spring-boot属性不是@Autowired

我正在尝试使用Spring-boot应用程序，我不确定我在这里做错了什么。 我在src / main / resources＆src / test / resources上有一个application.properties文件。 我的ConfigurationSettings有一个@Bean，所以我可以在整个应用程序中使用它们：

@Component public class ConfigurationSettings { private String product; private String version; private String copyright; private String appName; private String appDescription; ... // getters and setters } 

以下是我如何启动应用程序：

 @Configuration @EnableJpaRepositories @EnableAutoConfiguration @EnableConfigurationProperties @PropertySources(value = {@PropertySource("classpath:application.properties")}) @ComponentScan(basePackages = "com.product") @EnableScheduling public class OFAC { public static void main(String[] args) { ApplicationContext ctx = SpringApplication.run( OFAC.class, args ); } 

这是我的配置类：

 @Configuration @ComponentScan(basePackages = {"com.product"}) @PropertySources(value = {@PropertySource("classpath:application.properties")}) public class OFAConfiguration { @Autowired private Environment env; @Bean public ConfigurationSettings configurationSettings() { ConfigurationSettings configurationSettings = new ConfigurationSettings(); configurationSettings.setAppDescription( env.getRequiredProperty("app.description" ) ); configurationSettings.setAppName( env.getRequiredProperty( "app.name" ) ); configurationSettings.setServerPort( env.getRequiredProperty( "server.port" ) ); return configurationSettings; } 

我试图在控制器中使用它：

 @RestController public class AboutController { @Autowired private ConfigurationSettings configurationSettings; @RequestMapping(value = "/about", method = RequestMethod.GET) public About index() { String product = configurationSettings.getProduct(); String version = configurationSettings.getVersion(); String copyright = configurationSettings.getCopyright(); return new About( product, version, copyright ); } } 

但是，当通过此步骤时，ConfigurationSettings的所有值都为null。 我有一个成功加载值的测试：

 @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(classes = {OFAConfiguration.class}) public class OFAConfigurationTest { @Autowired private Environment environment; @Autowired private ConfigurationSettings configurationSettings; @Test public void testConfigurationLoads() { assertNotNull(environment); Assert.assertNotNull(configurationSettings); } @Test public void testConfigurationSettingValues() { assertEquals("Product Name", configurationSettings.getProduct()); assertEquals("0.0.1", configurationSettings.getVersion()); assertEquals("2014 Product", configurationSettings.getCopyright()); } 

任何人都可以看到为什么我的控制器中没有填充ConfigurationSettings？

Answer 1

您的配置将导致ConfigurationSettings类的2个实例，并且可能一个实例会覆盖另一个实例。

当您扫描组件（ @ComponentScan ）时，’ConfigurationSettings’具有@Component注释，这将导致实例。 您还有一个@Bean注释的方法，它也可以导致一个实例。 后者被第一个覆盖。

简而言之，删除@Component注释，因为您已经拥有此类的工厂方法。

 public class ConfigurationSettings { ... } 

您还应该删除@PropertySource注释，因为Spring-Boot已经为您加载了application.properties 。

最后，您不应在测试类上使用@ContextConfiguration批注，而应使用@SpringApplicationConfiguration并传入您的应用程序类（而不是您的配置类！）。

 @RunWith(SpringJUnit4ClassRunner.class) @SpringApplicationConfiguration(classes=OFAC.class) public class OFAConfigurationTest { @Autowired private Environment environment; @Autowired private ConfigurationSettings configurationSettings; @Test public void testConfigurationLoads() { assertNotNull(environment); assertNotNull(configurationSettings); } @Test public void testConfigurationSettingValues() { assertEquals("Product Name", configurationSettings.getProduct()); assertEquals("0.0.1", configurationSettings.getVersion()); assertEquals("2014 Product", configurationSettings.getCopyright()); } 

这将解决您的运行时配置问题，并让您的测试使用Spring Boot的强大function来配置您的应用程序。