Unicode 转义字符未在 Spring application.yml 属性中解析

Question

I am trying to add a property value in application.yml file in Spring Boot which contains a trailing space. I'm retrieving the value using the @Value annotation. Leaving the space unescaped simply trims it and adding a Unicode escape character results in the following String Example\ being parsed by the application.

Initialising a String variable with \ directly in the code results in an expected space character.

Answer 1

Unicode escapes in strings are only accepted in double-quoted strings in YAML , so "Example\ " should work.

But simply quoting the string should also be sufficient: "Example " .

Answer 2

If you want to use Unicode escaped symbols - what worked for me is that you encode the entire string. Also, try to use '\ ' instead of '\ ' that symbol is known as "Non-breakable white space" (in HTML -  ) this definitely will not be trimmed out

Obviously, there are several sites on the internet that can do that for you, but I also wrote an Open-source library that has a util that can encode plain text strings into Unicode-escaped strings and vice-versa. I found it to be very useful also when debugging various encoding issues. In any case if you want to use it here how the code would look like:

result = "Example ";
result = StringUnicodeEncoderDecoder.encodeStringToUnicodeSequence(result);
System.out.println(result);
result = StringUnicodeEncoderDecoder.decodeUnicodeSequenceToString(result);
System.out.println(result);

The result would be:

\u0045\u0078\u0061\u006d\u0070\u006c\u0065\u0020
Example 

The library can be found at Maven Central or at Github It comes as maven artifact and with sources and javadoc

Here is javadoc for the class StringUnicodeEncoderDecoder