首先應(yīng)先創(chuàng)建maven工程
（jar包要導(dǎo)入,五個核心jar包）

如果測試運行時出現(xiàn)了不支持版本5，則要修改以下內(nèi)容


類的路徑如下

1.配置pom.xml依賴

<?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.itheima</groupId><artifactId>day01_eesy_01mybatis</artifactId><version>1.0-SNAPSHOT</version><packaging>jar</packaging><dependencies><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.4.5</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.6</version></dependency><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.12</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.10</version></dependency></dependencies> </project>

1.創(chuàng)建User類

package com.itheima.domain;import java.io.Serializable; import java.util.Date;public class User implements Serializable {private Integer id;private String username;private Date birthday;private String sex;private String address;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}@Overridepublic String toString() {return "User{" +"id=" + id +", username='" + username + '\'' +", birthday=" + birthday +", sex='" + sex + '\'' +", address='" + address + '\'' +'}';} }

2.創(chuàng)建IUserDao接口

package com.itheima.interfaces;import com.itheima.domain.User; import org.apache.ibatis.annotations.Select;import java.util.List;public interface IUserDao {/*** 查詢所有操作*/ // @Select("select * from User")List<User> findAll(); }

3.配置SqlMapConfig.xml文件（注意開頭的mybatis約束不要忘記）

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"> <!--mybatis的主配置文件--> <configuration><!--配置環(huán)境--><environments default="mysql"><!--配置mysql的環(huán)境--><environment id="mysql"><!--配置事務(wù)類型--><transactionManager type="JDBC"></transactionManager><!--配置數(shù)據(jù)源（連接池)--><dataSource type="POOLED"><!--配置數(shù)據(jù)庫連接的4個基本信息--><property name="driver" value="com.mysql.cj.jdbc.Driver"/><property name="url" value="jdbc:mysql://127.0.0.1:3306/eesy?serverTimezone=UTC&amp;characterEncoding=utf-8&amp;useSSL=false"/><property name="username" value="xxxxxxx"/><property name="password" value="xxxxxxx"/></dataSource></environment></environments><!--使用注解配置--> <!-- <mappers>--> <!-- <mapper class="com.itheima.dao.IUserDao"/>--> <!-- </mappers>--><!--指定映射配置文件的位置，映射配置文件指的是每個dao獨立的配置文件--><mappers><mapper resource="com/itheima/dao/IUserDao.xml"></mapper></mappers> </configuration>

4.配置映射文件IUserDao.xml

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.itheima.interfaces.IUserDao"><!--配置查詢所有--><select id="findAll" resultType="com.itheima.domain.User">select *from user</select> </mapper>

5.創(chuàng)建測試類

package com.itheima.test; import com.itheima.domain.User; import com.itheima.interfaces.IUserDao;import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import org.apache.log4j.lf5.util.Resource;import java.io.IOException; import java.io.InputStream; import java.util.List;public class MybatisTest {public static void main(String[] args) throws IOException {//1.讀取配置文件InputStream in= Resource.class.getResourceAsStream("/SqlMapConfig.xml");//2.創(chuàng)建SqlSessionFactory工廠SqlSessionFactoryBuilder builder=new SqlSessionFactoryBuilder();SqlSessionFactory factory=builder.build(in);//3.使用工廠生產(chǎn)SqlSession對象SqlSession session = factory.openSession();//4.使用sqlSession創(chuàng)建Dao接口代理對象IUserDao userDao = session.getMapper(IUserDao.class);//5.使用代理對象執(zhí)行方法List<User> users=userDao.findAll();for (User user :users) {System.out.println(user);}//6.釋放資源session.close();in.close();} }

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