测试

package dao;

import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
import pojo.User;
import utils.myBatisUtils;

import java.util.List;

public class daotest {
    @Test
    public void test(){
        //第一步：获得sqlSession对象
        SqlSession sqlSession = myBatisUtils.getSqlSession();
        //方式一：getMapper
        UserDao mapper = sqlSession.getMapper(UserDao.class);
        List<User> userList = mapper.getUserList();
        for (User user : userList) {
            System.out.println(user);
        }

        //关闭sqlSession
        sqlSession.close();
    }
}

做一个接口

package dao;

import pojo.User;

import java.util.List;

public interface UserDao {
    List<User> getUserList();
}

工具类

package utils;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.IOException;
import java.io.InputStream;

/**
 * @author liu
 */
public class myBatisUtils {
   private static SqlSessionFactory sqlSessionFactory =null;
    static {
        //mybatis第一步，获取sqlSessionFactory对象
        try {
            String resource = "mybatis-config.xml";
            InputStream ips = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(ips);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
//既然有了sqlSessionFactory，顾名思义，可以创造SqlSession的实例
    //SqlSession完全包含了面向数据库的所有sql命令和方法
    public static SqlSession getSqlSession(){
return sqlSessionFactory.openSession();
    }

}

mybatis-3-config.xml

<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useUnicode=ture&amp;useSSL=true&amp;characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
    <!--每一个Mappper.XML都需要在MyBatis核心配置文件中注册-->
    <mappers>
        <mapper resource="UserDao.xml"/>
    </mappers>
</configuration>

userDao.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="dao.UserDao">
    <select id="getUserList" resultType="pojo.User">

        select * from myBatis.user where id="1";

    </select>


</mapper>

maven会过滤，需要加上配置

   <!--在build中配置resources，来防止我们资源导出失败的问题-->
  <!--  <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>-->