在FileReader和InputStreamReader之间进行选择 [英] Choosing between FileReader and InputStreamReader

问题描述

我有两种方法来读取文本文件在java中使用FileReader和其他文件InputStream

I have two methods to read Text File In java one using FileReader and Other File InputStream

FileReader fr=new FileReader("C:\\testq\\test.txt");
BufferedReader br=new BufferedReader(fr);
String s;
while((s=br.readLine())!=null){
    System.out.println("value are "+s);
}

和其他是

FileInputStream fstream = new FileInputStream("C:\\testnew\\out.text");
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
while ((strLine = br.readLine()) != null){
   System.out.println (strLine);
}

虽然两者都给我输出...我只是想知道哪个是最佳方式。

Though both give me output ...I just want to know which is the best way to do it.

推荐答案

我强烈建议使用 InputStreamReader 而不是 FileReader ，但明确指定了字符编码。这真的是使用 InputStreamReader 的最大好处（并且缺乏为 FileReader 指定编码的能力是一个主要漏洞在API，IMO）。

I would strongly advise using InputStreamReader instead of FileReader, but explicitly specifying the character encoding. That's really the biggest benefit of using InputStreamReader (and the lack of ability to specify an encoding for FileReader is a major hole in the API, IMO).

我还使用 DataInputStream 删除图层 - 只需通过 FileInputStream 到 InputStreamReader 构造函数。

I'd also remove the "layer" using DataInputStream - just pass the FileInputStream to the InputStreamReader constructor.

在Java 8之前

或者，考虑使用番石榴可以使这种事情更多更简单。例如：

Alternatively, consider using some of the many convenience methods in Guava which can make this sort of thing much simpler. For example:

File file = new File("C:\\testnew\\out.text");
List<String> lines = Files.readLines(file, Charsets.UTF_8));

来自Java 8

Java 8在 java.nio.files 中引入了一堆新的类和方法，其中许多默认（明智地）为UTF-8：

Java 8 introduced a bunch of new classes and methods in java.nio.files, many of which default (sensibly) to UTF-8:

Path path = Paths.get("C:\\testnew\\out.text");
List<String> lines = Files.readAllLines(path);

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