构造函数绑定、
使用final修饰使其不能改变
不可变的 @ConfigurationProperties 绑定
配置属性现在支持基于构造函数的绑定，该绑定使 @ConfigurationProperties 注释的类不可变。可以通过使用 @ConstructorBinding 注释 @ConfigurationProperties 类或其构造函数之一来启用基于构造函数的绑定。可以在配置属性绑定提供的构造函数参数上使用 @DefaultValue 和 @DateTimeFormat 之类的注释
@ConfigurationProperties("acme")
@Data
@ConstructorBinding
public class AcmeProperties {
private final boolean enabled;
private final InetAddress remoteAddress;
private final Security security;
public AcmeProperties(boolean enabled, InetAddress remoteAddress, Security security) {
this.enabled = enabled;
this.remoteAddress = remoteAddress;
this.security = security;
}
public static class Security {
private final String username;
private final String password;
private final List<String> roles;
public Security(String username, String password,
@DefaultValue("USER") List<String> roles) {
this.username = username;
this.password = password;
this.roles = roles;
}
}
}@Configuration
@EnableConfigurationProperties(value = AcmeProperties.class)
public class AcmeConfiguartion {
@Autowired
private AcmeProperties acmeProperties;
}如果您的类具有多个构造函数，则还可以@ConstructorBinding直接在应绑定的构造函数上使用
