java - 如何在java属性文件中保存和读取Latin1字符

Question

我正在尝试将 Latin1 字符“ÀßÖ”保存在 test.properties 文件中。但它存储为“\u00C0\u00DF\u00D6”。但我期望存储确切的值。尽可能提供帮助。

Answer 1

您可以使用重载的 store(Writer,String) 使用Writer进行存储方法，但你不应该。

保存/加载的标准方法是通过OutputStream/InputStream。 store(OutputStream,String) 的文档:

This method outputs the comments, properties keys and values in thesame format as specified in store(Writer), with the followingdifferences:

• The stream is written using the ISO 8859-1 character encoding.
• Characters not in Latin-1 in the comments are written as \uxxxx for their appropriate unicode hexadecimal value xxxx.
• Characters less than \u0020 and characters greater than \u007E in property keys or values are written as \uxxxx for the appropriatehexadecimal value xxxx.

如果您使用其他机制写入数据，则任何期望标准形式的应用程序都将失败，如以下代码所示:

Path file = Paths.get("tmp.properties");
Properties write = new Properties();
write.put("key", "\u00C0\u00DF\u00D6");
try (Writer writer = Files.newBufferedWriter(file, StandardCharsets.UTF_8)) {
  write.store(writer, "demo");
}
Properties read = new Properties();
try (InputStream in = Files.newInputStream(file)) {
  read.load(in);
}
if (!write.get("key").equals(read.get("key"))) {
  throw new IOException("expected: " + write.get("key") + "; got: "
      + read.get("key"));
}

如果转义有问题，请考虑使用替代格式，例如 JSON - JSON mandates Unicode .