springboot custom attributes and loading @value example detailed explanation

When using Spring Boot, you usually need to customize some properties, which can be defined directly as follows. In the src/main/resources/ configuration file:

=8089
 = my spring boot
 = av

Then load the corresponding configuration attributes through the @Value("${attribute name}") annotation. The specific code is as follows:

package ;
import ;
import ;
import ;
/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2024/1/13 20:35
 */
@Component
@Data
public class BookProperties
{
    @Value("${}")
    private String bookName;
    @Value("${}")
    private String author;
}

Finally, verify that the BookProperties attribute has loaded the configuration according to the configuration file through unit tests:

package ;
import ;
import ;
import ;
import ;
import .;
import ;
/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2024/1/13 20:37
 */
@SpringBootTest
@RunWith()
public class MyTest
{
    @Resource
    private BookProperties bookProperties;
    @Test
    public void test(){
        ("book name:" + ());
        ("book author:" + ());
    }
}

However, we do not recommend this method, and the following is a more elegant implementation method. First, we introduce the configuration dependencies provided by Spring Boot:

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

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="/POM/4.0.0" xmlns:xsi="http:///2001/XMLSchema-instance"
         xsi:schemaLocation="/POM/4.0.0 /xsd/maven-4.0.">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId></groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId></groupId>
    <artifactId>demo9</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo9</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <>1.8</>
    </properties>
    <dependencies>
        <dependency>
            <groupId></groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId></groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId></groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId></groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId></groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId></groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

Use the @ConfigurationProperties annotation for encoding, and modify BookProperties to:

package ;
import ;
import ;
/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2024/1/13 20:39
 */
@Data
@ConfigurationProperties(prefix = "")
public class OtherProperties
{
    private String name;
    private String author;
}

@ConfigurationProperties(prefix=""): Prefix in the configuration property. Attributes in the class do not need to be injected using @value.

package ;
import ;
import ;
import ;
@SpringBootApplication
@EnableConfigurationProperties({})
public class Demo9Application
{
    public static void main(String[] args)
    {
        (, args);
    }
}

Finally, add @EnableConfigurationProperties({}) to the startup class.

This is the article about springboot custom properties and loading @value. For more related springboot loading @value, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!