Javaで帯域制限かけながらI/Oする

gistfile1.java

byte[] buff = new byte[length];
int i;
while((i = in.read(buff, 0, length)) != -1){
	long start = System.currentTimeMillis();
	out.write(buff, 0, i);
	long diff = System.currentTimeMillis() - start;
	Thread.sleep(1000 - diff);
}