自定义ClassLoader加载加密的class文件

package com.yd.wmsc.util;public class Test {
public void say(){
System.out.println("Say Hello");
}
}

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;public class FileUtils { public static void test(String path){
File file = new File(path);
try {
FileInputStream fis = new FileInputStream(file);
FileOutputStream fos = new FileOutputStream(path+"en");
int b = 0;
int b1 = 0;
try {
while((b = fis.read()) != -1){
//每一个byte异或一个数字2
fos.write(b ^ 2);
}
fos.close();
fis.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}}

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;public class DeClassLoader extends ClassLoader { private String mLibPath; public DeClassLoader(String path) {
// TODO Auto-generated constructor stub
mLibPath = path;
} @Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
// TODO Auto-generated method stub String fileName = getFileName(name); File file = new File(mLibPath,fileName); try {
FileInputStream is = new FileInputStream(file); ByteArrayOutputStream bos = new ByteArrayOutputStream();
int len = 0;
byte b = 0;
try {
while ((len = is.read()) != -1) {
//将数据异或一个数字2进行解密
b = (byte) (len ^ 2);
bos.write(b);
}
} catch (IOException e) {
e.printStackTrace();
} byte[] data = bos.toByteArray();
is.close();
bos.close(); return defineClass(name,data,0,data.length); } catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} return super.findClass(name);
} //获取要加载 的class文件名
private String getFileName(String name) {
// TODO Auto-generated method stub
int index = name.lastIndexOf('.');
if(index == -1){
return name+".classen";
}else{
return name.substring(index+1)+".classen";
}
}}

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;public class ClassLoaderTest { public static void main(String[] args) {
FileUtils.test("D:\\Test.class");
DeClassLoader diskLoader = new DeClassLoader("D:\\");
try {
//加载class文件
Class c = diskLoader.loadClass("com.yd.wmsc.util.Test"); if(c != null){
try {
Object obj = c.newInstance();
Method method = c.getDeclaredMethod("say",null);
//通过反射调用Test类的say方法
method.invoke(obj, null);
} catch (InstantiationException | IllegalAccessException
| NoSuchMethodException
| SecurityException |
IllegalArgumentException |
InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}}