Spring Boot配置中列表的环境变量

Suggestion, don’t overcomplicate.

Say you want that list as an

Environment

-Dtopics=topic-01,topic-02,topic-03

You then can recover it using the injected

Environment

List<String>

@Bean@Qualifier("topics")List<String> topics(final Environment environment) {    final var topics = environment.getProperty("topics", "");    return Arrays.asList(topics.split(","));}

From now on, that

List

@Autowired

@Topics

Then

@Serviceclass TopicService {   @Topics   @Autowired   private List<String> topics;   ...}

Or even

@Serviceclass TopicService {   private final List<String> topics;   TopicService(@Topics final List<String> topics) {      this.topics = topics;   }   ...}

What you could do is use an externalized file.
Pass to the environment parameters the path to that file.

-DtopicsPath=C:/whatever/path/file.json

Than use the

Environment

Jackson

You’d also need to create a simple

Topic

public class Topic {    public String name;    public String id;}

Which represents an element of this

JSON

[    {        "name": "topic-1",        "id": "id-1"    },    {        "name": "topic-2",        "id": "id-2"    }]

@BeanList<Topic> topics(        final Environment environment,        final ObjectMapper objectMapper) throws IOException {    // Get the file path    final var topicsPath = environment.getProperty("topicsPath");    if (topicsPath == null) {        return Collections.emptyList();    }    // Read the file content    final var json = Files.readString(Paths.get(topicsPath));    // Convert the JSON to Java objects    final var topics = objectMapper.readValue(json, Topic[].class);    return Arrays.asList(topics);}