readfile.java

疯狂Java讲义_源码(含Java设计模式CHM

import java.io.*;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
public class ReadFile
{
	public static void main(String[] args)
	{
		FileChannel fcin = null;
		try
		{
			//创建文件输入流
			FileInputStream fis = new FileInputStream("ReadFile.java");
			//创建一个FileChannel
			fcin = fis.getChannel();
			//定义一个ByteBuffer对象，用于重复取水
			ByteBuffer bbuff = ByteBuffer.allocate(1024);
			//将FileChannel中数据放入ByteBuffer中
			while( fcin.read(bbuff) != -1 )
			{
				//锁定Buffer的空白区
				bbuff.flip();         
				//创建Charset对象
				Charset charset = Charset.forName("gb2312");
				//创建解码器(CharsetDecoder)对象
				CharsetDecoder decoder = charset.newDecoder();
				//将ByteBuffer的内容转码
				CharBuffer cbuff = decoder.decode(bbuff);
				System.out.println(cbuff);
				//将Buffer初始化，为下一次取数据做准备
				bbuff.clear();
			}
		}
		catch (IOException ex)
		{
			ex.printStackTrace();
		}
		finally
		{
			try
			{
				if (fcin != null)
					fcin.close();
			}
			catch (IOException ex)
			{
				ex.printStackTrace();
			}
		}
	}
}