JVM类加载器

public class MyClassLoader extends ClassLoader {

    private final static String DEFAULT_DIR = "C:\\Users\\xxx\\Desktop\\test\\";

    private String dir = DEFAULT_DIR;

    private String classLoaderName;

    public String getDir() {
        return dir;
    }

    public void setDir(String dir) {
        this.dir = dir;
    }

    public String getClassLoaderName() {
        return classLoaderName;
    }
    
    public MyClassLoader() {
        super();
    }

    public MyClassLoader(String classLoaderName) {
        super();
        this.classLoaderName = classLoaderName;
    }

    public MyClassLoader(String classLoaderName, ClassLoader parent) {
        super(parent);
        this.classLoaderName = classLoaderName;
    }


    @Override
    protected Class<?> findClass(String name)
            throws ClassNotFoundException {
        String classPath = name.replace(".", "/");
        File classFile = new File(dir, classPath + ".class");
        if (!classFile.exists()) {
            throw new ClassNotFoundException("The class " + name + " not found under " + dir);
        }

        byte[] classBytes = loadClassBytes(classFile);
        if (null == classBytes || classBytes.length == 0)
            throw new ClassNotFoundException("load the class " + name + " failed");

        return this.defineClass(name, classBytes, 0, classBytes.length);
    }

    private byte[] loadClassBytes(File classFile) {
        try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
             FileInputStream fis = new FileInputStream(classFile)) {
            byte[] buffer = new byte[1024];
            int len;
            while ((len = fis.read(buffer)) != -1) {
                baos.write(buffer, 0, len);
            }
            baos.flush();
            return baos.toByteArray();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }


}

public class Test {

    public static void main(String[] args) throws Exception {
        MyClassLoader classLoader = new MyClassLoader();
        Class<?> cls = classLoader.loadClass("com.moreas.c527.SimObjec");
        System.out.println(cls.getClassLoader());
        System.out.println(cls.getClassLoader().getParent());

    }
}