彈簧引導屬性不@ @ Autowired

Question

我想要得到一個Spring引導應用程序去，我不知道我在做什麼錯在這裏。我在src/main/resources & src/test/resources中有一個application.properties文件。我有我的ConfigurationSettings的@Bean，這樣我可以在我的應用程序中使用它們：

@Component 
public class ConfigurationSettings { 

private String product; 
private String version; 
private String copyright; 
private String appName; 
private String appDescription; 
... 
// getters and setters 

} 

這裏是我踢的應用程序關閉：

@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);   
} 

這裏是我的配置類：

@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; 
    } 

我想在一個控制器來使用它：

@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，通過此步驟時，ConfigurationSettings的所有值都爲空。我有一個測試，成功加載的值：

@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()); 
} 

任何人都可以看到爲什麼ConfigurationSettings沒有填充在我的控制器？

Answer 1

您的配置導致ConfigurationSettings類的兩個實例，可能有一個實例會覆蓋另一個實例。

當您掃描組件（@ComponentScan）時，'ConfigurationSettings'具有@Component註釋，這將導致實例。你也有一個@Bean註釋的方法，這也會導致一個實例。後者被第一個覆蓋。

簡而言之，刪除@Component註釋，因爲這是不需要的，因爲您已經擁有該類的工廠方法。

public class ConfigurationSettings { ... } 

你也應該刪除@PropertySource註解彈簧引導就已經加載application.properties你。

最後，您不應該在測試類中使用@ContextConfiguration註釋，而是使用@SpringApplicationConfiguration並傳入應用程序類（而不是您的配置類！）。

@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()); 
    } 

這將解決您的運行時配置的問題，將讓你的測試使用Spring引導的力量來配置應用程序。