How Can I Access Application Properties in My Spring Boot Application?

Accessing Application Properties in Spring Boot

Need to retrieve values defined in the application.properties file within your Spring Boot application? Here's how:

@Value Annotation

The @Value annotation allows you to inject property values into your Spring beans. For example, to access userBucket.path:

@Value("${userBucket.path}")
private String userBucketPath;

Externalized Configuration

Spring Boot provides a comprehensive Externalized Configuration mechanism that enables you to access property values from various sources, including application.properties.

@ConfigurationProperties

Use the @ConfigurationProperties annotation to map a bean to a property source. This allows you to bind property values directly to fields within your bean. For instance:

@ConfigurationProperties(prefix = "userBucket")
public class BucketProperties {
    private String path;

    // ... getters and setters
}

@PropertySource

Load properties from custom sources using @PropertySource:

@PropertySource("classpath:my-custom-properties.properties")
public class MyProperties {
    @Value("${my-custom-property}")
    private String customProperty;
}

@Environment

The @Environment interface provides access to the current environment and its properties:

Environment env = SpringApplication.getEnvironment();
String customProperty = env.getProperty("my-custom-property");

For further details and configuration options, refer to the Spring Boot documentation on Externalized Configuration: https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-external-config.html

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