/**
*nio 读取文件
*
*/

import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.io.IOException;

import java.nio.charset.CharsetDecoder;
import java.nio.charset.Charset;


public class NioTest {
	
	public void method1(){
 RandomAccessFile aFile = null;
 try{
 aFile = new RandomAccessFile("./test","rw");
 FileChannel fileChannel = aFile.getChannel();
 ByteBuffer buf = ByteBuffer.allocate(1024);
 CharBuffer charBuffer = CharBuffer.allocate(1024);
 
 			Charset chartset = Charset.forName("UTF-8");
 			CharsetDecoder decoder = chartset.newDecoder();
 			
 			
 int bytesRead = fileChannel.read(buf);
 System.out.println("byteBuffer 长度为 "+bytesRead);
 
 while(bytesRead != -1)
 {
 buf.flip();
 decoder.decode(buf,charBuffer,false);
 System.out.println("charbuffer 长度 "+charBuffer.length());
 System.out.println("charBuffer 内容 "+charBuffer.toString());
 System.out.println("charBuffer.hasRemaining()"+charBuffer.hasRemaining());
 while(charBuffer.hasRemaining())
 {
 	
 System.out.print((char)charBuffer.get());
 }
 				charBuffer.compact();
 buf.compact();
 bytesRead = fileChannel.read(buf);
 }
 }catch (IOException e){
 e.printStackTrace();
 }finally{
 try{
 if(aFile != null){
 aFile.close();
 }
 }catch (IOException e){
 e.printStackTrace();
 }
 }
 }
 
 public static void main(String[] args){
 	new NioTest().method1();
 }
	
	
}