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在我的項目中我有一個基於Spring Boot的庫，爲我提供了一些常用的服務。在Spring Boot項目中，我使用庫並在嘗試檢索某些外部配置時遇到一些問題。Spring Boot：外部配置導致空值
庫「讀取」AssetServiceProperties中的某些外部配置。
@ConfigurationProperties("service.assets")
public class AssetServiceProperties {
private String url;
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
該類爲AssetServiceConfiguration的Java表示提供這些（外部）屬性。
@Configuration
@EnableConfigurationProperties(AssetServiceProperties.class)
public class AssetServiceConfiguration {
@Bean
public AssetServiceClient assetServiceClient(AssetServiceProperties properties) {
return new AssetServiceClient(properties.getUrl());
}
}
AssetServiceClient是爲客戶端公開的庫的一部分。
public class AssetServiceClient {
private String url;
private RestTemplate restTemplate;
public static final String CONTROLLER = "assets";
public AssetServiceClient(String url) {
this.url = url;
restTemplate = new RestTemplate();
}
public AssetsResponse getByService(String service) {
UriComponentsBuilder builder = UriComponentsBuilder.
fromUriString(url).
pathSegment(CONTROLLER).
queryParam("service", service);
return restTemplate.getForObject(builder.build().encode().toUri(), AssetsResponse.class);
}
}
春季啓動項目導入庫，並配置了外部配置文件application.properties包含外部配置service.assets是在導入庫中定義。
@SpringBootApplication
@EntityScan(basePackageClasses = { Application.class, Jsr310JpaConverters.class })
@Import({AssetServiceConfiguration.class})
@PropertySource(value="classpath:internal.properties")
@PropertySource(value="file:${application.properties}")
public class Application extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(Application.class);
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
使用基於Spring Boot的庫的項目的相關部分是我的AssetController。
@RestController
@RequestMapping(value = "/assets")
public class AssetController {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
private AssetServiceClient assetServiceClient;
private AssetResourceAssembler assetResourceAssembler;
@Autowired
public AssetController(
AssetServiceClient assetServiceClient,
AssetResourceAssembler assetResourceAssembler) {
Assert.notNull(assetServiceClient, "assetServiceClient cannot be null");
this.assetServiceClient = assetServiceClient;
this.assetResourceAssembler = assetResourceAssembler;
}
@GetMapping(produces = {MediaType.APPLICATION_JSON_VALUE, MediaTypes.HAL_JSON_VALUE})
public ResponseEntity<Resources<AssetResource>> getAll() {
AssetsResponse assets = assetServiceClient.getByService("tasks");
return ResponseEntity.ok(assetResourceAssembler.toResourceList(assets.getContent()));
}
}
問題定義：當春天啓動項目的代碼執行的service.assets值爲空。 Spring Boot不讀取文件application.properties中的外部配置的值。爲什麼？我該如何解決它才能運行？
另一個提示：試圖從春天啓動項目
@Value("${service.assets}")
String url;
春天引導內得到service.assets與下面的代碼時，讀取配置，並得到它充滿了應有的價值。
使用的Spring Boot版本是1.5.3.RELEASE。
我感謝所有幫助
和使用'@ ConfigurationProperties'你需要指定'service.assets.url'你的屬性文件，不只是'service.assets'。 – alfcope