Spring学习（2）---bean引用其它的bean的配置_person person = context.getname();-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_29642549/article/details/90643042

本文介绍了如何在Spring中配置bean引用其他bean，通过创建Car和Person类，并在Person类中注入Car对象，然后在XML配置文件中使用`ref`属性进行引用。最后通过测试类验证了配置的有效性。

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1、创建一个Car类

package com.springdemo;

public class Car {
	private String name;
	private String color;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getColor() {
		return color;
	}
	public void setColor(String color) {
		this.color = color;
	}
	@Override
	public String toString() {
		return "Car [name=" + name + ", color=" + color + "]";
	}
	
}

2、创建一个Person类，在Person类中赋予一个Car对象

package com.springdemo;

public class Person {
	private int id;
	private String name; 
	private Car car;
	public Person() {
		super();
		// TODO Auto-generated constructor stub
	}
	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;
	}
	public Car getCar() {
		return car;
	}
	public void setCar(Car car) {
		this.car = car;
	}
	@Override
	public String toString() {
		return "Person [id=" + id + ", name=" + name + ", car=" + car+ "]";
	}
}

3、要bean引用其它的bean，只需在applicationContext.xml中添加ref

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
    <bean name="car1" class="com.springdemo.Car">
    	<property name="name" value="法拉利"></property>
    	<property name="color" value="红色"></property>
    </bean>
  <!-- Person类的car的bean引用Car类的bean对象 -->
	<bean name="person" class="com.springdemo.Person">
		<property name="id" value="1"></property>
		<property name="name" value="张三"></property>
		<property name="car" ref="car1"></property>
	</bean>
        
 </beans>

4、创建一个测试类

package com.test;

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

import com.springdemo.Person;

public class MyTest {
	@Test
	public void test(){
		//获取spring上下文对象
		ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
		Person p=(Person) context.getBean("person");

		System.out.println(p);

	}
}

5、运行结果