实用工具
查找运行时class来自哪个版本的jar包
String className = Appender.class.getName();
className = className.replace('.', '/');
String resource = "/" + className + ".class";
URL url = Appender.class.getResource(resource);
System.out.println(url.getFile());
String className = Appender.class.getName();
className = className.replace('.', '/');
String resource = "/" + className + ".class";
URL url = Appender.class.getResource(resource);
System.out.println(url.getFile());