通过以下方法可以进指定路径下的类
下面是load D:\test\zy\Test2.class 类
下面是load D:\test\zy\Test2.class 类
File file = new File("D:\\test\\zy");
// Convert File to a URL
URL url = file.toURL();
URL[] urls = new URL[]{url};
// Create a new class loader with the directory
ClassLoader cl = new URLClassLoader(urls);
// Load in the class; Test2.class should be located in
// the directory file:/D:\test\zy\
Class cls = cl.loadClass("Test2");