Spring注解驱动开发-组件注册01-@Configuration@Bean

目录

1、xml方式

1.1 beans.xml

1.2 测试类 

2、注解方式

2.1 MainConfig.class

2.2 测试类

---

 

1、xml方式

1.1 beans.xml

<bean id="person" class="com.atguigu.bean.Person" >
	<property name="age" value="18"></property>
	<property name="name" value="zhangsan"></property>
</bean>

1.2 测试类 

package com.atguigu;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.atguigu.bean.Person;

public class MainTest {
	
	@SuppressWarnings("resource")
	public static void main(String[] args) {
		ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
		Person bean = (Person) applicationContext.getBean("person");
		System.out.println(bean);
	}

}

2、注解方式

2.1 MainConfig.class

package com.atguigu.config;

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

import com.atguigu.bean.Person;

//配置类==配置文件
@Configuration  //告诉Spring这是一个配置类
public class MainConfig {
	
	//给容器中注册一个Bean;类型为返回值的类型，id默认是用方法名作为id
	@Bean("person")
	public Person person01(){
		return new Person("lisi", 20);
	}

}

2.2 测试类

package com.atguigu;

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

import com.atguigu.bean.Person;
import com.atguigu.config.MainConfig;

public class MainTest {
	
	@SuppressWarnings("resource")
	public static void main(String[] args) {

		ApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfig.class);
		Person bean = applicationContext.getBean(Person.class);
		System.out.println(bean);
		
		String[] namesForType = applicationContext.getBeanNamesForType(Person.class);
		for (String name : namesForType) {
			System.out.println(name);
		}
	
	}

}