使用ioc创建对象的方式之一(通过无参的构造方法来创建：)

通过无参的构造方法来创建：

User.java

package com.yikuan.vo;

public class User {
    public User() {
        System.out.println("user的无参构造方法！");
    }
    private String name;
    public void setName(String name) {
        this.name = name;
    }
    public void show(){
        System.out.println("name："+name);
    }
}

beans.xml

<?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就是java对象，由spring容器来创建和管理 -->
        <bean id="user" class="com.yikuan.vo.User">
            <property name="name" value="张三"></property>
        </bean>
</beans>

Test1.java

package com.yikuan.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.yikuan.vo.User;

public class Test1 {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
        User user = (User) ac.getBean("user");
        user.show();
    }
}