ClassLoader的defineClass方法中的形参name的含义 - 黑马程序员技术交流社区

<p>package com.itheima.day5;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.File;
public class CustomClassLoader extends ClassLoader{
/**
* @param args;
*/
public static void main(String[] args)throws Exception {
// TODO Auto-generated method stub
//args[0]作为源路径,args[1]作为目的路径
//我把加密和解密在同一个main中执行,在运行加密后注释掉防止在删除bin下的EncryptClass后,由于找不到文件会报
//FileNotFoundException
/* File file=new File(args[0]);
FileInputStream fis=new FileInputStream(file);
FileOutputStream fos=new FileOutputStream(args[1]+"\\\\"+file.getName());
encryptClass(fis,fos);
fis.close();
fos.close();
*/
Class cls=new CustomClassLoader("myEncryptClass").findClass("EncryptClass");
System.out.println(cls.newInstance().toString());
}
//简单加密
public static void encryptClass(InputStream in,OutputStream os)throws IOException{
int aByte=0;
while((aByte=in.read())!=-1){
os.write(aByte^0xff);//最简单的加密->.class中的每个字节^255
}
}
private String classDir;
public CustomClassLoader(String classDir) {
super();
this.classDir = classDir;
}
@Override</p><p>public Class<?> findClass(String name)throws ClassNotFoundException{
String path=classDir+"\\"+name+".class";
File file=new File(path);
FileInputStream fis=null;
byte[] byteArr=new byte[1024];
int aByte=0;
int pointer=0;
try{
fis=new FileInputStream(file.getAbsolutePath());
while((aByte=fis.read())!=-1)
byteArr[pointer++]=(byte)(aByte ^ 255);//解密
}
catch(Exception e){
e.printStackTrace();
}
finally{
if(fis!=null)
try{
fis.close();
}
catch(Exception e){
e.printStackTrace();
}
}
return defineClass(name,byteArr,0,pointer);
}
}
</p>

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