<?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="user" class="io.zekai.entity.User" >

        <!--<constructor-arg type="int" value="1994"></constructor-arg>-->

        <!--<constructor-arg type="String" value="大仙"></constructor-arg>-->

        <property name="id" value="10000"/>

        <property name="name" value="狂尊"/>

    </bean>

</beans>

package io.zekai.entity;

/**

 * Created by zekai on 2017/6/3.

 */

public class User {

    private int id;

    private String name;

    public User() {

    }

    public User(int id, String name) {

        this.id = id;

        this.name = name;

    }

    public int getId() {

        return id;

    }

    public void setId(int id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

}

package io.zekai.entity;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

/**

 * Created by zekai on 2017/6/3.

 */

public class Main {

    public static void main(String[] args) {

        ApplicationContext context=new ClassPathXmlApplicationContext("./io/zekai/entity/application-context.xml");

        //通过构造器 根据bean的唯一id

        User user=context.getBean(User.class);

        System.out.println(user.getName());

        System.out.println(user.getId());

    }

}

<?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="user" class="io.zekai.entity.User" >

        <!--<constructor-arg type="int" value="1994"></constructor-arg>-->

        <!--<constructor-arg type="String" value="大仙"></constructor-arg>-->

        <property name="id" value="10000"/>

        <property name="name" value="狂尊"/>

    </bean>

    <bean id="fatherUser" class="io.zekai.entity.UserFather">

        <property name="fatherName" value="laodies"/>

        <property name="user" ref="user"/><!--ref参考的是xml中的-->

    </bean>

</beans>

package io.zekai.entity;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

/**

 * Created by zekai on 2017/6/3.

 */

public class Main {

    public static void main(String[] args) {

        ApplicationContext context=new ClassPathXmlApplicationContext("io/zekai/entity/application-context.xml");

        UserFather user=context.getBean(UserFather.class);

        System.out.println(user.getFatherName());

    }

}