Spring之引用其他Bean

1.新建实体类

public class Person {
    
    private String name;
    private String age;
    private Car car;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
    public Car getCar() {
        return car;
    }
    public void setCar(Car car) {
        this.car = car;
    }
    @Override
    public String toString() {
        return "Person [name=" + name + ", age=" + age + ", car=" + car + "]";
    }
}

2.新建XML文件

<?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:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">
    
    <bean id="car" class="com.auguigu.spring.beans.Car">
        <constructor-arg value="Audi" type="java.lang.String"></constructor-arg>
        <constructor-arg value="Shanghai" type="java.lang.String"></constructor-arg>
        <constructor-arg value="30000" type="int"></constructor-arg>
    </bean>    
    <bean id="person" class="com.auguigu.spring.beans.Person">
        <property name="name" value="Tom"></property>
        <property name="age" value="23"></property>
        <property name="car" ref="car"></property>
    </bean>
</beans>

这里通过ref来引入car这个bean

3.测试类Main

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

public class Main {
    public static void main(String[] args) {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("./applicationContext.xml");
        Person p = (Person) ctx.getBean("person");
        System.out.println(p);
    }
}

总结：

可以使用property属性的ref建立bean之间的引用关系