<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.zs</groupId><artifactId>mybatis</artifactId><version>1.0-SNAPSHOT</version><dependencies><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.4.6</version></dependency><dependency><groupId>com.mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.45-bin</version></dependency></dependencies></project>

package com.zs.entity;public class Login {private int id;private String username;private String password;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}@Overridepublic String toString() {return "Login{" +"id=" + id +", username='" + username + '\'' +", password='" + password + '\'' +'}';}
}

ackage com.zs.dao;import com.zs.entity.Login;/*** 创建登录的接口*/
public interface LoginDao {/*** 查询根据id查询用户信息*/Login getById(int id);}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration><environments default="mysql"><environment id="mysql"><transactionManager type="JDBC"></transactionManager><!--配置mybatis连接数据库的连接池信息--><dataSource type="POOLED"><!--配置数据库基本信息--><property name="driver" value="com.mysql.jdbc.Driver"/><property name="url" value="jdbc:mysql://localhost:3306/mybase?characterEncoding=utf-8"/><property name="username" value="root"/><property name="password" value="123456"/></dataSource></environment></environments><!--将项目的mappper文件配置进来--><mappers><mapper resource="mapper/login.xml"/></mappers>
</configuration>

<!DOCTYPE mapper PUBLIC "-//mybatis.org// Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zs.dao.LoginDao"><select id="getById" resultType="com.zs.entity.Login">select * from login where id=#{id}</select>
</mapper>

package com.zs.util;import com.sun.deploy.util.SessionProperties;
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;public class SqlSessionUtil {private static SqlSessionFactory sessionFactory;static {InputStream in = null;try {in = Resources.getResourceAsStream("mybatis-config.xml");sessionFactory=new SqlSessionFactoryBuilder().build(in);} catch (IOException e) {e.printStackTrace();}finally {try {in.close();} catch (IOException e) {e.printStackTrace();}}}public static SqlSession getSession(){return sessionFactory.openSession();}
}

import com.zs.dao.LoginDao;
import com.zs.entity.Login;
import com.zs.util.SqlSessionUtil;
import org.apache.ibatis.session.SqlSession;public class loginTest {public static void main(String[] args) {SqlSession session = SqlSessionUtil.getSession();LoginDao mapper = session.getMapper(LoginDao.class);Login byId = mapper.getById(1);System.out.println(byId);}
}