NIO文件读取

已转移
public static void main( String[] args ) throws Exception
    {
        RandomAccessFile aFile = new RandomAccessFile("file1.txt", "rw");
        FileChannel inChannel = aFile.getChannel();
        ByteBuffer buf = ByteBuffer.allocate(48);//分配空间
        //读取指定字节到buf中，将pos设为bytesRead(读取的字节数)，limit设为分配空间48
        int bytesRead = inChannel.read(buf);
        while (bytesRead != -1) {
            buf.flip();//转换为读模式，将limit设为pos，pos设为0，准备从buf取数据
            while(buf.hasRemaining()){//判断buf中pos是否小于limit,
                System.out.print((char) buf.get());//获取一个字节，pos+1
            }
            buf.clear();//清空buf，将limit设为分配空间48，pos设为0
            bytesRead = inChannel.read(buf);//再次读取
        }
        aFile.close();
    }