7-spring自动装配（1）

bean自动装配

代码

用一个项目来说明，如下：

其中各个文件代码如下：

Cat:

package com.ajream.pojo;

public class Cat {
    public void shout(){
        System.out.println("miao~");
    }
}

Dog:

package com.ajream.pojo;

public class Dog {
    public void shout(){
        System.out.println("wang~");
    }
}

Person:

package com.ajream.pojo;

public class Person {
    private String name;
    private Cat cat;
    private Dog dog;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Cat getCat() {
        return cat;
    }

    public void setCat(Cat cat) {
        this.cat = cat;
    }

    public Dog getDog() {
        return dog;
    }

    public void setDog(Dog dog) {
        this.dog = dog;
    }

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", cat=" + cat +
                ", dog=" + dog +
                '}';
    }

}

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
        https://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="dog" class="com.ajream.pojo.Dog"/>
    <bean id="cat" class="com.ajream.pojo.Cat"/>
    <bean id="person" class="com.ajream.pojo.Person">
        <property name="name" value="张三"/>
        <property name="cat" ref="cat"/>
        <property name="dog" ref="dog"/>
    </bean>
</beans>

MyTest:

import com.ajream.pojo.Person;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


public class MyTest {

    public static void main(String[] args) {
        
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        Person p = context.getBean("person", Person.class);

        System.out.println(p.getName());
        p.getCat().shout();
        p.getDog().shout();

    }

}