app.msg=Hello World
app.version=1.0.0

@Value("${app.msg}")
private String msg;

@Value("${app.version}")
private String version;

@Autowired
private Environment environment;

// ---

environment.getProperty("app.msg")
environment.getProperty("app.version")

@Configuration
@ConfigurationProperties("app")
public class AppConfig {

    private String msg;
    private String version;

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }
}

// ---

@Autowired
private AppConfig appConfig;