04--组件注册-@Scope-设置组件作用域

import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.ComponentScans;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.context.annotation.Scope;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Service;

import com.ceshi.bean.PersonBean;
import com.ceshi.demo.MyFilterType;

//配置类==配置文件（xml）
@Configuration   //告诉Spring这个一个配制类
public class BeanConfig2 {
	
	
	/**
	 * Specifies the name of the scope to use for the annotated component/bean.
	 * <p>Defaults to an empty string ({@code ""}) which implies
	 * {@link ConfigurableBeanFactory#SCOPE_SINGLETON SCOPE_SINGLETON}.
	 * @since 4.2
	 * @see ConfigurableBeanFactory#SCOPE_PROTOTYPE
	 * @see ConfigurableBeanFactory#SCOPE_SINGLETON
	 * @see org.springframework.web.context.WebApplicationContext#SCOPE_REQUEST
	 * @see org.springframework.web.context.WebApplicationContext#SCOPE_SESSION
	 * @see #value
	 * singleton:单例
	 * prototype：多实例，IOC容器不会在启动的时候创建bean，而是在每次获取的时候创建bean
	 * request：同一次请求创建一个实例
	 * session：同一个session会话创建一个实例
	 * 
	 */
	@Scope("prototype")
	//给容器注册一个Bean，类型class：默认为返回值的类型，标识id：默认为方法名
	@Bean("person")
	public PersonBean personBean(){
		return new PersonBean("lishi","20");
	}
}

注意：IOC容器在创建bean的时候不会在启动的时候创建多实例bean，只会在使用的时候创建。