四.spring配置说明---1

package com.why;

/**
 * @program: Spring
 * @description:
 * @author: @why
 * @create: 2020-08-30 16:19
 **/
public class User {
    private  String name;

    public User(String name) {
        this.name = name;
    }
}

<!--id 就是变量名-->
<!--class bean对象所对应的类型-->
<!--name 也是别名 可以同时取多个别名-->
<!--scope 默认是单例 即只有一个对象 可以更改为不是单例的-->

<bean class="com.why.User" id="user">
    <constructor-arg  index="0" value="why"/>
</bean>
<alias name="user" alias="歪比歪比"/>

import com.why.User;
import com.why.service.ServiceIml;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @program: Spring
 * @description:
 * @author: @why
 * @create: 2020-08-30 15:57
 **/
public class Test {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring-config.xml");
//直接使用别名得到bean就ok了
        User bean = context.getBean("歪比歪比", User.class);
        System.out.println(bean.toString());
    }
}