接著上一節的課程繼續學習

在resources文件下建立applicationconText

applicationconText.xml文件

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"><!--bean元素：描述當前的對象需要由spring容器管理id屬性：標識對象 未來在應用程序中可以根據id獲取對象class對象：被管理的對象的全名--><bean id="service" class="hello.MesasageService"></bean><bean id="printer" class="hello.MessagePrinter"><property name="service" ref="service"></property></bean> </beans> MesasageService 類 package hello;//去掉注解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;//去掉注解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//創建關聯關系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.support.ClassPathXmlApplicationContext;//加入掃描public class ApplicationSpring {public static void main(String[] args){System.out.println("appliaction....");//初始化springApplicationContext context =new ClassPathXmlApplicationContext("applicationContext.xml");//獲取messagePrinter對象MessagePrinter printer=context.getBean(MessagePrinter.class);printer.printMessage();} }

運行結果

appliaction.... 10月 27, 2019 7:37:17 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh 信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@1175e2db: startup date [Sun Oct 27 19:37:17 CST 2019]; root of context hierarchy 10月 27, 2019 7:37:17 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions 信息: Loading XML bean definitions from class path resource [applicationContext.xml] MessageService... MessagePrinter... Hello World

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