创建同一个类的多个bean对象，使用 @Qualifier(value = "createUserDao2")解决

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原创最新推荐文章于 2026-03-14 01:07:46 发布 7.8k 阅读 AI 写同款· GEO 优化 ›

批量添加Bean 批量添加Bean 除了使用@Component注解，或者@Configuration+@Bean注解添加Bean，还有一种方式可以批量添加Bean，就是使用@Import注解 @Import @Import注解添加在自定义的配置类上，在注解的属性中设置一个或多个需要添加的组件的Class类即可将这些组件添加到容器中首先我们定义三个类，并且不添加@Component注解 @Data @AllArgsConstructor @NoArgsConstructor public class Person { 阅读详情

通过@Bean注解将Bean注入spring容器

package com.edu.spring.config;/**
 * @author n00444323
 * @date 2019/1/15 12:12
 */

import com.edu.spring.config.bean.AnimalBean;
import com.edu.spring.config.bean.CatBean;
import com.edu.spring.config.bean.DogBean;
import com.edu.spring.config.factorybean.RunnableFactoryBean;
import com.edu.spring.mvcbean.UserController;
import com.edu.spring.mvcbean.UserDao;
import com.edu.spring.mvcbean.UserService;

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

/**
 * @param
 * @return
 * @throws
 */

@Configuration
public class MyConfig
{

    @Bean
    public UserDao createUserDao ()
    {
        return new UserDao();
    }

    @Bean
    public UserDao createUserDao2 ()
    {
        return new UserDao();
    }



}

package com.edu.spring.mvcbean;/**
 * @author n00444323
 * @date 2019/1/15 15:58
 */

import com.sun.org.apache.bcel.internal.generic.JSR;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

import java.lang.annotation.Inherited;

import javax.annotation.Resource;
import javax.inject.Inject;

import jdk.nashorn.internal.objects.annotations.Getter;
import jdk.nashorn.internal.objects.annotations.Setter;

/**
 * @param
 * @return
 * @throws
 */
@Service
public class UserService
{

    @Autowired
    @Qualifier(value = "createUserDao2")  //使用Qualifier指定bean对象
    private  UserDao userDao;


    @Resource  //JSR 250 提供的注入能力
    @Qualifier(value = "createUserDao2")
    private  UserDao userDao1;


    @Inject
    @Qualifier(value = "createUserDao2")
    private  UserDao userDao2;

    private  void show(){
        System.out.println("UserService...userDao");
    }

    @Override
    public String toString()
    {
        return "UserService{" +
                "userDao=" + userDao +
                ", userDao1=" + userDao1 +
                ", userDao2=" + userDao2 +
                '}';
    }
}

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