我建议使用BufferedReader来读取文本。扫描器隐藏IOException而BufferedReader立即抛出它。

Scanner用于解析来自流内容的令牌，而BufferedReader只读取流，不做任何特殊的解析。

事实上，您可以将BufferedReader传递给扫描器作为要解析的字符源。

BufferedReader和Scanner之间的区别是:

BufferedReader reads data, but Scanner parses data. You can only read String using BufferedReader, using Scanner you can read to different data types like int. BufferedReader is older than Scanner, it was added on JDK 1.1, while Scanner was added on JDK 5 release. The buffer size of BufferedReader is larger (8KB) as compared to Scanner's 1KB. BufferedReader is more suitable for reading files with long String, while Scanner is more suitable for reading small user input from command prompt. BufferedReader is synchronized, while Scanner is not, which means you cannot share Scanner among multiple threads. BufferedReader is faster than Scanner because it doesn't spend time on parsing. BufferedReader is a bit faster as compared to Scanner. BufferedReader is from java.io package, while Scanner is from java.util package.

在此基础上，我们可以选择我们的选择。

感谢阅读!

在当前最新的JDK 18发布/构建(b37)中，与BufferedReader(8192个字符)相比，Scanner的缓冲区更小(1024个字符)，但这已经足够了。

至于选择，如果你想解析文件，使用Scanner，如果你想逐行读取文件，使用BufferedReader。也请参阅前面链接的API文档的介绍文本。

解析=将给定的输入解释为标记(部分)。它可以直接返回特定的部分，如int，字符串，小数等。请参见Scanner类中的所有nextXxx()方法。 阅读=无声流媒体。它不断返回给你所有的字符，你反过来必须手动检查，如果你想匹配或组合一些有用的东西。但如果你不需要这样做，那么阅读就足够了。

BufferedReader可能会给你更好的性能(因为Scanner是基于InputStreamReader，查看源代码)。哎呀，对于从文件中读取数据，它使用nio。当我测试nio的性能与大文件的BufferedReader性能时，nio显示出更好的性能。 要从文件中读取数据，请尝试Apache Commons IO。

我建议使用BufferedReader来读取文本。扫描器隐藏IOException而BufferedReader立即抛出它。