IOC操作Bean管理（FactoryBean）

1.Spring有两种类型bean，一种普通bean，另外一种工厂bean（FactoryBean）

2.普通bean：在配置文件中定义bean类型就是返回类型

3.工厂bean：在配置文件定义bean类型可以和返回类型不一样

第一步 创建类，让这个类作为工厂bean，实现接口FactoryBean

第二步 实现接口里面的方法，在实现的方法中定义返回的bean类型

package com.atguigu.spring.collectiontype;public class Course {private String cname;public void setCname(String cname) {this.cname = cname;}
}

package com.atguigu.spring.factoryBean;import com.atguigu.spring.collectiontype.Course;
import org.springframework.beans.factory.FactoryBean;public class MyBean implements FactoryBean<Course> {//定义返回bean@Overridepublic Course getObject() throws Exception {Course course = new Course();course.setCname("abc");return course;}@Overridepublic Class<?> getObjectType() {return null;}@Overridepublic boolean isSingleton() {return false;}
}

<?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 = "myBean" class = "com.atguigu.spring.factoryBean.MyBean"></bean></beans>

测试：

package com.atguigu.spring.test;import com.atguigu.spring.collectiontype.Book;
import com.atguigu.spring.collectiontype.Course;
import com.atguigu.spring.factoryBean.MyBean;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class testBook {@Testpublic void testCollection2(){ApplicationContext context = new ClassPathXmlApplicationContext("bean3.xml");Course myBean = context.getBean("myBean", Course.class);System.out.println(myBean);}}