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标题:
类加载器解密流程求大神解
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作者:
高波
时间:
2013-12-31 20:46
标题:
类加载器解密流程求大神解
package cn.itcast.day2;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
public class MyClassLoader extends ClassLoader{
/**
* @param args
*/
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
String srcPath = args[0];
String destDir = args[1];
FileInputStream fis = new FileInputStream(srcPath);
String destFileName = srcPath.substring(srcPath.lastIndexOf('\\')+1);
String destPath = destDir + "\\" + destFileName;
FileOutputStream fos = new FileOutputStream(destPath);
cypher(fis,fos);
fis.close();
fos.close();
}
private static void cypher(InputStream ips ,OutputStream ops) throws Exception{
int b = -1;
while((b=ips.read())!=-1){
ops.write(b ^ 0xff);
}
}
private String classDir;
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
// TODO Auto-generated method stub
String classFileName = classDir + "\\" + name.substring(name.lastIndexOf('.')+1) + ".class";
try {
FileInputStream fis = new FileInputStream(classFileName);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
cypher(fis,bos);
fis.close();
System.out.println("aaa");
byte[] bytes = bos.toByteArray();
return defineClass(bytes, 0, bytes.length);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
public MyClassLoader(){
}
public MyClassLoader(String classDir){
this.classDir = classDir;
}
}
复制代码
张老师的自定义类加载器,在利用自定义类加载器加载类文件时,找到的是已经加密的文件,具体是怎样用自定义类加载器解密的,流程是怎样的?求大神讲解,已晕
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