StackOverflow2013

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15720973
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0
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2013-03-30T16:46:31.387
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2016-07-12T18:47:11.353
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2016-07-12T18:47:11.353
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2103602
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2103602
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15720822
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2
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<p>Unfortunately, Java doesn't provide an easy way to list classes in the "native" JRE. That leaves you with a couple of options: (a) for any given JAR file, you can list the entries inside that JAR file, find the <code>.class</code> files, and then determine which Java class each <code>.class</code> file represents; or (b) you can use a library that does this for you.</p> <h2>Option (a): Scanning JAR files manually</h2> <p>In this option, we'll fill <code>classNames</code> with the list of all Java classes contained inside a jar file at <code>/path/to/jar/file.jar</code>.</p> <pre><code>List<String> classNames = new ArrayList<String>(); ZipInputStream zip = new ZipInputStream(new FileInputStream("/path/to/jar/file.jar")); for (ZipEntry entry = zip.getNextEntry(); entry != null; entry = zip.getNextEntry()) { if (!entry.isDirectory() && entry.getName().endsWith(".class")) { // This ZipEntry represents a class. Now, what class does it represent? String className = entry.getName().replace('/', '.'); // including ".class" classNames.add(className.substring(0, className.length() - ".class".length())); } } </code></pre> <h2>Option (b): Using specialized reflections libraries</h2> <h3>Guava</h3> <p><a href="https://github.com/google/guava">Guava</a> has had <a href="https://google.github.io/guava/releases/14.0/api/docs/com/google/common/reflect/ClassPath.html"><code>ClassPath</code></a> since at least 14.0, which I have used and liked. One nice thing about <code>ClassPath</code> is that it doesn't load the classes it finds, which is important when you're scanning for a large number of classes.</p> <pre><code>ClassPath cp=ClassPath.from(Thread.currentThread().getContextClassLoader()); for(ClassPath.ClassInfo info : cp.getTopLevelClassesRecurusive("my.package.name")) { // Do stuff with classes here... } </code></pre> <h3>Reflections</h3> <p>I haven't personally used <a href="https://github.com/ronmamo/reflections">the Reflections library</a>, but it seems well-liked. Some great examples are provided on the website like this quick way to load all the classes in a package provided by <em>any</em> JAR file, which may also be useful for your application.</p> <pre><code>Reflections reflections = new Reflections("my.project.prefix"); Set<Class<? extends SomeType>> subTypes = reflections.getSubTypesOf(SomeType.class); Set<Class<?>> annotated = reflections.getTypesAnnotatedWith(SomeAnnotation.class); </code></pre>
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