Spring Boot @ConfigurationProperties 不从环境中检索属性

使用Spring Boot的@ConfigurationProperties注解可以方便地将属性值绑定到Java类中。这个注解允许我们在应用程序中定义自己的配置属性，并将其与特定的类关联起来。默认情况下，Spring Boot会尝试从环境中检索属性值，但是有时候我们希望不从环境中检索属性值，而是使用预定义的默认值。本文将介绍如何使用@ConfigurationProperties注解来实现这一点，并通过示例代码来说明。

@Configuration
@EnableConfigurationProperties
@ConfigurationProperties(prefix = "myapp")
public class MyAppProperties {
    private String name;
    private String version;
    private String description;
    // getters and setters
}

@Configuration
@EnableConfigurationProperties
@ConfigurationProperties(prefix = "myapp", ignoreUnknownFields = true)
public class MyAppProperties {
    // ...
}

java
@Configuration
@EnableConfigurationProperties
@ConfigurationProperties(prefix = "myapp", ignoreUnknownFields = true)
public class MyAppProperties {
    private String name;
    private String version;
    private String description;
    // getters and setters
}

java
@RestController
public class MyAppController {
    private final MyAppProperties appProperties;
    public MyAppController(MyAppProperties appProperties) {
        this.appProperties = appProperties;
    }
    @GetMapping("/info")
    public String getInfo() {
        return "Name: " + appProperties.getName() + 
               "\nVersion: " + appProperties.getVersion() + 
               "\nDescription: " + appProperties.getDescription();
    }
}