spring-注解---IOC(3)

    spring--注解---IOC(3)

 

 

package com.zwj.bean;public class Blue {public Blue(){System.out.println("blue...constructor");}public void init(){System.out.println("blue...init...");}public void detory(){System.out.println("blue...detory...");}
}

package com.zwj.bean;import org.springframework.stereotype.Component;@Component
public class Car {public Car(){System.out.println("car constructor...");}public void init(){System.out.println("car ... init...");}public void detory(){System.out.println("car ... detory...");}}

package com.zwj.bean;public class Color {private Car car;public Car getCar() {return car;}public void setCar(Car car) {this.car = car;}@Overridepublic String toString() {return "Color [car=" + car + "]";}}

package com.zwj.bean;import org.springframework.beans.factory.FactoryBean;//创建一个Spring定义的FactoryBean
public class ColorFactoryBean implements FactoryBean<Color> {//返回一个Color对象，这个对象会添加到容器中
    @Overridepublic Color getObject() throws Exception {// TODO Auto-generated method stubSystem.out.println("ColorFactoryBean...getObject...");return new Color();}@Overridepublic Class<?> getObjectType() {// TODO Auto-generated method stubreturn Color.class;}//是单例？//true：这个bean是单实例，在容器中保存一份//false：多实例，每次获取都会创建一个新的bean；
    @Overridepublic boolean isSingleton() {// TODO Auto-generated method stubreturn false;}}

package com.zwj.bean;public class RainBow {}

package com.zwj.bean;public class Yellow {}

package com.zwj.condition;import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.type.AnnotationMetadata;import com.zwj.bean.RainBow;public class MyImportBeanDefinitionRegistrar implements ImportBeanDefinitionRegistrar {/*** AnnotationMetadata：当前类的注解信息* BeanDefinitionRegistry:BeanDefinition注册类；*         把所有需要添加到容器中的bean；调用*         BeanDefinitionRegistry.registerBeanDefinition手工注册进来*/@Overridepublic void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {boolean definition = registry.containsBeanDefinition("com.zwj.bean.Yellow");boolean definition2 = registry.containsBeanDefinition("com.zwj.bean.Blue");if(definition && definition2){//指定Bean定义信息；（Bean的类型，Bean。。。）RootBeanDefinition beanDefinition = new RootBeanDefinition(RainBow.class);//注册一个Bean，指定bean名registry.registerBeanDefinition("rainBow", beanDefinition);}}}

package com.zwj.condition;import org.springframework.context.annotation.ImportSelector;
import org.springframework.core.type.AnnotationMetadata;//自定义逻辑返回需要导入的组件
public class MyImportSelector implements ImportSelector {//返回值，就是到导入到容器中的组件全类名//AnnotationMetadata:当前标注@Import注解的类的所有注解信息
    @Overridepublic String[] selectImports(AnnotationMetadata importingClassMetadata) {// TODO Auto-generated method stub//importingClassMetadata//方法不要返回null值return new String[]{"com.zwj.bean.Blue","com.zwj.bean.Yellow"};}}

package com.zwj.config;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.Lazy;
import org.springframework.context.annotation.Scope;import com.zwj.bean.Car;
import com.zwj.bean.Color;
import com.zwj.bean.ColorFactoryBean;
import com.zwj.condition.MyImportBeanDefinitionRegistrar;
import com.zwj.condition.MyImportSelector;@Configuration
@Import({Car.class,MyImportSelector.class,MyImportBeanDefinitionRegistrar.class})
//@Import导入组件，id默认是组件的全类名
public class MainConfig2 {/*** 给容器中注册组件；* 1）、包扫描+组件标注注解（@Controller/@Service/@Repository/@Component）[自己写的类]* 2）、@Bean[导入的第三方包里面的组件]* 3）、@Import[快速给容器中导入一个组件]*         1）、@Import(要导入到容器中的组件)；容器中就会自动注册这个组件，id默认是全类名*         2）、ImportSelector:返回需要导入的组件的全类名数组；*         3）、ImportBeanDefinitionRegistrar:手动注册bean到容器中* 4）、使用Spring提供的 FactoryBean（工厂Bean）;*         1）、默认获取到的是工厂bean调用getObject创建的对象*         2）、要获取工厂Bean本身，我们需要给id前面加一个&*             &colorFactoryBean*/@Beanpublic ColorFactoryBean colorFactoryBean(){return new ColorFactoryBean();}}

package com.zwj.test;import static org.junit.Assert.*;import org.junit.Test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;import com.zwj.bean.Blue;
import com.zwj.config.MainConfig2;public class IOCTest {AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfig2.class);@Testpublic void testImport(){printBeans(applicationContext);Blue bean = (Blue) applicationContext.getBean(Blue.class);System.out.println(bean);//工厂Bean获取的是调用getObject创建的对象Object bean2 = applicationContext.getBean("colorFactoryBean");Object bean3 = applicationContext.getBean("colorFactoryBean");System.out.println("bean的类型："+bean2.getClass());System.out.println(bean2 == bean3);Object bean4 = applicationContext.getBean("&colorFactoryBean");System.out.println(bean4.getClass());}private void printBeans(AnnotationConfigApplicationContext applicationContext){String[] definitionNames = applicationContext.getBeanDefinitionNames();for (String name : definitionNames) {System.out.println(name);}}}/*mainConfig2
com.zwj.bean.Car
com.zwj.bean.Blue
com.zwj.bean.Yellow
colorFactoryBean
rainBow
com.zwj.bean.Blue@341b80b2
ColorFactoryBean...getObject...
ColorFactoryBean...getObject...
bean的类型：class com.zwj.bean.Color
false
class com.zwj.bean.ColorFactoryBean*/

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.zwj</groupId><artifactId>spring-annotation_IOC</artifactId><version>0.0.1-SNAPSHOT</version><dependencies><!-- https://mvnrepository.com/artifact/org.springframework/spring-context --><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>4.3.12.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/junit/junit --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope></dependency></dependencies>
</project>