Java 缓冲阅读器和文件阅读器和扫描器类之间的区别
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Difference between buffered reader and file reader and scanner class
提问by Charbel
Can anyone explain me the difference between the class BufferedReader, FileReaderand Scanner? and which one to use when I want to read a text file?
任何人都可以向我解释类之间的区别BufferedReader，FileReader和Scanner？当我想阅读文本文件时使用哪一个？
采纳答案by Jon Skeet
Well:
好：
FileReaderis just aReaderwhich reads a file, using the platform-default encoding (urgh)BufferedReaderis a wrapper around anotherReader, adding buffering and the ability to read a line at a timeScannerreads from a variety of different sources, but is typically used for interactive input. Personally I find the API ofScannerto be pretty painful and obscure.
FileReader只是一个Reader读取文件，使用平台默认编码（urgh）BufferedReader是另一个的包装器Reader，添加缓冲和一次读取一行的能力Scanner从各种不同的来源读取，但通常用于交互式输入。我个人认为 的 APIScanner非常痛苦和晦涩。
To read a text file, I would suggest using a FileInputStreamwrapped in an InputStreamReader(so you can specify the encoding) and then wrapped in a BufferedReaderfor buffering and the ability to read a line at a time.
要读取文本文件，我建议使用FileInputStream包装在 an 中InputStreamReader（以便您可以指定编码），然后包装在 a 中BufferedReader用于缓冲和一次读取一行的能力。
Alternatively, you could use a third-party library which makes it simpler, such as Guava:
或者，您可以使用第三方库使其更简单，例如Guava：
File file = new File("foo.txt");
List<String> lines = Files.readLines(file, Charsets.UTF_8);
Or if you're using Java 7, it's already available for you in java.nio.file.Files:
或者，如果您使用的是 Java 7，它已经可以在以下位置使用java.nio.file.Files：
Path path = FileSystems.getDefault().getPath("foo.txt");
List<String> lines = Files.readAllLines(path, StandardCharsets.UTF_8);
回答by Saurabh Sharma
And as per your question for reading a text file you should use BufferedReaderbecause Scannerhides IOExceptionwhile BufferedReaderthrowsit immediately.
根据您阅读文本文件的问题，您应该使用，BufferedReader因为在立即抛出时Scanner隐藏IOException。BufferedReader
BufferedReaderis synchronizedand Scanneris not.
BufferedReader是同步的，Scanner不是。
Scanneris used for parsing tokens from the contents of the stream.
Scanner用于从流的内容中解析标记。
BufferedReaderjust reads the stream.
BufferedReader只读取流。
For more info follow the link (http://en.allexperts.com/q/Java-1046/2009/2/Difference-Scanner-Method-Buffered.htm)
有关更多信息，请点击链接（http://en.allexperts.com/q/Java-1046/2009/2/Difference-Scanner-Method-Buffered.htm）
