https://www.javatpoint.com/java-nio-vs-input-output
https://howtodoinjava.com/java/io/difference-between-standard-io-and-nio/
http://tutorials.jenkov.com/java-nio/non-blocking-server.html
https://dzone.com/articles/java-io-and-nio
http://tutorials.jenkov.com/java-nio/buffers.html
在这里插入图片描述