package lang;

import java.io.IOException;

import java.io.InputStream;

/**

* @author：chenxun

* createDate：2016年11月9日 上午12:09:13

* Theme:

* reference:

* descript:

*/

public class TCustomClassLoader {

@SuppressWarnings("unused")

public static void main(String[] args) throws Exception {

ClassLoader classLoader = new ClassLoader() {

@Override

public Class<?> loadClass(String name)throws ClassNotFoundException {

try {

String className = name.substring(name.lastIndexOf(".") + 1) + ".class";

InputStream inputStream = getClass().getResourceAsStream(className);

if (inputStream != null) {

//采用自己定义的类加载器

byte[] byte1 = new byte[inputStream.available()];

System.out.println(inputStream.available());

// for (int i = 0; i < byte1.length; i++) {

// System.out.println(byte1[i]);

// }

inputStream.read(byte1);

System.out.print(byte1.length);

return defineClass(name, byte1, 0, byte1.length);

} else {

// 等于空采用默认父类类加载器

return super.loadClass(name);

}

} catch (IOException e) {

throw new ClassNotFoundException(name);

}

}

};

Object newInstance = classLoader.loadClass("lang.TCustomClassLoader").newInstance();

System.out.println(newInstance.hashCode());

TCustomClassLoader myClassLoader = new TCustomClassLoader();

System.out.println(new TCustomClassLoader().hashCode());

System.out.println(newInstance instanceof lang.TCustomClassLoader);

// Launcher launcher = sun.misc.Launcher.getLauncher();

// URLClassPath bootstrapClassPath = sun.misc.Launcher.getBootstrapClassPath();

// System.out.println(launcher);

// URL[] urLs = bootstrapClassPath.getURLs();

// for (URL url : urLs) {

// System.out.println(url.getPath());

// }

}

}