Spring IOC Annotation 注入 学习实例

这个小程序主要是为了学习一下Spring annotation注入的写代码方式，另一个目的就是看一下spring是什么时候初始化Bean，实例化Bean,注入Bean的

1：导入Spring的jar包

2：添加ApplicationContext.xml配置文件，编写配置

3：编写User业务处理代码userBLL

package com.iocProject.userBLL;

import com.iocProject.dao.UserDao;

import javax.annotation.Resource;
import org.springframework.stereotype.Component;

@Component("userBLL")
public class UserBLL {
	private UserDao userDao;

	public UserBLL()
	{
		System.out.println("start construction UserBll");
	}
	
	public UserDao getUserDao() {
		return userDao;
	}

	@Resource  
	public void setUserDao(UserDao userDao) {
		System.out.println("start injection userDao");
		this.userDao = userDao;
	}
	
	public void addUser()
	{
		System.out.println("start to add user");
		this.userDao.AddUser();
	}
}

4:编写UserDao处理代码Dao

package com.iocProject.dao;

public interface UserDao {
	 void AddUser();
}

package com.iocProject.dao;

import org.springframework.stereotype.Component;

@Component 
public class UserDaoImpl implements UserDao{

	public UserDaoImpl()
	{
		System.out.println("start construction UserDao");
	}
	
	@Override
	public void AddUser() {
		// TODO Auto-generated method stub
		System.out.print("add user dao");
	}

}

5:写测试用例（只初始化ApplicationContex配置文件）观察结果

6:写测试用例获取Bean,调用Bean方法观察结果

7:可以发现Spirng在初始化ApplicationContex配置文件就已经实例化了Bean对象而且完成了注入

8：给出测试程序的实例，小弟初学，希望各位大神给出指正

http://download.csdn.net/detail/cjsy_2011/9713511