SpringBoot自动配置实现流程详细分析

@Component
@ConfigurationProperties(prefix = "mycar")
public class Car {
    private String brand;
    private Integer price;
    private Integer seatNum;
    public Integer getSeatNum() {
        return seatNum;
    }
    public void setSeatNum(Integer seatNum) {
        this.seatNum = seatNum;
    }
    public String getBrand() {
        return brand;
    }
    public void setBrand(String brand) {
        this.brand = brand;
    }
    public Integer getPrice() {
        return price;
    }
    public void setPrice(Integer price) {
        this.price = price;
    }
    @Override
    public String toString() {
        return "Car{" +
                "brand='" + brand + '\'' +
                ", price=" + price +
                ", seatNum=" + seatNum +
                '}';
    }
    public Car() {
    }
}

public class MainApplication {
    public static void main(String[] args) {
        //返回springboot中的ioc容器
        ConfigurableApplicationContext run = SpringApplication.run(MainApplication.class, args);
        Car car = run.getBean("car", Car.class);
        System.out.println(car);
    }
}

11 usages
@ConfigurationProperties(prefix = "mycar " )
public class Car {
3 usages
private String brand ;
3 usages
private Integer price ;
3 usages

    <bean id="car" class="xxx.xxx.xxx.Car">
        <property name="brand" value=""/>
        <property name="price" value=" "/>
        <property name="seatNum" value=" "/>
    </bean>

    @Bean
    public Car car(){
        Car car = new Car();
        return car;
    }

@ConfigurationProperties(prefix = "mycar")注解

@EnableConfigurationProperties(Car.class)注解开启即可

@Configuration(proxyBeanMethods = false)
@EnableConfigurationProperties(Car.class)
public class CarAutoConfiguration {
    @Bean
    public Car car(){
        Car car = new Car();
        return car;
    }
}