"Config" framework in the Java class library
The "Config" framework in the Java class library
Introduction:
In Java development, the behavior of reading and using configuration files is often required to configure the program.In order to simplify the reading and processing of the configuration file, the Java class library provides many convenient configuration frameworks, one of which is the "Config" framework.This tutorial will introduce how to use the "Config" framework in the Java Library to read and use the configuration file.
Step 1: Add dependency relationship
First of all, you need to add the "config" framework dependency in the project construction file (such as Maven's pom.xml).You can find the latest version of the "Config" framework in Maven central repository or other Maven repository.
The following is the maven dependency of an example:
<dependency>
<groupId>com.typesafe</groupId>
<artifactId>config</artifactId>
<version>1.4.1</version>
</dependency>
Step 2: Create configuration files
Next, you need to create a configuration file to save the configuration information of the program.For example, you can create a file called "Application.conf" and add the following content:
properties
app {
name = "My Application"
version = "1.0.0"
debug = true
server {
host = "localhost"
port = 8080
}
}
In this example configuration file, there is a top configuration node called "APP" and their respective configuration items.You can define your configuration structure according to actual needs.
Step 3: Read the configuration file
You can now use the "Config" framework to read the configuration items in the configuration file.The following is an example code that reads the configuration file using the "Config" framework:
import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;
public class AppConfig {
private static final Config config = ConfigFactory.load();
public static void main(String[] args) {
String appName = config.getString("app.name");
String appVersion = config.getString("app.version");
boolean debugMode = config.getBoolean("app.debug");
String serverHost = config.getString("app.server.host");
int serverPort = config.getInt("app.server.port");
System.out.println("Application Name: " + appName);
System.out.println("Application Version: " + appVersion);
System.out.println("Debug Mode: " + debugMode);
System.out.println("Server Host: " + serverHost);
System.out.println("Server Port: " + serverPort);
}
}
In this sample code, first use the "ConfigFactory.load ()" method to load configuration from the default configuration file.Then get the corresponding method to get the value of the configuration item.Here, different methods are used to obtain different types of values, such as getstring (), getBoolean (), and getint ().
Step 4: Running program
After completing the code, you can run the program to view the value of the configuration item.The program will read the configuration file and print the value of the configuration item to the console.
Through the above steps, you can learn how to use the "Config" framework in the Java class library to read and use the configuration file.This framework is very convenient, which can make the reading and processing of the configuration file easier and easy to manage.
