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import java.io.File;

import java.io.IOException;
/**来自 
 NowJava.com - 时代Java**/

import java.io.RandomAccessFile;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;


public class Main {


  public void main(String[] argv) {

    try {

      File file = new File("filename");


      // Create a read-only memory-mapped file

      FileChannel roChannel = new RandomAccessFile(file, "r").getChannel();

      ByteBuffer roBuf = roChannel.map(FileChannel.MapMode.READ_ONLY, 0,

          (