import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;

public class Main {
	/*
	 * 分别打印BootstrapClassLoder ExtClassLoader AppClassLoader的加载路径
	 */
	public static void main(String[] args) {
		// 1、获取类加载器
		Class mainClass = Main.class;
		ClassLoader mainLoader = mainClass.getClassLoader();
		System.out.println("mainLoader 's Name: " + mainLoader.toString());

		// 2、打印AppClassLoader的加载路径
		URL[] mUrls = ((URLClassLoader) mainLoader).getURLs();
		print(mUrls);

		// 3、通过getParent方法,获取mainLoader中的parent字段
		ClassLoader parentLoader = mainLoader.getParent();
		System.out.println("paerntLoader 's Name: " + parentLoader.toString());

		// 4、打印ExtClassLoader的加载路径
		URL[] mUrlsExt = ((URLClassLoader) parentLoader).getURLs();
		print(mUrlsExt);

		// 5、通过getParent方法,获取parentLoader中的parent字段
		ClassLoader parentLoader1 = parentLoader.getParent();
		System.out.println("paerntLoader1 's Name: " + parentLoader1);

		// 6、打印BootrapClassLoader的加载路径
		try {
			Class luancher = Class.forName("sun.misc.Launcher");
			Method methodGetClassPath = luancher.getDeclaredMethod("getBootstrapClassPath", null);
			if (methodGetClassPath != null) {
				methodGetClassPath.setAccessible(true);
				Object object = methodGetClassPath.invoke(null, null);
				if (object != null) {
					Method methodGetURLs = object.getClass().getDeclaredMethod("getURLs", null);
					if (methodGetURLs != null) {
						methodGetURLs.setAccessible(true);
						URL[] murlBoot = (URL[]) methodGetURLs.invoke(object, null);
						print(murlBoot);
					}
				}

			}
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (NoSuchMethodException e) {
			e.printStackTrace();
		} catch (SecurityException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InvocationTargetException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	// 打印数组
	private static void print(URL[] mUrls) {
		for (URL url : mUrls) {
			System.out.println(url);
		}
	}

}