@ConfigurationProperties

@ConfigurationProperties 是一个注解，用于将配置文件中的属性绑定到 Java 对象上。在 Spring Boot 中，通过 @ConfigurationProperties 注解将配置文件中的属性映射到 Java 对象上，可以非常方便地读取和修改配置文件中的属性。同时，Spring Boot 还提供了许多默认的配置属性，例如 server.port、spring.datasource.url 等。可以通过在 application.properties 或 application.yml 中设置这些属性来改变应用程序的行为。

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@configurationproperties

@ConfigurationProperties is a Spring Boot annotation that is used to bind the properties defined in the application.properties file or any other external properties file to a Java object. This annotation is used in combination with @EnableConfigurationProperties or @ConfigurationPropertiesScan to activate the binding process.

By using @ConfigurationProperties, we can define a Java class with properties that match the properties defined in the properties file. Spring Boot will then automatically bind the values from the properties file to the Java object, making it easy to access and use the values throughout the application.

For example, if we have the following properties defined in the application.properties file:

myapp.name=My Application
myapp.version=1.0

We can create a Java class with properties that match these properties as follows:

@ConfigurationProperties(prefix = "myapp")
public class MyAppProperties {
    private String name;
    private String version;

    // getters and setters
}

With this configuration, Spring Boot will automatically bind the values of myapp.name and myapp.version to the name and version properties of the MyAppProperties class.

We can then use this class throughout the application to access these values, as follows:

@Service
public class MyService {
    @Autowired
    private MyAppProperties myAppProperties;

    public String getAppInfo() {
        return myAppProperties.getName() + " " + myAppProperties.getVersion();
    }
}

This will return the value "My Application 1.0" when the getAppInfo method is called.

@ConfigurationProperties@ConfigurationProperties

@ConfigurationProperties 是 Spring Boot 中的一个注解，用于将配置文件中的属性值映射到 Java 对象中。

@ConfigurationProperties 可以作用在类上或者方法上，作用在类上时，需要搭配 @Component 或者 @Configuration 使用。

例如：

@Component
@ConfigurationProperties(prefix = "myconfig")
public class MyConfig {
    private String name;
    private String version;
    // getters and setters
}

这个例子中，MyConfig 类上使用了 @Component 注解，表示它是一个 Spring Bean，@ConfigurationProperties 注解的 prefix 属性指定了需要读取的配置文件前缀，Spring Boot 会自动将配置文件中以 myconfig 开头的属性值映射到 MyConfig 对象中。