接著上一節的課程繼續學習

MesasageService 類 package hello;import org.springframework.stereotype.Component; //注解的加入 @Component public class MesasageService {public MesasageService() {super();System.out.println("MessageService...");}/*** 執行打印功能* @return 返回要打印的字符串*/public String getMessage(){return "Hello World";} } MessagePrinter類 package hello;import org.springframework.stereotype.Component; //注解的加入 @Component public class MessagePrinter {//無參構造方法的加入public MessagePrinter() {super();System.out.println("MessagePrinter...");}private MesasageService service;/** 簡歷和MessageService的關系* *///設置service的值public void setService(MesasageService service){this.service =service;}public void printMessage(){System.out.println(this.service.getMessage());} } ApplicationSpring類 package hello;import org.springframework.context.ApplicationContext; import org.springframework.context.annotation.AnnotationConfigApplicationContext; import org.springframework.context.annotation.ComponentScan;//加入掃描 @ComponentScan public class ApplicationSpring {public static void main(String[] args){System.out.println("appliaction....");//初始化springApplicationContext context =new AnnotationConfigApplicationContext(ApplicationSpring.class);//獲取messagePrinter對象MessagePrinter printer=context.getBean(MessagePrinter.class);//獲取messafeService對象MesasageService service=context.getBean(MesasageService.class);System.out.println(printer);System.out.println(service);printer.setService(service);//打印消息printer.printMessage();} }

運行結果

appliaction.... 10月 27, 2019 6:30:54 下午 org.springframework.context.annotation.AnnotationConfigApplicationContext prepareRefresh 信息: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@3d012ddd: startup date [Sun Oct 27 18:30:54 CST 2019]; root of context hierarchy MessageService... MessagePrinter... hello.MessagePrinter@10e92f8f hello.MesasageService@7ce3cb8e Hello World

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