Pureconfig and Java class library integration method
Pureconfig and Java class library integration method
PureConfig is a Scala library for reading the configuration file. It provides a simple and type secure way to load and parsing the configuration file.Although PureConfig is designed for Scala, it can also be integrated with the Java library.This article will introduce the integration method of using PureConfig in the Java project and provide some Java code examples.
1. Add PureConfig dependencies
To use PureConfig in the Java project, we need to add it to the dependencies of the project.Pureconfig can be added to the project through Maven or Gradle. The specific dependencies will be different according to the project construction tool.The following is an example of Maven:
<dependencies>
<dependency>
<groupId>com.github.pureconfig</groupId>
<artifactId>pureconfig</artifactId>
<version>0.17.0</version>
</dependency>
</dependencies>
2. Create configuration files
Before integrating the PureConfig and the Java library, you need to create a configuration file for PureConfig to read and analyze the configuration information.The configuration file can be a variety of formats, such as Hocon, JSON or Properties.The following is an example configuration file (`config.conf`):
hocon
app {
name = "MyApp"
version = "1.0"
timeout = 5000
}
3. Create configuration class
When using PureConfig in the Java project, a Java class corresponding to the configuration file structure needs to be created.The key names of this class and the configuration file must be consistent.The following is an example:
public class AppConfig {
private String name;
private String version;
private int timeout;
// Getters and setters
}
Fourth, analytical configuration
The use of PureConfig's parsing configuration file is very simple.Just use the method of `Configsource` and` load () `to load the configuration file into the configuration class.The following is an example code:
import com.github.pureconfig.ConfigSource;
import com.github.pureconfig.ConfigReader;
import com.github.pureconfig.PureConfig;
import com.github.pureconfig.error.ConfigReaderException;
public class Main {
public static void main(String[] args) {
ConfigSource configSource = ConfigSource.defaultApplication();
AppConfig appConfig = null;
try {
appConfig = PureConfig.loadConfigOrThrow(configSource, ConfigReader.failFast(AppConfig.class));
} catch (ConfigReaderException e) {
e.printStackTrace();
}
System.out.println(appConfig.getName());
System.out.println(appConfig.getVersion());
System.out.println(appConfig.getTimeout());
}
}
In the above code, `Configsource.defaultApplication ()` method is used to load the default configuration file (`application.conf`).If you use different configuration file names, you can use the method to specify the path with `configsource.file (" path/to/config.conf ").
In the method of `LoadConfigorthrow ()`, we loaded the contents of the configuration file to the `appconfig` class, and use the method of the configuration class with the method of` Configreader.failfast () `.
Five, run code
Save the above code to `main.java` and run the code to load the value in the configuration file into an instance of the` appconfig`.Then we can get the configuration value by calling the `Getxxx ()" method and use them.
Summarize:
This article introduces the integration method of using PureConfig in the Java project.By adding PureConfig's dependency items, creation configuration files, creating configuration classes, and using PureConfig to parse the configuration file, we can easily load the configuration information into the Java class.This can improve the configuration and flexibility of the application, and it can provide a type of security method to handle configuration.
