用Class的getResource()获得某个类的绝对路径

 URL url  =   this .getClass().getResource( " /javax/servlet/http/HttpSessionBindingListener.class " );
 System.out.println(url);
控制台输出:
jar:file:/D:/bea/weblogic81/server/lib/weblogic.jar!/javax/servlet/http/HttpSessionBindingListener.class

见 http://schnell18.javaeye.com/blog/39214

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