原文链接   译者：司余

Java的JarURLConnection类用来连接Java Jar文件。一旦连接上，你可以获取Jar文件的信息。一个简单的例子如下：

String urlString = "http://butterfly.jenkov.com/"
                 + "container/download/"
                 + "jenkov-butterfly-container-2.9.9-beta.jar";

URL jarUrl = new URL(urlString);
JarURLConnection connection = new JarURLConnection(jarUrl);

Manifest manifest = connection.getManifest();

JarFile jarFile = connection.getJarFile();
//do something with Jar file...