Copiar arquivo de dentro de um .jar

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.channels.FileChannel;

public class testcopiar {

	public static void main(String[] args) {
		new testcopiar().copiar("/imagen/brasrepublica.jpg","C:/imagem/brasrepublica.jpg");
	}
	
	private void copiar(String origem, String destino){
		try {
			File srcFile = new File(this.getClass().getResource(origem).toURI());
			File tgtFile = new File(destino);
			
			FileChannel sourceChannel = new FileInputStream(srcFile).getChannel();
			FileChannel targetChannel = new FileOutputStream(tgtFile).getChannel();
			sourceChannel.transferTo(0, sourceChannel.size(), targetChannel);
			sourceChannel.close();
			targetChannel.close();
		
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}