Java NIO Tutorial

最新推荐文章于 2025-05-30 19:56:23 发布

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本文介绍Java NIO（New IO）作为一种替代标准Java IO API的方法，从Java 1.4开始引入。NIO提供了通道和缓冲区的概念，允许进行非阻塞I/O操作，并通过选择器来监控多个通道上的事件，使单个线程可以同时处理多个连接。

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原文地址

Jakob Jenkov
Last update: 2014-06-25

Java NIO (New IO) is an alternative IO API for Java (from Java 1.4), meaning alternative to the standardJava IO and Java Networking API's. Java NIO offers a different way of working with IO than the standard IO API's.

Java NIO: Channels and Buffers

In the standard IO API you work with byte streams and character streams. In NIO you work with channels and buffers. Data is always read from a channel into a buffer, or written from a buffer to a channel.

Java NIO: Non-blocking IO

Java NIO enables you to do non-blocking IO. For instance, a thread can ask a channel to read data into a buffer. While the channel reads data into the buffer, the thread can do something else. Once data is read into the buffer, the thread can then continue processing it. The same is true for writing data to channels.

Java NIO: Selectors

Java NIO contains the concept of "selectors". A selector is an object that can monitor multiple channels for events (like: connection opened, data arrived etc.). Thus, a single thread can monitor multiple channels for data.

How all this works is explained in more detail in the next text in this series - the Java NIO overview.

Next: Java NIO Overview