Spring注解驱动开发——组件注册 @Configuration

一   @Bean

1）方法名作为容器bean的id

1 代码

package com.mongoubiubiu.conf;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.ComponentScans;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.context.annotation.Import;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Service;

import com.mongoubiubiu.bean.Black;
import com.mongoubiubiu.bean.ColorFactoryBean;
import com.mongoubiubiu.bean.Person;
import com.mongoubiubiu.bean.Red;
import com.mongoubiubiu.bean.Yellow;
import com.mongoubiubiu.condition.MyInportSelect;
import com.mongoubiubiu.dao.UserDao;
import com.mongoubiubiu.service.UserService;

//配置类==配置文件
@Configuration  //告诉spring 这是一个配置类
public class MyConf {
    
    //给容器中注册一个bean; 类型为返回值的类型 id默认是用方法名做为id
    @Bean
    public Person person222(){
        return new Person("王五", 19);
    }
    
}

2 测试

package com.mongoubiubiu;

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

import com.mongoubiubiu.bean.Person;
import com.mongoubiubiu.conf.MyConf;

public class MainTest {

    public static void main(String[] args) {


        ApplicationContext applica=    new AnnotationConfigApplicationContext(MyConf.class);
        

        String[] applicastr=   applica.getBeanNamesForType(Person.class);
     
        for (String string : applicastr) {
            System.out.println(string);

        }
        
        
     
    
    
    }

}

 可以发现方法名作为容器中bean 的id

2)自定义bean的id

1 代码

    //给容器中注册一个bean; 类型为返回值的类型 id默认是用方法名做为id
    @Bean("xixi")
    public Person person222(){
        return new Person("王五", 19);
    }

2 测试