

在我的主类中我有:

package game;

public class GUI_Handler {
    public static void main(String[] args) {
        String soundPath = "c://users/harry/java workspace/SlavaSourcecode/src/game/jump.wav";

        SOUND_Handler soundStuff = new SOUND_Handler();
        soundStuff.playSound(soundPath);
    }
}

它会输出 "Can't find file"。

请帮忙看看!谢谢,Harry

英文:

I'm working on a game, and Java can't seem to find my file.

My play sound function is :

 void playSound(String soundLocation) {
	
	try
	{
		File soundPath = new File(soundLocation);
		
		if (soundPath.exists()) {
			AudioInputStream audioInput = AudioSystem.getAudioInputStream(soundPath);
			Clip clip = AudioSystem.getClip();
			clip.start();
			JOptionPane.showMessageDialog(null, "Press OK to stop playing");
		} else {
			System.out.println("Can't find file");
		}
	}
	
	catch(Exception ex) {
		ex.printStackTrace();
	}
	
  }

In my main class I have :

 package game;

 public class GUI_Handler {

 public static void main(String[] args) {
	String soundPath = "c://users/harry/java workspace/SlavaSourcecode/src/game/jump.wav";
	
	SOUND_Handler soundStuff = new SOUND_Handler();
	soundStuff.playSound(soundPath);
  }

}

It outputs " Can't find file");

Please help! Thanks,
Harry

答案1

得分: 1

你必须将所有的 / 替换为 \,但在Java中,你还必须用另一个反斜杠对反斜杠进行转义,以防止它被视为特殊字符。

因此,一旦你用 \ 替换了所有的 /,你还需要将所有的 \ 替换为 \\

如果你采用你已经有的内容,你可以修改 soundPath 如下:

soundPath.replace("//","\\").replace("\\","\\\\");

然后它应该可以工作。

或者你可以手动编辑路径为:

"c:\\users\\harry\\java workspace\\SlavaSourcecode\\src\\game\\jump.wav";

但请注意,这在其他机器上不太适用。实际上,更好的做法是使用构建工具(Gradle/Maven),它具有标准的文件结构(大多数开发者现在使用的“约定”)。文件结构有两个目录:一个用于源代码 src/main/java,另一个用于资源 src/main/resources。通常你会把这些资源放在 resources 目录中,并从资源目录中加载 jump.wav,它在类路径上始终是相对可访问的。

英文:

You must replace all / with \ but in Java you must also escape the backslash with another backslash to prevent it being treated as a special character.

So, once you've replaced the /s with \ you then need to replace all \ with \\:

If you take what you already have you can amend soundPath to:

soundPath.replace("//","\").replace("\","\\");

And it should work.

Or you can manually edit the path to:

"c:\\users\\harry\\java workspace\\SlavaSourcecode\\src\\game\\jump.wav"

Note though that this is not at all portable to other machines. In reality what would be better is if you used a build tool (Gradle/Maven) which has a standard file structure (a "convention" used by most developers these days). The file structure has two directories: one for source code src/main/java, and another for resources src/main/resources. Typically you'd stick any such assets in the resources directory and load the jump.wav from the resources dir which is always accessible relatively on the classpath.

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  • 本文由 发表于 2020年10月15日 04:52:23
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