Java NIO保存数据到文件

原理流程图

源码demo

    public static void main(String[] args) throws Exception {
        String str="你好，chen";
        //创建Buffer
        ByteBuffer buffer = ByteBuffer.allocate(1024);
        //将str放入Buffer
        buffer.put(str.getBytes());
        //反转读写模式
        buffer.flip();
        //创建文件
        FileOutputStream outputStream = new FileOutputStream("d:\\test\\write.txt");
        //创建Channel，把文件放入通道
        FileChannel fileChannel = outputStream.getChannel();
        //把Buffer内容放入Channel
        fileChannel.write(buffer);
        fileChannel.close();
        outputStream.close();
        //清除缓冲区
        buffer.clear();
        System.out.println("结束");
    }

debug代码，看到OutputStream内置了Channel

NIO读取文件数据并输出

https://blog.csdn.net/weixin_44371237/article/details/122322008