NIO入门:https://www.ibm.com/developerworks/cn/education/java/j-nio/index.html NIO浅析:https://tech.meituan.com/nio.html 网络编程释疑之:同步,异步,阻塞,非阻塞:http://yaocoder.blog.51cto.com/2668309/1308899 socket阻塞与非阻塞,同步与异步、I/O模型:http://blog.youkuaiyun.com/hguisu/article/details/7453390