从 Java 输入流中读取下一个字符(完整的 Unicode 代码点) [英] Read next character (full unicode code point) from Java input stream

问题描述

我需要逐个字符地解析 UTF-8 输入(来自文本文件)(按字符我的意思是完整的 UTF-8 字符(UTF-8 代码点)，而不是 Java 的字符).

I need to parse UTF-8 input (from a text file) character by character (and by character I mean full UTF-8 character (UTF-8 code point), not Java's char).

我应该使用什么方法?

推荐答案

从 Java 8 开始就有 CharSequence.codePoints()

Since Java 8 there's CharSequence.codePoints()

例如:

// if you want to work line by line, use Files.readAllLines()
// if you use Guava, there's also Guava's Files.toString() for reading the whole file into a String
byte[] bytes = Files.readAllBytes(Paths.get("test.txt"));
String text = new String(bytes, StandardCharsets.UTF_8);

IntStream codePoints = text.codePoints();

// do something with the code points
codePoints.forEach(codePoint -> System.out.println(codePoint));

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