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pom.xml <packaging> <artifactId>

<dependencies>

compile package install

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<artifactId>spring-context</artifactId>

1 package hello;2 3 public interface MessageService {4     String getMessage();5 }

1 package hello; 2  3 import org.springframework.beans.factory.annotation.Autowired; 4 import org.springframework.stereotype.Component; 5  6 @Component 7 public class MessagePrinter { 8  9     final private MessageService service;10 11     @Autowired12     public MessagePrinter(MessageService service) {13         this.service = service;14     }15 16     public void printMessage() {17         System.out.println(this.service.getMessage());18     }19 }

 

1 package hello; 2  3 import org.springframework.context.ApplicationContext; 4 import org.springframework.context.annotation.*; 5  6 @Configuration 7 @ComponentScan 8 public class Application { 9 10     @Bean11     MessageService mockMessageService() {12         return new MessageService() {13             public String getMessage() {14               return "Hello World!";15             }16         };17     }18 19   public static void main(String[] args) {20       ApplicationContext context = 21           new AnnotationConfigApplicationContext(Application.class);22       MessagePrinter printer = context.getBean(MessagePrinter.class);23       printer.printMessage();24   }25 }