package classloader;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.InputStream;

import java.net.URL;

/**

* Load class from network

*/

public class NetworkClassLoader extends ClassLoader {

@Override

protected Class<?> findClass(String name) throws ClassNotFoundException {

byte[] classData = downloadClassData(name);

if (classData == null) {

super.findClass(name);

} else {

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

}

return null;

}

private byte[] downloadClassData(String name) {

String path = "http://localhost" + File.separatorChar + "java" + File.separatorChar + name.replace('.', File.separatorChar) + ".class";

System.out.printf("localPath: %s\n", path);

try {

URL url = new URL(path);

InputStream ins = url.openStream();

ByteArrayOutputStream baos = new ByteArrayOutputStream();

int bufferSize = 4096;

byte[] buffer = new byte[bufferSize];

int bytesNumRead = 0;

while ((bytesNumRead = ins.read(buffer)) != -1) {

baos.write(buffer, 0, bytesNumRead);

}

return baos.toByteArray();

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

public String getName() {

System.out.printf("Real NetworkClassLoader\n");

return "networkClassLoader";

}

}