<dependencies>
  <dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis</artifactId>
   <version>3.3.0</version>
  </dependency>
  <!-- mysql驅(qū)動(dòng)包 
  	這個(gè)驅(qū)動(dòng)包要根據(jù)自己MySQL版本來配置不然就會(huì)出bug-->
  <dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <version>8.0.11</version>
  </dependency>
  <!-- junit測試包 -->
  <dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
   <version>4.11</version>
   <scope>test</scope>
  </dependency>
 </dependencies>

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

<configuration>
 <!-- 環(huán)境配置 -->
 <environments default="mysql">
  <!--配置mysql的環(huán)境-->
  <environment id="mysql">
   <!--配置事務(wù)的類型-->
   <transactionManager type="JDBC"></transactionManager>
   <!--配置連接池-->
   <dataSource type="POOLED">
    <property name="driver" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://localhost:3306/testuser?serverTimezone=Asia/Shanghai" />
    <property name="username" value="root" />
    <property name="password" value="li4918458" />
   </dataSource>
  </environment>
 </environments>
 <!-- mapping文件路徑配置 -->
 <mappers>
  <mapper resource="mapper/UserMapper.xml"/>
 </mappers>

</configuration>

<?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="pojo.User">
 <!--id ="接口中的方法名"
 　　parameterType="傳入的參數(shù)類型"
 　　resultType = "返回實(shí)體類對(duì)象，使用包.類名"-->

 <select id="findById" parameterType="int" resultType="pojo.User"> select * from user where id = #{id}

 </select> 
 </mapper>

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 org.junit.Test;
import pojo.User;

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

public class test {
@Test
public void testSearchById() throws IOException {
 //1.讀取配置文件
 InputStream in = Resources.getResourceAsStream("mybatis-config.xml");
 //2.創(chuàng)建SqlSessionFactory工廠
 SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
 //3.使用工廠生產(chǎn)SqlSession對(duì)象
 SqlSession session = sqlSessionFactory.openSession();
 //4.執(zhí)行Sql語句
 User user = session.selectOne("test.findUserById", 1);
 //5. 打印結(jié)果
 System.out.println(user);
 //6.釋放資源
 session.close();
 in.close();
}

 //根據(jù)用戶名模糊查詢用戶列表
 @Test
 public void testFindUserByUsername() throws IOException {
  //定義讀取文件名
  String resources = "mybatis-config.xml";
  //創(chuàng)建流
  Reader reader=null;
  try {
   //讀取mybatis-config.xml文件到reader對(duì)象中
   reader= Resources.getResourceAsReader(resources);
  } catch (IOException e) {
   e.printStackTrace();
  }
  //初始化mybatis,創(chuàng)建SqlSessionFactory類的實(shí)例
  SqlSessionFactory sqlMapper=new SqlSessionFactoryBuilder().build(reader);
  //創(chuàng)建session實(shí)例
  SqlSession session=sqlMapper.openSession();
  //傳入?yún)?shù)查詢，返回結(jié)果
  User user=session.selectOne("findById",1);
  //輸出結(jié)果
  System.out.println(user.getName());
  //關(guān)閉session
  session.close();
 }
}