package com.etc.dao;

import org.springframework.stereotype.Repository;

public class EntityDao {

	public String getData(){

		return "get data from database";

	}

}

package com.etc.service;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import com.etc.dao.EntityDao;

public class EntityService {

	private EntityDao entityDao;

	public String getData(){

		return entityDao.getData();

	}

}

package com.etc.config;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import com.etc.dao.EntityDao;

import com.etc.service.EntityService;

/** 声明当前类是一个配置类 ，在该类中定义bean*/

@Configuration

public class JavaConfig {

	/**获取dao的bean*/

	@Bean

	public EntityDao entityDao(){

		return new EntityDao();

	}

	/**获取service的bean*/

	// @Bean

	// public EntityService entityService(){

	// EntityService entityService=new EntityService();

	// entityService.setEntityDao(entityDao());

	// return entityService;

	// }

	/**获取serveice的bean时，通过方法参数注入bean*/

	@Bean

	public EntityService entityService(EntityDao entityDao){

		EntityService entityService=new EntityService();

		entityService.setEntityDao(entityDao);

		return entityService;

	}

}

package com.etc.test;

import org.junit.Test;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import com.etc.config.DiConfig;

import com.etc.config.JavaConfig;

import com.etc.service.EntityService;

public class TestClass {

	/**测试使用注解实现IOC*/

	public void test1() {

		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(

				DiConfig.class);

		EntityService es = context.getBean(EntityService.class);

		System.out.println(es.getData());

		context.close();

	}

	/**测试使用Java配置实现IOC*/

	@Test

	public void test2(){

		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(

				JavaConfig.class);

		EntityService es = context.getBean(EntityService.class);

		System.out.println(es.getData());

	}

}

get data from database