接着上一节的课程继续学习
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:描述当前的对象需要由spring容器管理id属性:标识对象 未来在应用程序中可以根据id获取对象class对象:被管理的对象的全名--><bean id="service" class="hello.MesasageService"></bean><bean id="printer" class="hello.MessagePrinter"><property name="service" ref="service"></property></bean>
</beans>
MesasageService 类
package hello;//去掉注解public class MesasageService {public MesasageService() {super();System.out.println("MessageService...");}/*** 执行打印功能* @return 返回要打印的字符串*/public String getMessage(){return "Hello World";}
}
MessagePrinter类
package hello;//去掉注解public class MessagePrinter {//无参构造方法的加入public MessagePrinter() {super();System.out.println("MessagePrinter...");}private MesasageService service;/** 简历和MessageService的关系* *///设置service的值//创建关联关系public void setService(MesasageService service){this.service =service;}public void printMessage(){System.out.println(this.service.getMessage());}
}
ApplicationSpring类
package hello;import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;//加入扫描public class ApplicationSpring {public static void main(String[] args){System.out.println("appliaction....");//初始化springApplicationContext context =new ClassPathXmlApplicationContext("applicationContext.xml");//获取messagePrinter对象MessagePrinter printer=context.getBean(MessagePrinter.class);printer.printMessage();}
}
运行结果
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