使用FactoryBean方式将组件注入IOC容器

最新推荐文章于 2022-12-17 23:05:48 发布

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本文详细介绍了如何使用Spring框架中的FactoryBean接口创建自定义的bean实例。通过示例代码展示了pom.xml依赖配置、实体类定义、FactoryBean实现以及配置类和测试方法的编写过程。

1、pom.xml依赖

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.0.6.RELEASE</version>
</dependency>

2、实体类

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Person {
    private int id;
    private int age;
    private String name;
}

3、实现

import com.it.vo.Person;
import org.springframework.beans.factory.FactoryBean;

public class PersonFactoryBean implements FactoryBean<Person> {
    @Override
    public Person getObject() throws Exception {
        return new Person(1, 23, "张三");
    }

    @Override
    public Class<?> getObjectType() {
        return Person.class;
    }

    @Override
    public boolean isSingleton() {
        return true;
    }
}

import com.it.service.PersonFactoryBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class PersonConfig {
    @Bean
    public PersonFactoryBean personFactoryBean() {
        return new PersonFactoryBean();
    }
}

4、测试

import com.it.config.PersonConfig;
import com.it.vo.Person;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class PersonTest {
    public static void main(String [] args) {
        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(PersonConfig.class);
        Object personFactoryBean = applicationContext.getBean("personFactoryBean");
        if (personFactoryBean instanceof Person) {
            Person person = (Person) personFactoryBean;
            System.out.println(person);
        }
    }
}

//结果：Person(id=1, age=23, name=张三)