注入Resource最常用的方式是通过classpath，即类似classpath:/logo.txt 表示在classpath中搜索logo.txt文件
使用Maven的标准目录结构，所有资源文件放入src/main/resources即可
@Component
public class AppService {
@Value("classpath:/logo.txt")
private Resource resource;
private String logo;
@PostConstruct
public void init() throws IOException {
try (var reader = new BufferedReader(
new InputStreamReader(resource.getInputStream(), StandardCharsets.UTF_8))) {
this.logo = reader.lines().collect(Collectors.joining("\n"));
}
}
}