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App.java
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package com.chen.spring;
import com.chen.spring.ioc.MessageService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* @author : chen weijie
* @Date: 2019-08-09 00:09
*/
public class App {
public static void main(String[] args) {
// 用我们的配置文件来启动一个 ApplicationContext
ApplicationContext context = new ClassPathXmlApplicationContext("classpath:application.xml");
System.out.println("context 启动成功");
// 从 context 中取出我们的 Bean，而不是用 new MessageServiceImpl() 这种方式
MessageService messageService = context.getBean(MessageService.class);
// 这句将输出: hello world
System.out.println(messageService.getMessage());
}
}