本篇文章為大家展示了在Spring Boot中實(shí)現(xiàn)從類路徑加載文件,內(nèi)容簡(jiǎn)明扼要并且容易理解,絕對(duì)能使你眼前一亮,通過這篇文章的詳細(xì)介紹希望你能有所收獲。
資源加載器
使用Java,您可以使用當(dāng)前線程的classLoader并嘗試加載文件,但是Spring Framework為您提供了更為優(yōu)雅的解決方案,例如ResourceLoader。
您只需要自動(dòng)連接ResourceLoader,然后調(diào)用getResource(„somePath“)方法即可。
在Spring Boot(WAR)中從資源目錄/類路徑加載文件的示例
在以下示例中,我們從類路徑中加載名為GeoLite2-Country.mmdb的文件作為資源,然后將其作為File對(duì)象檢索。
@Service("geolocationservice") public class GeoLocationServiceImpl implements GeoLocationService { private static final Logger LOGGER = LoggerFactory.getLogger(GeoLocationServiceImpl.class); private static DatabaseReader reader = null; private ResourceLoader resourceLoader; @Autowired public GeoLocationServiceImpl(ResourceLoader resourceLoader) { this.resourceLoader = resourceLoader; } @PostConstruct public void init() { try { LOGGER.info("GeoLocationServiceImpl: Trying to load GeoLite2-Country database..."); Resource resource = resourceLoader.getResource("classpath:GeoLite2-Country.mmdb"); File dbAsFile = resource.getFile(); // Initialize the reader reader = new DatabaseReader .Builder(dbAsFile) .fileMode(Reader.FileMode.MEMORY) .build(); LOGGER.info("GeoLocationServiceImpl: Database was loaded successfully."); } catch (IOException | NullPointerException e) { LOGGER.error("Database reader cound not be initialized. ", e); } } @PreDestroy public void preDestroy() { if (reader != null) { try { reader.close(); } catch (IOException e) { LOGGER.error("Failed to close the reader."); } } } }