Spring(四)JavaBean作用范围的配置及生命周期

package test.spring.jnit;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import test.spring.service.impl.PersonServiceBean;

public class BeanScopeTest {

	@Test
	public void testScope() {
		ApplicationContext applicationContext = new ClassPathXmlApplicationContext(
				"beans.xml");
		// -------------------------------------------------
		PersonServiceBean personServiceBean1 = (PersonServiceBean) applicationContext
				.getBean("personService");
		PersonServiceBean personServiceBean2 = (PersonServiceBean) applicationContext
				.getBean("personService");

		System.out.println(personServiceBean1 == personServiceBean2);

	}
}

	<bean id="personService" class="test.spring.service.impl.PersonServiceBean"
		scope="prototype"></bean>

	<bean id="personService" class="test.spring.service.impl.PersonServiceBean"
		lazy-init="false" init-method="init" destroy-method="destroy"></bean>

package test.spring.service.impl;

import test.spring.service.PersonService;

public class PersonServiceBean implements PersonService {

	public void init(){
		System.out.println("初始化");
	}
	public PersonServiceBean(){
		System.out.println("现在实例化");
	}
	@Override
	public void save(){
		System.out.println("=============");
	}
	public void destroy() {
		System.out.println("释放资源");
	}
}

package test.spring.jnit;

import org.junit.Test;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class BeanScopeTest {

	@Test
	public void testScope() {
		// ApplicationContext applicationContext = new
		// ClassPathXmlApplicationContext(
		// "beans.xml");// 如果scope="singleton",现在对bean实例化
		// System.out.println("-------------------------------");
		/*
		 * 如果scope="prototype",现在对bean实例化。
		 * 如果scope="singleton"，通过设置lazy-init="true"延迟实 例化的时间，bean也在此时实例化。
		 */
		// PersonServiceBean personServiceBean1 = (PersonServiceBean)
		// applicationContext
		// .getBean("personService");
		// PersonServiceBean personServiceBean2 = (PersonServiceBean)
		// applicationContext
		// .getBean("personService");
		//
		// System.out.println(personServiceBean1 == personServiceBean2);//
		// 返回true
		AbstractApplicationContext abstractApplicationContext = new ClassPathXmlApplicationContext(
				"beans.xml");
		abstractApplicationContext.close();
	}
}

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