Spring Learning-day01

<!-- 配置bean class: bean的全类名，通过反射的方式在 IOC 的容器中创建 Bean.　所以要求 中必须有无参数的构造器 id：标识容器中的 bean. id 是唯一的 --> <!-- 使用 setter 方法进行属性注入 --> <bean id="helloWorld" class="com.atguigu.spring.beans.HelloWorld"> <property name="userName" value="Spring"></property> </bean> <!-- 使用构造器注入属性值可以指定参数的位置和参数的类型，以区分重载的构造器 --> <bean id="car" class="com.atguigu.spring.beans.Car"> <constructor-arg value="1000" index="0"></constructor-arg> <constructor-arg value="Audi" index="1"></constructor-arg> <constructor-arg value="shanghai" type="java.lang.String"></constructor-arg> </bean>

Package Com.atguigu.spring.beans;import Org.springframework.context.applicationcontext;import org.springframework.context.support.classpathxmlapplicationcontext;/** * @author Country True * */public class Main {public stat        IC void Main (string[] args) {/*//Create a HelloWorld object HelloWorld HelloWorld = new HelloWorld ();        Set the name Helloworld.setusername ("Spring"); *///1. Create a Spring IOC container object//applicationcontext represents the IOC container//classpathxmlapplicationcontext: is the implementation class of the ApplicationContext interface,        The implementation class loads the XML configuration file from the classpath applicationcontext ctx = new Classpathxmlapplicationcontext ("One.xml"); 2.        Gets the bean instance from the IOC container//uses the ID to locate the bean in the IOC container 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"); Returns the Bean in the IOC container using the type, but requires the IOC capacityThere must be only one bean//HelloWorld HelloWorld = Ctx.getbean (helloworld.class) of that type in the device; 3.        Print name 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();    }}

Spring Learning-day01