MyBatis代理实现

1、接口   UserDao.java

package dao;

import java.util.List;

import model.User;

public interface UserDao {
	public User findUserById(int id);
	public List<User> findUserByName(String name);
}

2、没有接口的实现类，有Mapper代理实现类

3、Mapper（代理）的使用方式：

        SqlSession session = MyBatisUtils.getFactory().openSession();
		//用session获取了一个Mapper代理、代理帮我们实现了接口中的方法
		UserDao mapper = session.getMapper(UserDao.class);
		List<User> users = mapper.findUserByName("张");

4、工具类：

太费、瞎着急

package utils;

import java.io.IOException;
import java.io.InputStream;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class MyBatisUtils {
	private static SqlSessionFactory factory = null;
	static {
		try {
			
			InputStream in = Resources.getResourceAsStream("mybatis.xml");
			factory = new SqlSessionFactoryBuilder().build(in);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	public static SqlSessionFactory getFactory() {
		return factory;
	}
}