<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>5.1.26</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.2</version></dependency><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.12</version></dependency></dependencies>

public class User implements Serializable {private Integer id;private String username;private String password;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 String getPassword() {return password;}public void setPassword(String password) {this.password = password;}@Overridepublic String toString() {return "User{" +"id=" + id +", username='" + username + '\'' +", password='" + password + '\'' +'}';}

<?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>
<!--    配置环境--><environments default="mysql">
<!--        配置mysql环境--><environment id="mysql">
<!--            配置事务--><transactionManager type="JDBC"></transactionManager>
<!--            配置连接池--><dataSource type="POOLED"><property name="driver" value="com.mysql.jdbc.Driver"/><property name="url" value="jdbc:mysql://localhost:3306/javaweb1"/><property name="username" value="root"/><property name="password" value="123456"/></dataSource></environment></environments><!--    配置映射文件的位置--><mappers><mapper resource="dao/IUserDao.xml"></mapper></mappers>
</configuration>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><!--namespace确定方法在哪个Dao接口，id指的是哪个方法,resultType封装至哪-->
<mapper namespace="dao.IUserDao">
<!--    查询所有操作--><select id="findAll" resultType="dao.IUserDao">select * from web1;</select>
</mapper>

public interface IUserDao {/*** @return*/List<User> findAll();
}

public class MybatisTest {/*测试查询所有*/@Testpublic void testFindall() throws Exception{//1.读取配置文件，生成字节输入流InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");//2.获取SqlSessionFactorySqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);//3.获取sqlsession对象SqlSession sqlSession = factory.openSession();//4.获取dao的代理对象IUserDao userDao = sqlSession.getMapper(IUserDao.class);//5执行查询所有方法List<User> users = userDao.findAll();for (User user:users){System.out.println(user);}//释放资源
        sqlSession.close();in.close();}
}

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