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NIO-四种IO模式 |

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同步 阻塞

同步 非阻塞

异步 阻塞

异步 非阻塞

select -> poll -> epoll

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NIO-select-模块函数 |

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select(input,output,error,time)

* 创建select实例对象

* 参数

input :

output :

error :

time :隔多少时间轮询一次