import java.util.Base64;

import java.lang.reflect.Method;

public class HelloClassLoader extends ClassLoader {

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

Class<?> clazz=new HelloClassLoader().findClass("Hello");

// 创建对象

Object instance=clazz.getDeclaredConstructor().newInstance();

for (Method m : clazz.getDeclaredMethods()) {

System.out.println(clazz.getSimpleName() + "." + m.getName());

// 调用实例方法

m.invoke(instance);

}

}

@Override

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

// Linux 命令行获取base64

// cat Hello.xlass |base64|perl -e 'while(<>){chomp;print}print "\n"'

String helloBase64 = "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";

byte[] bytes = decode(helloBase64);

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

bytes[i]=(byte)(255-bytes[i]);

}

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

}

public byte[] decode(String base64) {

return Base64.getDecoder().decode(base64);

}

}