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java8_juc_nio

io过程:

  1. 应用程序 发送请求给 内核
  2. 内核将数据复制到用户空间
  • 在过程1中,如果内核在等待数据的过程中,我们的程序也阻塞在这个阶段,就称其为阻塞式IO,即BIO
  • 在过程1中,如果内核在等待数据的过程中,未等待数据准备完全就直接返回给了应用程序,即为非阻塞IO
  • 在过程2中,内核将数据复制到用户空间,即内核数据写入我们应用程序,如果是同步的则为同步IO,如果此过程是异步的,则为异步IO.

疯狂Java讲义中,将这两步分为:1.程序发出IO请求 2.完成实际的IO操作

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