1，xml+基于注解配置(第一步：在xml开启注解配置)

@Component 　　被表示类会被纳入 spring ioc 容器进行管理，相当于

@Value　　　　   为类注入基本类型和String属性值

@Autowired　　　为类注入应用类型属性值；默认按类型注入，可以通过@Qualifier("dog2")指定bean，同时也可以通过bean加入primary=true 优先被Autowired注入

@Resource　　    默认按类型注入，如果指定了name属性，则按bean名称注入

例：

添加配置文件beans-annotation.xml

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

https://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/context

https://www.springframework.org/schema/context/spring-context.xsd">

添加Dog类

@Component

public class Dog {

@Value("旺财")

private String name;

@Value("公")

private String sex;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getSex() {

return sex;

}

public void setSex(String sex) {

this.sex = sex;

}

@Override

public String toString() {

return "entity.Dog [name=" + name + ", sex=" + sex + "]";

}

}

添加测试类

public static void main(String[] args) {

ApplicationContext context = new ClassPathXmlApplicationContext("beans-annotation.xml");

Dog dog = (Dog) context.getBean("dog");

System.out.println(dog.toString());

}

2，java+注解配置(主流，第一步：在配置类中开启注解扫描)

@ComponentScan("entity")　　会去entity扫描@Component @Value @Autowired进行创建bean或注入属性值

注意：需要再多导入一个包，spring-app-5.0.14.RELEASE.jar

1)AnnotationConfigApplicationContext

@Configuration　　指定该类为Spring ioc容器配置类，相当于beans.xml文件

@Bean(name ="user")　　将方法返回值纳入到spring ioc容器进行管理,相当于

例如：

添加配置文件beans-annotation.xml

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

https://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/context

https://www.springframework.org/schema/context/spring-context.xsd">

添加Dog类

public class Dog {

private String name;

private String sex;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getSex() {

return sex;

}

public void setSex(String sex) {

this.sex = sex;

}

@Override

public String toString() {

return "entity.Dog [name=" + name + ", sex=" + sex + "]";

}

}

添加工厂类

@Configuration

@ComponentScan(basePackages = "entity")

public class BeansConfig {

@Bean

public Dog getDog(){

Dog dog = new Dog();

dog.setSex("男");

dog.setName("王二麻子");

return dog;

}

}

添加测试类

public static void main(String[] args) {

AnnotationConfigApplicationContext configApplicationContext =

new AnnotationConfigApplicationContext(BeansConfig.class);

Object dog = configApplicationContext.getBean("getDog");

System.out.println(dog);

}