Java - Spring IoC容器配置Bean的方式？

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- 基于XML文件进行配置。 
- 基于注解进行配置。 
- 基于Java程序进行配置（Spring 3+）

package chimomo.learning.java.code.spring;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class Person {
    private String name;
    private int age;
    @Autowired
    private Car car;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public void setCar(Car car) {
        this.car = car;
    }

    @Override
    public String toString() {
        return "Person [name=" + name + ", age=" + age + ", car=" + car + "]";
    }

}

package chimomo.learning.java.code.spring;

import org.springframework.stereotype.Component;

@Component
public class Car {
    private String brand;
    private int maxSpeed;

    public Car(String brand, int maxSpeed) {
        this.brand = brand;
        this.maxSpeed = maxSpeed;
    }

    @Override
    public String toString() {
        return "Car [brand=" + brand + ", maxSpeed=" + maxSpeed + "]";
    }

}

package chimomo.learning.java.code.spring;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import chimomo.learning.java.code.spring.Car;
import chimomo.learning.java.code.spring.Person;

@Configuration
public class AppConfig {

    @Bean
    public Car car() {
        return new Car("Benz", 320);
    }

    @Bean
    public Person person() {
        return new Person("X-Man", 34);
    }

}

package chimomo.learning.java.code.spring;

import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import chimomo.learning.java.code.spring.Person;
import chimomo.learning.java.code.spring.AppConfig;

class Test {

    public static void main(String[] args) {
        // TWR (Java 7+)
        try(ConfigurableApplicationContext factory = new AnnotationConfigApplicationContext(AppConfig.class)) {
            Person person = factory.getBean(Person.class);
            System.out.println(person);
        }
    }
}