Detailed explanation of the configuration information of @ConfigurationProperties in Springboot

ConfigurationProperties easily manages application configuration information

What is @ConfigurationProperties

@ConfigurationPropertiesThe purpose of annotation is to inject property values ​​from external configuration files into a Java Bean.

The advantage of this is that it can easily bind the attribute values ​​in the configuration file to Java Bean objects, making the reading and management of configuration attributes more convenient.

pass@ConfigurationProperties annotation, we can easily map attribute values ​​in configuration files into a POJO (Plain Old Java Object) class in Spring Boot application, thereby achieving type-safe attribute access.

This way, instead of manually writing code to read properties in the configuration file, we can inject property values ​​in the configuration file directly into a predefined Java Bean object and then use these property values ​​directly in the code.

Case implementation

Suppose there is a file that contains the following properties:

=John
=30

We can create a UserProperties class and map these property values ​​into the class using the @ConfigurationProperties annotation:

import ;
import ;

@Data
@Component
@ConfigurationProperties(prefix = "")
public class UserProperties {
    private String name;
    private int age;
}

Then, we can inject the UserProperties object directly into the code and access the property values ​​in it:

@Service
public class UserService {
    private final UserProperties userProperties;

    public UserService(UserProperties userProperties) {
         = userProperties;
    }

    public void displayUserInfo() {
        ("User Name: " + ());
        ("User Age: " + ());
    }
}

By using the @ConfigurationProperties annotation, we can easily inject property values ​​from external configuration files into UserProperties objects without hard-coded these property values ​​in the code, which can improve the maintainability and flexibility of the code.

Summarize

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