Spring实例化对象方式④.实现FactoryBean接口实例化：实例工厂变种：集成其他框架使用：SqlSessionFactoryBean

最新推荐文章于 2023-08-30 16:15:10 发布

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本文介绍了一种在Spring框架中使用FactoryBean接口实现自定义bean创建的方法。通过Employee4Factory类，展示了如何通过FactoryBean接口返回自定义的Employee4实例，并在App类中通过Spring的ApplicationContext获取并打印这个bean。

Employee4Factory.java：

package text.spring01._05_instance.factorybean;

import org.springframework.beans.factory.FactoryBean;

/**
 * Created by thinkpad on 2019/9/2.
 */
public class Employee4Factory implements FactoryBean{

    public Employee4 getObject(){

        System.out.println("实现了factorybean接口的创建对象方式....");
        return new Employee4();
    }

    public Class<?> getObjectType() {
        return Employee4.class;
    }
}

App.java：

package text.spring01._05_instance.factorybean;

import text.spring01._05_instance.instancefactory.Employee3;
import text.spring01._05_instance.instancefactory.Employee3Factory;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * Created by thinkpad on 2019/9/2.
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
public class App {


    @Autowired
    private ApplicationContext context;




    @Test
    public  void  testSpring(){
        Employee4 employee4 = context.getBean(Employee4.class);

        System.out.println(employee4);
    }
}

App-context.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="employee" class="text.spring01._05_instance.constructor.Employee"></bean>


    <bean id="employee4" class="text.spring01._05_instance.factorybean.Employee4Factory"/>

</beans>