浅析Java NIO 直接缓冲区和非直接缓冲区

//使用直接缓冲区API进行一个700多M的文件进行拷贝
public static void testDirect(){
        try {
            long start = System.currentTimeMillis();
            FileChannel srcFileChannel = FileChannel.open(Paths.get("C:\\Users\\Yehaocong\\Desktop\\test\\95462017-1-64.flv"), StandardOpenOption.READ);
            FileChannel destFileChannel = FileChannel.open(Paths.get("C:\\Users\\Yehaocong\\Desktop\\test\\95462017-1-64-cp1.flv"),StandardOpenOption.CREATE,
                    StandardOpenOption.WRITE,StandardOpenOption.READ);
            MappedByteBuffer srcByteBuffer = srcFileChannel.map(FileChannel.MapMode.READ_ONLY,0,srcFileChannel.size());
            MappedByteBuffer descByteBuffer = destFileChannel.map(FileChannel.MapMode.READ_WRITE,0,srcFileChannel.size());
            descByteBuffer.put(srcByteBuffer);
            srcFileChannel.close();
            destFileChannel.close();
            System.out.println("直接缓冲区耗时：" + (System.currentTimeMillis()-start));
      } catch (IOException e) {
            e.printStackTrace();
        }
    }

public static void testSimpleIO(){
        try {
            long start = System.currentTimeMillis();
            FileChannel srcFileChannel = FileChannel.open(Paths.get("C:\\Users\\Yehaocong\\Desktop\\test\\95462017-1-64.flv"), StandardOpenOption.READ);
            FileChannel destFileChannel = FileChannel.open(Paths.get("C:\\Users\\Yehaocong\\Desktop\\test\\95462017-1-64-cp.flv"),StandardOpenOption.CREATE,
                    StandardOpenOption.WRITE,StandardOpenOption.READ);
            ByteBuffer byteBuffer = ByteBuffer.allocate((int) srcFileChannel.size());
            while (srcFileChannel.read(byteBuffer)!=-1){
                byteBuffer.flip();
                destFileChannel.write(byteBuffer);
                byteBuffer.clear();
            }


            srcFileChannel.close();
            destFileChannel.close();

            System.out.println("非缓冲区耗时：" + (System.currentTimeMillis()-start));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }