Spring外部化配置的几种技巧分享

@Log4j2
@SpringBootApplication
public class ConfigurationApplication {

    public static void main(String[] args) {
        SpringApplication.run(ConfigurationApplication.class, args);
    }
    @Bean
    ApplicationRunner applicationRunner(Environment environment){

        return  args -> {
            log.info("user.name : {}",environment.getProperty("user.name"));
        };
    }
}

--spring.config.name=app

@Bean
ApplicationRunner applicationRunner(Environment environment,
                           @Value("${greeting.message:hello boy}") String message){

   return  args -> {
      log.info("from application.properties user.name : {}",environment.getProperty("user.name"));
      log.info("from application.properties greeting.message : {}",message);

   };
}

@Value("${greeting.message:hello boy}")

public static void main(String[] args) {

        new SpringApplicationBuilder()
                .sources(ConfigurationApplication.class)
                .run(args);
}

@Autowired
void getConfigurableEnvrionment(ConfigurableEnvironment environment) {
    environment.getPropertySources().addLast(new MyPropertySource());
}

    public static void main(String[] args) {

        new SpringApplicationBuilder()
                .sources(ConfigurationApplication.class)
                .initializers(applicationContext ->
                 applicationContext.getEnvironment().getPropertySources().addLast(new MyPropertySource()))
                .run(args);
    }

static  class  MyPropertySource extends PropertySource<String>{


   public MyPropertySource() {
      super("myproperty");
   }

   @Override
   public Object getProperty(String name) {

      if(name.equalsIgnoreCase("author-name")){
         return  "john";
      }
      return null;
   }
}

    @Bean
    ApplicationRunner applicationRunner(Environment environment,
                                        @Value("${greeting.message:hello boy}") String message,
                                        @Value("${author-name}") String name){

        return  args -> {
            log.info("from application.properties user.name : {}",environment.getProperty("user.name"));
            log.info("from application.properties author.name : {}",name);
        };
    }