Detailed explanation of the international and localization support of the Circe YAML framework in the Java class library
Circe is a popular Java library for analysis and generating JSON data.However, Circe is not limited to JSON data, it also provides support for YAML format.YAML is a simple data serialization format, which is often used in configuration files and language internationalized files.
It is very simple to use Circe for internationalization and localization in the Java library.The following will introduce these functions in detail how to use Circe and provide some Java code examples.
## Circe YAML framework introduction and configuration
First, we need to add the Circe Yaml framework to our Java project.It can be introduced through building tools such as Maven or Gradle.The following is an example configuration of the Maven project:
<dependency>
<groupId>io.circe</groupId>
<artifactId>circe-yaml_2.13</artifactId>
<version>0.15.0</version>
</dependency>
After successfully introducing the Circe YAML framework, we need to create a language internationalized file in YAML format to store localized string in different languages.
## Create YAML Language International File
First of all, we create a file called `Messages.yml` and put it in the resource directory of the project.This file will contain localized string in different languages.The following is an example of a simple `messages.yml` file:
yaml
en:
greeting: Hello!
zh:
Greeting: Hello!
In the above example, we provide localized string of English (EN) and Chinese (ZH) language.Among them, `Greeting` is a general greeting.
## Use Circe YAML framework to load the localized string
Next, we will load and analyze the localized string in the Circe YAML framework to load and analyze the localized string in the `messages.yml` file.The following is a simple Java code example:
import io.circe.yaml.parser.YamlParser;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
public class LocalizationExample {
public static void main(String[] args) {
// Load and analyze the yaml file
Map<String, Object> localizedStrings = loadYamlFile("messages.yml");
// Output localized string in different languages
System.out.println("English: " + getLocalizedString(localizedStrings, "en", "greeting"));
System.out.println("Chinese: " + getLocalizedString(localizedStrings, "zh", "greeting"));
}
private static Map<String, Object> loadYamlFile(String filePath) {
try (FileInputStream fis = new FileInputStream(filePath)) {
// Use the Circe YAML framework to parse the yaml file
return YamlParser.DEFAULT.parseMap(fis).right().get().toJavaMap();
} catch (IOException e) {
e.printStackTrace();
}
return new HashMap<>();
}
private static String getLocalizedString(Map<String, Object> localizedStrings, String lang, String key) {
Map<String, Object> langStrings = (Map<String, Object>) localizedStrings.get(lang);
return (String) langStrings.get(key);
}
}
In the above example, we first call the `Loadyamlfile` method to load and analyze the` messages.yml` file, and then use the `GetLocalizedStringstring` method to get the localized string of different languages.Finally, in the main method, we use English and Chinese to output greetings separately.
Make sure to put the `Messages.yml` file in the right position and provide the corresponding international string.
Run the above code example, the output result should be:
English: Hello!
Chinese: Hello!
By using the Circe YAML framework, we can easily realize the international and localized support in the Java library.In actual projects, these functions can be expanded and customized as needed to meet specific international needs.
