Spring Boot reads properties configuration files.

2 years ago
Isabella Edwards
2 minutes

In Spring Boot, you can use the @ConfigurationProperties annotation to read properties configuration files.

Firstly, you need to add the following dependencies in the pom.xml file:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <optional>true</optional>
</dependency>

Then, in the configuration class, use the @ConfigurationProperties annotation and specify the prefix of the properties file, as shown below:

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix = "myconfig")
public class MyConfig {
    private String name;
    private String age;

    // getter and setter methods
}

In the configuration file, use “myconfig” as a prefix to define properties, as shown below:

myconfig.name=John
myconfig.age=25

Finally, in other classes you can inject the configuration class using the @Autowired annotation and make use of its properties, as shown below:

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class MyService {
    @Autowired
    private MyConfig myConfig;

    public void printConfig() {
        System.out.println("Name: " + myConfig.getName());
        System.out.println("Age: " + myConfig.getAge());
    }
}

In this way, the property values in the configuration file will be automatically injected into the MyConfig class and can be used in other classes.

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