Circe YAML framework configuration and usage guide
Circe is a powerful SCALA library that is used for serialization and derivativeization of JSON.It uses Yaml (Yaml Ain'T Markup Language) framework to achieve flexible configuration management.This article will introduce you to how to configure and use the Circe Yaml framework and provide some Java code examples.
First, you need to add Circe Yaml to your project.It can be achieved by adding the following dependencies in your construction tools (such as Maven or Gradle)::
<dependency>
<groupId>io.circe</groupId>
<artifactId>circe-yaml_2.13</artifactId>
<version>0.14.1</version>
</dependency>
Once you add Circe Yaml to the project, you can start using it.
## Configure Circe Yaml
You can use the `Config` class to read the yaml file and analyze its content.The following is an example yaml file:
yaml
# app.yaml
app:
name: MyApp
version: 1.0.0
author: John Doe
Now, let's write the Java code to read and analyze this YAML file:
import io.circe.config.syntax._
public class MyAppConfig {
private String name;
private String version;
private String author;
public MyAppConfig(String name, String version, String author) {
this.name = name;
this.version = version;
this.author = author;
}
public static void main(String[] args) {
Config config = ConfigFactory.load("app.yaml");
MyAppConfig myAppConfig = config.as[MyAppConfig]("app").getOrElse(throw new RuntimeException("Invalid configuration"))
System.out.println("Name: " + myAppConfig.getName());
System.out.println("Version: " + myAppConfig.getVersion());
System.out.println("Author: " + myAppConfig.getAuthor());
}
// Getter methods
public String getName() {
return name;
}
public String getVersion() {
return version;
}
public String getAuthor() {
return author;
}
}
In the above code, we first use the `ConfigFactory.load` method to load the YAML file.Then, we use the `Config.as [MyAppConfig]` to convert the configuration to the `MyAppConfig` object.If the configuration is invalid, we will throw an abnormality at running.
Finally, we can access the configuration attribute by calling the object method of the object.
This is the result of the output:
Name: MyApp
Version: 1.0.0
Author: John Doe
This is the basic process of configuration using the Circe Yaml framework.
In addition to the above examples, Circe Yaml also provides rich functions, including custom type parser, essential field verification and type security.You can refer to the official documentation of Circe Yaml to obtain more details and example code.
I hope this article can help you quickly use the Circe YAML framework for configuration and use!
