自定义类加载器的代码

package com.cad.JvmTest;

import java.io.FileNotFoundException;

public class obj6 extends ClassLoader{

    /**
     * 把自定义的类加载写在findClass()方法中，
     * @param name
     * @return
     * @throws ClassNotFoundException
     */
    protected Class<?> findClass(String name) throws ClassNotFoundException {
        try{
            byte[] result = getClassFromCustompath(name);
            if(result == null){
                throw new FileNotFoundException();
            }else{
                return defineClass(name,result,0,result.length);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        throw new ClassNotFoundException(name);
    }

    private byte[] getClassFromCustompath(String name) {

        // 如果指定路径字节码文件进行了加密，则需要在此方法中进行解密操作。
        return null;
    }

    public static void main(String[] args) {
        obj6 obj = new obj6();
        try {
            Class<?> clazz = Class.forName("One",true,obj);
            Object object = clazz.newInstance();
            System.out.println(obj.getClass().getClassLoader());
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        }
    }
}