在Jar中读取文件（ZipInputStream等） [英] Reading Files Within a Jar(ZipInputStream, etc.)

问题描述

我正在用java编写一个游戏，所有的工作或多或少都像你期望的那样编码，但是我碰到的一个问题是将图像和声音文件读入游戏。我写了一个在Eclipse中运行得很好的方法，但是当我尝试在可运行的jar（使用Eclipse导出）中测试它时，我的游戏就停留在加载屏幕上，因为它无法读取文件。我意识到存在的问题是您不能在Jar中创建File对象，您必须使用流。这可以工作，但图像/声音位于文件夹内，我不是很确定如何可以读取文件夹中的文件与流（即不知道文件的数量）。正因为如此，我试图用ZipInputStream重写方法（在发布之前，我在寻找解决方案时发现这是推荐的）。这就是现在的方法：

  imageMap = new HashMap< String，BufferedImage>（）; 
 String imagebase =/ images; 
 CodeSource src = PlatformerCanvas.class.getProtectionDomain（）。getCodeSource（）; 
 if（src！= null）
 {
 URL jar = src.getLocation（）; 
尝试
 {
 ZipArchiveInputStream zip = new ZipArchiveInputStream（jar.openStream（））; 
 ZipArchiveEntry ze = null; （（ze = zip.getNextZipEntry（））！= null）
 
 
 System.out.println（ze.getName（））; 
 if（ze.getName（）。startsWith（imagebase）&& ze.getName（）。endsWith（。png））
 {
 loading ++; 
 imageMap.put（ze.getName（）。replaceAll（imagebase +/，），ImageIO.read（this.getClass（）。getResource（ze.getName（））））; 
} 
} 
 zip.close（）; 
 System.out.println（Finished Loading Images）; 
 
 catch（IOException e）
 {
 e.printStackTrace（）; 
 
 
 
 
 
 
 $ b 
然而，这完全跳过了while循环，因为getNextZipEntry返回null。我尝试使用基本的Zip归档库，但有人推荐Apache Commons库，但都没有工作。我的罐子设置是这样的：
  Jar 
 / game / gameClasses 
 / images / imageFiles 
 / sounds / soundFiles 
 / whateverOtherFoldersEclipseCreated 
  
所以我的问题是这样的：为什么不这个目前的方法工作，我该如何解决？或者，如何以不同的方式加载图像/声音？ 
我看了很多其他的问题，尝试了很多不同的东西，但是都没有为我工作。 $ b 
或者，我怎样才能以不同的方式加载图像/声音？ 
 
一个常见的技术是包括Jar中已知位置的资源列表。阅读列表，然后迭代这些行（假设每个资源一行）&阅读这些路径。
 
I'm writing a game in java and all is working more or less well, as you would expect when coding, but one issue I have come across is reading the image and sound files into the game. I wrote a method that works really well within Eclipse, but as soon as I try to test it in a runnable jar (exported using Eclipse) my game gets stuck on the loading screen because it can't read the files. I realized the problem there being that you cannot create File objects within a Jar, you have to use streams. This could work, but the images/sounds are located within folders and I'm not very sure how you can read files within a folder with streams(i.e not knowing the amount of files). Because of this I have tried to rewrite the method using the ZipInputStream (I found this as recommended when looking for solutions prior to posting this). This is what the method looks like now:
imageMap = new HashMap<String, BufferedImage>();
    String imagebase = "/images";
    CodeSource src = PlatformerCanvas.class.getProtectionDomain().getCodeSource();
    if(src != null)
    {
        URL jar = src.getLocation();
        try
        {
            ZipArchiveInputStream zip = new ZipArchiveInputStream(jar.openStream());
            ZipArchiveEntry ze = null;
            while((ze = zip.getNextZipEntry()) != null)
            {
                System.out.println(ze.getName());
                if(ze.getName().startsWith(imagebase) && ze.getName().endsWith(".png"))
                {
                    loading++;
                    imageMap.put(ze.getName().replaceAll(imagebase + "/", ""), ImageIO.read(this.getClass().getResource(ze.getName())));
                }
            }
            zip.close();
            System.out.println("Finished Loading Images");
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }
However, this completely skips over the while loop because getNextZipEntry return null. I tried using the base Zip archive libraries, but someone recommended the Apache Commons libraries, but neither worked. My Jar setup is this:
Jar
/game/gameClasses
/images/imageFiles
/sounds/soundFiles
/whateverOtherFoldersEclipseCreated
So my question is this: Why isn't this current method working and how do I fix it? Or, how can I load the images/sounds in a different way that works?
I have looked at many other questions and tried many different things, but none worked for me.
解决方案

  
Or, how can I load the images/sounds in a different way that works?
One common technique is to include a list of resources in a known location in the Jar.  Read the list, then iterate the lines (presuming one line per resource) & read the paths that way.

                        
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