使用文件通道将字节数据读入字节缓冲区并将字节数据转换为字符数据

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;
/**
 * 时 代 J a v a - N o w J a v a . c o m 提 供 
**/

import java.nio.ByteBuffer;

import java.nio.CharBuffer;

import java.nio.channels.FileChannel;

import java.nio.charset.Charset;

import java.nio.charset.CharsetDecoder;


public class Main {

  public static void main(String[] arguments) {

    try {

      // read byte data into a byte buffer
      /*
      时 代 J a v a 公 众 号 - nowjava.com 提 供
      */

      String data = "friends.dat";

      FileInputStream inData = new FileInputStream(data);

      FileChannel inChannel = inData.getChannel();

      long inSize = inChannel.size();

      ByteBuffer source = ByteBuffer.allocate((int) inSize);

      inChannel.read(source, 0);

      source.position(0);

      System.out.println("Original byte data:");

      for (int i = 0; source.remaining() > 0; i++) {

        System.out.print(source.get() + " ");

      }

      // convert byte data into character data

      source.position(0);

      Charset ascii = Charset.forName("US-ASCII");

      CharsetDecoder toAscii = ascii.newDecoder();

      CharBuffer destination = toAscii.decode(source);

      destination.position(0);

      System.out.println("\n\nNew character data:");

      for (int i = 0