Java tutorial
//package com.java2s; //License from project: Apache License import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.nio.MappedByteBuffer; import java.nio.channels.FileChannel; public class Main { public static ByteBuffer mapFile(File f, long offset, ByteOrder byteOrder) throws IOException { FileInputStream dataFile = new FileInputStream(f); try { FileChannel fc = dataFile.getChannel(); MappedByteBuffer buffer = fc.map(FileChannel.MapMode.READ_ONLY, offset, f.length() - offset); buffer.order(byteOrder); return buffer; } finally { dataFile.close(); // this *also* closes the associated channel, fc } } }