你可以执行以下两项操作之一：
调用getResources()并遍历返回的URL集合，将它们作为清单读取，直到找到你的URL：
Enumeration<URL> resources = getClass().getClassLoader()
.getResources("Meta-INF/MANIFEST.MF");
while (resources.hasMoreElements()) {
try {
Manifest manifest = new Manifest(resources.nextElement().openStream());
// check that this is your manifest and do what you need or get the next one
...
} catch (IOException E) {
// handle
}
}
你可以尝试检查是否getClass().getClassLoader()是的实例java.net.urlclassloader。Sun的大多数类加载器包括AppletClassLoader。然后，你可以对其进行转换并调用findResource()已知的（至少对于applet而言）直接返回所需的清单：
urlclassloader cl = (urlclassloader) getClass().getClassLoader();
try {
URL url = cl.findResource("Meta-INF/MANIFEST.MF");
Manifest manifest = new Manifest(url.openStream());
// do stuff with it
...
} catch (IOException E) {
// handle
}
你可以先找到课程的URL。如果是JAR，则从那里加载清单。例如，
Class clazz = MyClass.class;
String className = clazz.getSimpleName() + ".class";
String classPath = clazz.getResource(className).toString();
if (!classPath.startsWith("jar")) {
// Class not from JAR
return;
}
String manifestPath = classPath.substring(0, classPath.lastIndexOf("!") + 1) +
"/Meta-INF/MANIFEST.MF";
Manifest manifest = new Manifest(new URL(manifestPath).openStream());
Attributes attr = manifest.getMainAttributes();
String value = attr.getValue("Manifest-Version");
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