@Test
public void test() throws SQLException {
	Connection conn=null;
	PreparedStatement pstmt=null;
	try {
		// 1.加载驱动
		Class.forName("com.mysql.jdbc.Driver");
		// 2.创建连接
		conn= DriverManager.
		getConnection("jdbc:mysql://localhost:3306/mybatis_example", "root", "123456");
		// SQL语句
		String sql="select id,user_name,create_time from t_user where id=?";
		// 获得sql执行者
		pstmt=conn.prepareStatement(sql);
		pstmt.setInt(1,1);
		// 执行查询
		pstmt.execute();
		ResultSet rs= pstmt.getResultSet();
		rs.next();
		User user =new User();
		user.setId(rs.getLong("id"));
		user.setUserName(rs.getString("user_name"));
		user.setCreateTime(rs.getDate("create_time"));
		System.out.println(user.toString());
	} catch (Exception e) {
		e.printStackTrace();
	}finally{
		// 关闭资源
		try {
			if(conn!=null){
				conn.close();
			}
			if(pstmt!=null){
				pstmt.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
}

public class App {
	public static void main(String[] args) {
		String resource = "mybatis‐config.xml";
		Reader reader;
		try {
			//将XML配置文件构建为Configuration配置类
			reader = Resources.getResourceAsReader(resource);
			// 通过加载配置文件流构建一个SqlSessionFactory DefaultSqlSessionFactory
			SqlSessionFactory sqlMapper = new SqlSessionFactoryBuilder().build(reader);
			// 数据源 执行器 DefaultSqlSession
			SqlSession session = sqlMapper.openSession();
			try {
				// 执行查询 底层执行jdbc
				//User user = (User)session.selectOne("com.tuling.mapper.selectById", 1);
				UserMapper mapper = session.getMapper(UserMapper.class);
				System.out.println(mapper.getClass());
				User user = mapper.selectById(1L);
				System.out.println(user.getUserName());
			} catch (Exception e) {
 				e.printStackTrace();
 			}finally {
 				session.close();
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

public class App {
	public static void main(String[] args) {
		String resource = "mybatis‐config.xml";
		Reader reader;
		try {
			//将XML配置文件构建为Configuration配置类
			reader = Resources.getResourceAsReader(resource);
			// 通过加载配置文件流构建一个SqlSessionFactory DefaultSqlSessionFactory
			SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
			// 数据源 执行器 DefaultSqlSession
			SqlSession session = sqlSessionFactory.openSession();
			try {
				// 执行查询 底层执行jdbc
				//User user = (User)session.selectOne("com.tuling.mapper.selectById", 1);
				UserMapper mapper = session.getMapper(UserMapper.class);
				System.out.println(mapper.getClass());
				User user = mapper.selectById(1L);
				System.out.println(user.getUserName());
			} catch (Exception e) {
 				e.printStackTrace();
 			}finally {
 				session.close();
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}