Spring(九)让Spring自动扫描和管理Bean

beans4.xml

        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

        xmlns:context="http://www.springframework.org/schema/context"

@Service用于标注业务层组件、@Controller用于标注控制层组件(如struts中的action)、@Repository用于标注数据访问组件，即DAO组件、@Component泛指组件，当组件不好归类的时候，可以用这个注解进行标注。

package test.spring.dao.impl;

import org.springframework.stereotype.Repository;

import test.spring.dao.PersonDao;

@Repository
public class PersonDaoBean implements PersonDao {

	@Override
	public void add(){
		System.out.println("执行PersonDaoBean里的test1()方法");
	}
}

package test.spring.service.impl;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Service;

import test.spring.dao.PersonDao;
import test.spring.service.PersonService2;

//@Service
//@Service("personService")

//通过注解的方式修改bean的作用域
//@Service("personService")
//@Scope("prototype")

@Service("personService")
public class PersonServiceBean6 implements PersonService2 {

	private PersonDao personDao;

	public PersonServiceBean6() {

	}

	// 通过@PostConstruct注解指定初始化的方法
	@PostConstruct
	public void init() {
		System.out.println("初始化");
	}

	// 在bean实例被摧毁之前会执行这个方法
	@PreDestroy
	public void destroy() {
		System.out.println("销毁");
	}

	public void setPersonDao(PersonDao personDao) {
		this.personDao = personDao;
	}

	@Override
	public void save() {
		personDao.add();
	}
}

package test.spring.jnit;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Scope;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import test.spring.dao.PersonDao;
import test.spring.service.PersonService2;

public class SpringTest5 {

	@Test
	public void testAutowired() {
		AbstractApplicationContext applicationContext = new ClassPathXmlApplicationContext(
				"beans4.xml");
		// PersonService2 personService = (PersonService2) applicationContext
		// .getBean("personServiceBean6");// bean的名称默认为类的简单名称
		// 原型 @Scope("prototype")
		PersonService2 personService1 = (PersonService2) applicationContext
				.getBean("personService");// bean的名称默认为类的简单名称
		// PersonService2 personService2 = (PersonService2) applicationContext
		// .getBean("personService");// bean的名称默认为类的简单名称
		System.out.println(personService1);
		// System.out.println(personService2);
		System.out.println("---------------------------");
		// PersonDao personDao = (PersonDao) applicationContext
		// .getBean("personDaoBean");
		// System.out.println(personDao);
		applicationContext.close();
	}

}

PersonServiceBean6的注解为prototype

PersonServiceBean6的注解改为单例（默认）

Spring(九)让Spring自动扫描和管理Bean

原文：http://blog.csdn.net/lindonglian/article/details/47047119