依赖注入_注解版_注入一般属性

第一步:实体注释加注入属性

//car实体

解释:注释注入可以没有setter方法,必须有空参,因为IOC容器需要空参构造,不写默认有一个空参

package it.heima.domain;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
//注释
package it.heima.domain;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component("car")
public class Car {
    @Value("#{'一汽大众'}")
    private String name;
    @Value("#{10000}")
    private Double price;

    public Car() {
    }
    
    @Override
    public String toString() {
        return "Car{" +
                "name='" + name + '\'' +
                ", price=" + price +
                '}';
    }
}

第二步:配置(自动扫描包)

<?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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    //自动扫描包
    <context:component-scan base-package="it.heima.domain"/>
</beans>

第三步:测试

@Test
public void test(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext_annotation.xml");
    Car car = applicationContext.getBean("car", Car.class);
    System.out.println(car);
}

结果: