Spring学习-day01

package com.atguigu.spring.beans;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;/** * @author 国真 * */public class Main {    public static void main(String[] args) {        /*        //创建一个helloWorld 对象        HelloWorld helloWorld = new HelloWorld();        //设置名字        helloWorld.setUserName("spring");        */        //1. 创建 Spring的IOC容器对象        //ApplicationContext 代表 IOC 容器        //ClassPathXmlApplicationContext：是ApplicationContext接口的实现类，该实现类从类路径下来加载xml配置文件        ApplicationContext ctx = new ClassPathXmlApplicationContext("one.xml");        //2. 从IOC容器中获取Bean实例        //利用 id 定位到 IOC 容器中的 Bean        HelloWorld helloWorld = (HelloWorld)ctx.getBean("helloWorld");        Car car = (Car)ctx.getBean("car");        Car car1 = (Car) ctx.getBean("car1");        Person person = (Person) ctx.getBean("person");        Person person2 = (Person) ctx.getBean("person2");        //利用类型返回 IOC 容器中的 Bean, 但要求 IOC 容器中必须只能有一个该类型的 Bean//      HelloWorld helloWorld = ctx.getBean(HelloWorld.class);        //3. 打印名字        helloWorld.hello();        System.out.println(car);        System.out.println(car1);        System.out.println(person);        System.out.println(person2);    }}

package com.atguigu.spring.beans;public class Person {    private String name;    private int age;    private Car car;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int 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 + "]";    }    public Person(String name, int age, Car car) {        super();        this.name = name;        this.age = age;        this.car = car;    }    public Person() {        super();    }}