spring FactoryBean的知识应用和Beanfactory的区别

BeanFactory：是Spring的一个工厂它能够得到Spring工厂给创建的Bean，能通过getBean（）方法获得。

FactoryBean:是一个特殊的Bean,Spring管理它的时候会对实现这个接口的类前面加一个（&）字符。而它的名字则是表示getObject中得到的Bean。主要的作用是别的Bean属性或者依赖太多的情况下，都可以通过FactoryBean生成不太容易的Bean，然后对外提供简单化的Bean

public class TempDaoFactoryBean {public void test(){System.out.println("bean");} } /*** 如果你的类实现了FactoryBean* 那么Spring容器中会存在两个对象* 一个是getObject返回的对象* 一个是当前对象** getObject得到的名字是当前类指定的名字，也就是Spring中daoFactoryBean对应的对象** 当前对象是当前类的名字是“&”+当前类的名字** */ @Component("daoFactoryBean") public class DaoFactoryBean implements FactoryBean {public void testBean(){System.out.println("testBean");}public Object getObject() throws Exception {return new TempDaoFactoryBean();}public Class<?> getObjectType() {return null;}public boolean isSingleton() {return false;} }

依赖关系比较复杂的时候可以使用FactoryBean，例如SqlSessionFactoryBean，就是使用的Factory这种模式，对外进行简化它的庞大资源配置的。

简单一个例子来模拟庞大的复杂关系

package com.FactoryBeanPackage;import org.springframework.beans.factory.FactoryBean;public class DaoFactoryBean implements FactoryBean {private String msg;public void setMsg(String msg) {this.msg = msg;}public void testBean(){System.out.println("testBean");}public Object getObject() throws Exception {TempDaoFactoryBean temp=new TempDaoFactoryBean();String msgArrags[]=msg.split(",");temp.setMsg(msgArrags[0]);temp.setMsg2(msgArrags[1]);temp.setMsg3(msgArrags[2]);return temp;}public Class<?> getObjectType() {return null;}public boolean isSingleton() {return false;} } package com.FactoryBeanPackage;public class TempDaoFactoryBean {private String msg;private String msg2;private String msg3;public void setMsg(String msg) {this.msg = msg;}public void setMsg2(String msg2) {this.msg2 = msg2;}public void setMsg3(String msg3) {this.msg3 = msg3;}public String getMsg() {return msg;}public String getMsg2() {return msg2;}public String getMsg3() {return msg3;}public void test(){System.out.println("bean");} } package com.FactoryBeanPackage;import org.springframework.context.annotation.AnnotationConfigApplicationContext;public class Test {public static void main(String[] args) {AnnotationConfigApplicationContext act=new AnnotationConfigApplicationContext(SpringDaoFactoryConfig.class);TempDaoFactoryBean daoFactoryBean= (TempDaoFactoryBean) act.getBean("daoFactor");System.out.println(daoFactoryBean.getMsg());} } package com.FactoryBeanPackage;import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.ImportResource;@Configuration @ComponentScan(value = "com.FactoryBeanPackage") @ImportResource("classpath:spring.xml") public class SpringDaoFactoryConfig { }

 

 

 

 

 

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