NIO入门03

package com.sico.pck01_nio;

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

import org.junit.Test;

/**

• @author Administrator

• 分散读取(Scatter):将通道中的数据分散到各个缓冲区中去(按照顺序填充)；聚集写入(Gather)：将各个缓冲区中的数据聚集到通道中
  */
  public class Nio03 {

  @Test
  public void fun01() throws IOException{

   //1、分散讀取
   RandomAccessFile raf01 = new RandomAccessFile("./file/1.txt", "rw");
   
   FileChannel channel1 = raf01.getChannel();
   
   ByteBuffer buf1 = ByteBuffer.allocate(100);
   ByteBuffer buf2 = ByteBuffer.allocate(1024);
   
   ByteBuffer[] bufArr={buf1,buf2};
   
   channel1.read(bufArr);
   
   for(ByteBuffer ele:bufArr){
   	ele.flip();//切換模式
   }
   
   System.out.println(new String(bufArr[0].array(),0,bufArr[0].limit()));
   System.out.println();
   System.out.println(new String(bufArr[1].array(),0,bufArr[1].limit()));
   
   System.out.println("***********************************************");
   
   //2、聚集寫入
   RandomAccessFile raf2=new RandomAccessFile("./file/2.txt", "rw");
   FileChannel channel2 = raf2.getChannel();
   channel2.write(bufArr);
   
   if(raf01!=null){
   	raf01.close();
   }
   if(channel1!=null){
   	channel1.close();
   }
  

  }

}