Application.yml参数注入到数组

首先，因为 @Value 的实现机制，下面这种注入是不支持的

application.yml

include:
  - E:\record\2022
  - E:\record\2023

Application.java

@SpringBootApplication
@Slf4j
@Data
public class Application implements CommandLineRunner {

    @Value("${include}")
    String[] include;

    public static void main(String[] args) {
        log.info("STARTING THE APPLICATION");
        SpringApplication.run(Application.class, args);
        log.info("APPLICATION FINISHED");
    }

    @Override
    public void run(String... args) {

        for (String str:include) {
            log.info(str);
        }
        
    }

}

会报错：

……
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'include' in value "${include}"
	at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:178) ~[spring-core-5.3.1.jar:5.3.1]
	at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) ~[spring-core-5.3.1.jar:5.3.1]
	at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:239) ~[spring-core-5.3.1.jar:5.3.1]
……

可以作为对象的属性注入

application.yml

args:
  include:
    - E:\record\2022
    - E:\record\2023

Args.java

@Component
@ConfigurationProperties(prefix="args")
@Data
public class Args {

    private String[] include;

}

Application.java

@SpringBootApplication
@Slf4j
@Data
public class Application implements CommandLineRunner {


    @Autowired
    Args args;

    public static void main(String[] args) {
        log.info("STARTING THE APPLICATION");
        SpringApplication.run(Application.class, args);
        log.info("APPLICATION FINISHED");
    }

    @Override
    public void run(String... args) {

        log.info("EXECUTING : command line runner");
        for (String str:this.args.getInclude()) {
            log.info(str);
        }

    }

}