如何获取资源“文件夹"?从我的 jar 文件里面? [英] How can I get a resource "Folder" from inside my jar File?

问题描述

我的项目根目录中有一个资源文件夹/包，我没有"想加载某个文件.如果我想加载某个文件，我会使用 class.getResourceAsStream ，我会没事的！！我真正想做的是加载一个文件夹".在资源文件夹中，在该文件夹内的文件上循环并获取每个文件的流并读取内容...假设在运行之前未确定文件名...我该怎么办?有没有办法在您的 jar 文件中获取文件夹内的文件列表?请注意，带有资源的 Jar 文件与运行代码的 jar 文件相同...

I have a resources folder/package in the root of my project, I "don't" want to load a certain File. If I wanted to load a certain File, I would use class.getResourceAsStream and I would be fine!! What I actually want to do is to load a "Folder" within the resources folder, loop on the Files inside that Folder and get a Stream to each file and read in the content... Assume that the File names are not determined before runtime... What should I do? Is there a way to get a list of the files inside a Folder in your jar File? Notice that the Jar file with the resources is the same jar file from which the code is being run...

推荐答案

终于找到了解决方案:

final String path = "sample/folder";
final File jarFile = new File(getClass().getProtectionDomain().getCodeSource().getLocation().getPath());

if(jarFile.isFile()) {  // Run with JAR file
    final JarFile jar = new JarFile(jarFile);
    final Enumeration<JarEntry> entries = jar.entries(); //gives ALL entries in jar
    while(entries.hasMoreElements()) {
        final String name = entries.nextElement().getName();
        if (name.startsWith(path + "/")) { //filter according to the path
            System.out.println(name);
        }
    }
    jar.close();
} else { // Run with IDE
    final URL url = Launcher.class.getResource("/" + path);
    if (url != null) {
        try {
            final File apps = new File(url.toURI());
            for (File app : apps.listFiles()) {
                System.out.println(app);
            }
        } catch (URISyntaxException ex) {
            // never happens
        }
    }
}

当您在 IDE 上运行应用程序时(不是使用 jar 文件)，第二个块才起作用，如果您不喜欢，可以将其删除.

The second block just work when you run the application on IDE (not with jar file), You can remove it if you don't like that.

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