5、NIO--通道的数据传输

@Test
    public void test4() throws IOException{
                FileInputStream fis = new FileInputStream("d:\\a.jpg");
        FileOutputStream fos = new FileOutputStream("d:\\b.jpg");
        
        //获取通道
        FileChannel inChannel=fis.getChannel();
        FileChannel outChannel = fos.getChannel();
        
        //指定大小的缓冲区
        ByteBuffer buf = ByteBuffer.allocate(2048);
        
        //将通道中的数据存入缓冲区
        while(inChannel.read(buf) != -1){
            //切换成读取数据的模式
            buf.flip();
            
            //将缓冲区的数据写入通道
            outChannel.write(buf);
            
            //清空缓冲区
            buf.clear();
            
        }
        
        outChannel.close();
        inChannel.close();
        fos.close();
        fis.close();
        
    }