类路径扫描和托管组件

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Component (1)
public @interface Service {

	// ...
}

@Target(AnnotationTarget.TYPE)
@Retention(AnnotationRetention.RUNTIME)
@MustBeDocumented
@Component (1)
annotation class Service {

	// ...
}

@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Scope(WebApplicationContext.SCOPE_SESSION)
public @interface SessionScope {

	/**
	 * Alias for {@link Scope#proxyMode}.
	 * <p>Defaults to {@link ScopedProxyMode#TARGET_CLASS}.
	 */
	@AliasFor(annotation = Scope.class)
	ScopedProxyMode proxyMode() default ScopedProxyMode.TARGET_CLASS;

}

@Target(AnnotationTarget.TYPE, AnnotationTarget.FUNCTION)
@Retention(AnnotationRetention.RUNTIME)
@MustBeDocumented
@Scope(WebApplicationContext.SCOPE_SESSION)
annotation class SessionScope(
		@get:AliasFor(annotation = Scope::class)
		val proxyMode: ScopedProxyMode = ScopedProxyMode.TARGET_CLASS
)

@Service
@SessionScope
public class SessionScopedService {
	// ...
}

@Service
@SessionScope
class SessionScopedService {
	// ...
}

@Service
@SessionScope(proxyMode = ScopedProxyMode.INTERFACES)
public class SessionScopedUserService implements UserService {
	// ...
}

@Service
@SessionScope(proxyMode = ScopedProxyMode.INTERFACES)
class SessionScopedUserService : UserService {
	// ...
}

@Service
public class SimpleMovieLister {

	private MovieFinder movieFinder;

	public SimpleMovieLister(MovieFinder movieFinder) {
		this.movieFinder = movieFinder;
	}
}

@Service
class SimpleMovieLister(private val movieFinder: MovieFinder)

@Repository
public class JpaMovieFinder implements MovieFinder {
	// implementation elided for clarity
}

@Repository
class JpaMovieFinder : MovieFinder {
	// implementation elided for clarity
}

@Configuration
@ComponentScan(basePackages = "org.example")
public class AppConfig  {
	// ...
}

@Configuration
@ComponentScan(basePackages = ["org.example"])
class AppConfig  {
	// ...
}

@Configuration
@ComponentScan(basePackages = "org.example",
		includeFilters = @Filter(type = FilterType.REGEX, pattern = ".*Stub.*Repository"),
		excludeFilters = @Filter(Repository.class))
public class AppConfig {
	// ...
}

@Configuration
@ComponentScan(basePackages = ["org.example"],
		includeFilters = [Filter(type = FilterType.REGEX, pattern = [".*Stub.*Repository"])],
		excludeFilters = [Filter(Repository::class)])
class AppConfig {
	// ...
}

@Component
public class FactoryMethodComponent {

	@Bean
	@Qualifier("public")
	public TestBean publicInstance() {
		return new TestBean("publicInstance");
	}

	public void doWork() {
		// Component method implementation omitted
	}
}

@Component
class FactoryMethodComponent {

	@Bean
	@Qualifier("public")
	fun publicInstance() = TestBean("publicInstance")

	fun doWork() {
		// Component method implementation omitted
	}
}

@Component
public class FactoryMethodComponent {

	private static int i;

	@Bean
	@Qualifier("public")
	public TestBean publicInstance() {
		return new TestBean("publicInstance");
	}

	// use of a custom qualifier and autowiring of method parameters
	@Bean
	protected TestBean protectedInstance(
			@Qualifier("public") TestBean spouse,
			@Value("#{privateInstance.age}") String country) {
		TestBean tb = new TestBean("protectedInstance", 1);
		tb.setSpouse(spouse);
		tb.setCountry(country);
		return tb;
	}

	@Bean
	private TestBean privateInstance() {
		return new TestBean("privateInstance", i++);
	}

	@Bean
	@RequestScope
	public TestBean requestScopedInstance() {
		return new TestBean("requestScopedInstance", 3);
	}
}

@Component
class FactoryMethodComponent {

	companion object {
		private var i: Int = 0
	}

	@Bean
	@Qualifier("public")
	fun publicInstance() = TestBean("publicInstance")

	// use of a custom qualifier and autowiring of method parameters
	@Bean
	protected fun protectedInstance(
			@Qualifier("public") spouse: TestBean,
			@Value("#{privateInstance.age}") country: String) = TestBean("protectedInstance", 1).apply {
		this.spouse = spouse
		this.country = country
	}

	@Bean
	private fun privateInstance() = TestBean("privateInstance", i++)

	@Bean
	@RequestScope
	fun requestScopedInstance() = TestBean("requestScopedInstance", 3)
}

@Component
public class FactoryMethodComponent {

	@Bean @Scope("prototype")
	public TestBean prototypeInstance(InjectionPoint injectionPoint) {
		return new TestBean("prototypeInstance for " + injectionPoint.getMember());
	}
}

@Component
class FactoryMethodComponent {

	@Bean
	@Scope("prototype")
	fun prototypeInstance(injectionPoint: InjectionPoint) =
			TestBean("prototypeInstance for ${injectionPoint.member}")
}

@Service("myMovieLister")
public class SimpleMovieLister {
	// ...
}

@Service("myMovieLister")
class SimpleMovieLister {
	// ...
}

@Repository
public class MovieFinderImpl implements MovieFinder {
	// ...
}

@Repository
class MovieFinderImpl : MovieFinder {
	// ...
}

@Configuration
@ComponentScan(basePackages = "org.example", nameGenerator = MyNameGenerator.class)
public class AppConfig {
	// ...
}

@Configuration
@ComponentScan(basePackages = ["org.example"], nameGenerator = MyNameGenerator::class)
class AppConfig {
	// ...
}

@Scope("prototype")
@Repository
public class MovieFinderImpl implements MovieFinder {
	// ...
}

@Scope("prototype")
@Repository
class MovieFinderImpl : MovieFinder {
	// ...
}

@Configuration
@ComponentScan(basePackages = "org.example", scopeResolver = MyScopeResolver.class)
public class AppConfig {
	// ...
}

@Configuration
@ComponentScan(basePackages = ["org.example"], scopeResolver = MyScopeResolver::class)
class AppConfig {
	// ...
}

@Configuration
@ComponentScan(basePackages = "org.example", scopedProxy = ScopedProxyMode.INTERFACES)
public class AppConfig {
	// ...
}

@Configuration
@ComponentScan(basePackages = ["org.example"], scopedProxy = ScopedProxyMode.INTERFACES)
class AppConfig {
	// ...
}

@Component
@Qualifier("Action")
public class ActionMovieCatalog implements MovieCatalog {
	// ...
}

@Component
@Qualifier("Action")
class ActionMovieCatalog : MovieCatalog

@Component
@Genre("Action")
public class ActionMovieCatalog implements MovieCatalog {
	// ...
}

@Component
@Genre("Action")
class ActionMovieCatalog : MovieCatalog {
	// ...
}

@Component
@Offline
public class CachingMovieCatalog implements MovieCatalog {
	// ...
}

@Component
@Offline
class CachingMovieCatalog : MovieCatalog {
	// ...
}