Mega Code Archive
Self ClassLoader
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/*
* @(#)SelfClassLoader.java 2010-4-18
*
* Copyright 5jxiang . All rights reserved.
*/
//package com.jz.util;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.WritableByteChannel;
/**
* <p>
* <a href="SelfClassLoader.java.html"><i>View Source</i></a>
* </p>
*
* @author 5jxiang
* @version $Id$
*/
public class SelfClassLoader extends ClassLoader {
protected Class findClass(String name) throws ClassNotFoundException {
byte[] bytes = loadClassBytes(name);
Class theClass = defineClass(name, bytes, 0, bytes.length);
if (theClass == null)
throw new ClassFormatError();
return theClass;
}
private byte[] loadClassBytes(String className) throws
ClassNotFoundException {
try {
String classFile = getClassFile(className);
FileInputStream fis = new FileInputStream(classFile);
FileChannel fileC = fis.getChannel();
ByteArrayOutputStream baos = new
ByteArrayOutputStream();
WritableByteChannel outC = Channels.newChannel(baos);
ByteBuffer buffer = ByteBuffer.allocate(1024);
while (true) {
int i = fileC.read(buffer);
if (i == 0 || i == -1) {
break;
}
buffer.flip();
outC.write(buffer);
buffer.clear();
}
fis.close();
return baos.toByteArray();
} catch (IOException fnfe) {
throw new ClassNotFoundException(className);
}
}
private String getClassFile(String name){
StringBuffer sb = new StringBuffer(SelfClassLoader.class.getResource("/").getPath());
name = name.replace('.', File.separator.charAt(0)) + ".class";
sb.append(File.separator + name);
return sb.toString();
}
}
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