首先往pom文件中加入配置以获取jar包

<dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>

编写一个Mybatis的主配置文件

<?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>
    <!--配置环境-->
    <environments default="development">
        <environment id="development">
            <!--jdbc事务-->
            <transactionManager type="JDBC"/>
            <!--连接池-->
            <dataSource type="POOLED">
                <!--驱动-->
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <!--数据库链接-->
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=UTF-8"/>
                <!--用户名-->
                <property name="username" value="root"/>
                <!--密码-->
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <!--映射文件-->
        <mapper resource="com/hw/entity/Student.xml"/>
    </mappers>
</configuration>

创建实体类和实体类的配置文件

package com.hw.entity;
/**
 * @program: Maven
 * @description:
 * @author: hw
 * @create: 2019-01-01 00:42
 **/
public class Student {
    private Integer sid;
    private String sname;
    private Integer tid;
    public Student() {
        super();
    }
    public Student(String sname, Integer tid) {
        this.sname = sname;
        this.tid = tid;
    }
    public Student(Integer sid, String sname, Integer tid) {
        this.sid = sid;
        this.sname = sname;
        this.tid = tid;
    }
    @Override
    public String toString() {
        return "Student{" +
                "sid=" + sid +
                ", sname='" + sname + '\'' +
                ", tid=" + tid +
                '}';
    }
    public Integer getSid() {
        return sid;
    }
    public void setSid(Integer sid) {
        this.sid = sid;
    }
    public String getSname() {
        return sname;
    }
    public void setSname(String sname) {
        this.sname = sname;
    }
    public Integer getTid() {
        return tid;
    }
    public void setTid(Integer tid) {
        this.tid = tid;
    }
}
<?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="student">
    <!--根据id查-->
    <!-- id  statement的id 唯一
     parameterType   传入类型
     resultType   单个查询返回结果类型
     #{}    一个占位符
     #{id}  该占位符等待接收参数的名称为Id
     -->
    <select id="findStudentById" resultType="com.hw.entity.Student" parameterType="int">
        select * from student where sid=#{id}
    </select>
    <!--根据名字模糊查询-->
    <!--
    ${}     表示拼接sql字符串
    ${value}    表示拼接的是简单类型参数
    1.如果参数为简单类型时,${}里面的参数名称必须为value 固定写法
    2.${}为引起sql注入,一般不推荐使用,但某些情况下必须使用,如order by ${name}
    -->
    <select id="findStudentByName" parameterType="String" resultType="com.hw.entity.Student">
        select * from student where sname like '%${value}%'
    </select>
    <!--添加-->
    <!--占位符对应对象属性-->
    <insert id="addStudent" parameterType="com.hw.entity.Student">
        insert  into student (sname,tid)
        values (#{sname},#{tid});
    </insert>
    <!--删除-->
    <delete id="delStudent" parameterType="int">
      delete from student where sid =#{id}
    </delete>
    <!--修改-->
    <update id="editStudent" parameterType="com.hw.entity.Student">
      update student set sname=#{sname},tid=#{tid} where sid =#{sid};
    </update>
</mapper>

测试:

package com.hw.test;
import com.hw.entity.Student;
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.After;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
/**
 * @program: Maven
 * @description:
 * @author: hw
 * @create: 2019-01-01 01:12
 **/
public class Demo1 {
    InputStream inputStream;
    SqlSessionFactory build;
    SqlSession sqlSession;
    @Before
    public void before() {
        try {
            //读取配置文件
            inputStream = Resources.getResourceAsStream("Mybatis.xml");
            //通过sqlsessionFactoryBuilder创建sqlsessionFactory会话工厂
            build = new SqlSessionFactoryBuilder().build(inputStream);
            //通过sqlsessionFactory创建sqlsession
            sqlSession = build.openSession();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    @After
    public void after() {
        //关闭sqlsession
        sqlSession.commit();
        sqlSession.close();
    }
    /**
     * @Description: 查询
     * @Param: []
     * @return: void
     * @Author: hw
     * @Date: 2019/1/1
     */
    @Test
    public void test1() throws IOException {
        //调用sqlsession的操作数据库的方法
//        Student student=sqlSession.selectOne("findStudentById",1);
        List<Student> findStudentByName = sqlSession.selectList("findStudentByName", "1");
        findStudentByName.forEach(x -> System.out.println(x));
        //关闭sqlsession
        sqlSession.close();
    }
    /**
     * @Description: 添加
     * @Param: []
     * @return: void
     * @Author: hw
     * @Date: 2019/1/1
     */
    @Test
    public void test2() {
        Student student = new Student("猴子", 1);
        int addStudent = sqlSession.insert("addStudent", student);
        System.out.println(addStudent);
    }
    /**
     * @Description: 删除
     * @Param: []
     * @return: void
     * @Author: hw
     * @Date: 2019/1/1
     */
    @Test
    public void test3() {
        System.out.println(sqlSession.delete("delStudent", 2));
    }
    /**
     * @Description: 修改
     * @Param:
     * @return:
     * @Author: hw
     * @Date: 2019/1/1
     */
    @Test
    public void test4(){
        Student student=new Student(1,"李箐",2);
        System.out.println(sqlSession.update("editStudent",student));
    }
}