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 person = (Person) ctx.getBean("person");        System.out.println(person);    }} class Car {    private String brand;    private double price;    public String getBrand() {        return brand;    }    public void setBrand(String brand) {        this.brand = brand;    }    public double getPrice() {        return price;    }    public void setPrice(double price) {        this.price = price;    }    @Override    public String toString() {        return "Car [brand=" + brand + ", price=" + price + "]";    }}  class Address {    private String city;    private String street;    public String getCity() {        return city;    }    public void setCity(String city) {        this.city = city;    }    public String getStreet() {        return street;    }    public void setStreet(String street) {        this.street = street;    }    @Override    public String toString() {        return "Address [city=" + city + ", street=" + street + "]";    }} class Person {    private String name;    private Address address;    private Car car;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Address getAddress() {        return address;    }    public void setAddress(Address address) {        this.address = address;    }    public Car getCar() {        return car;    }    public void setCar(Car car) {        this.car = car;    }    @Override    public String toString() {        return "Person [name=" + name + ", address=" + address + ", car=" + car                + "]";    }}

<?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.xsd">    <!-- 手动装配Bean -->    <bean id="address" class="com.company.Address"          p:city="WhuHan" p:street="Bayi"></bean>    <bean id="car" class="com.company.Car"          p:brand="Audi" p:price="300000"></bean>    <bean id="person" class="com.company.Person"          p:name="Roger" p:address-ref="address" p:car-ref="car"></bean>    </beans>

Person [name=Roger, address=Address [city=WhuHan, street=Bayi], car=Car [brand=Audi, price=300000.0]]

    <bean id="person" class="com.company.Person"          p:name="Roger" ></bean>

Person [name=Roger, address=null, car=null]

<?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.xsd">    <!-- 手动装配Bean -->    <bean id="address" class="com.company.Address"          p:city="WhuHan" p:street="Bayi"></bean>    <bean id="car" class="com.company.Car"          p:brand="Audi" p:price="300000"></bean>    <bean id="person" class="com.company.Person"          p:name="Roger" autowire="byName"></bean></beans>    

Person [name=Roger, address=Address [city=WhuHan, street=Bayi], car=Car [brand=Audi, price=300000.0]]

    <context:component-scan            base-package="com.company">    </context:component-scan>