spring之helloWorld实现

beans.xml文件

 //spring根据类HelloWorld来new一个helloWorld对象，根据id来去对象

<?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 id="helloWorld" class="com.java1234.test.HelloWorld"></bean>
</beans>

HelloWorld类

package com.java1234.test;

public class HelloWorld {
      public  void say(){
          System.out.println("Spring他大爷");
      }
}

测试类Test

package com.java1234.service;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.java1234.test.HelloWorld;

public class Test {

    public static void main(String[] args) {

       //加载beans.xml
        ApplicationContext ac=new ClassPathXmlApplicationContext("beans.xml");

       //获取spring管理的bean
        HelloWorld helloWorld=(HelloWorld)ac.getBean("helloWorld");
        helloWorld.say();
    }
}