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...转载自 并发编程网 - ifeve.com
相关资源：Java的HttpURLConnection的封装类