Spring整合Mybatis详细步骤

<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <settings>
        <!-- 开启日志 -->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
        <!-- 开启二级缓存 -->
        <setting name="cacheEnabled" value="true"/>
        <!-- 将经典的SQL字段映射为Java驼峰命名变量-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>

	<!-- 别名 -->
    <typeAliases>
        <typeAlias type="com.pojo.User" alias="User"/>
    </typeAliases>
	
	<!-- 映射注册 -->
    <mappers>
        <mapper class="com.dao.UserMapper"/>
    </mappers>

</configuration>

<?xml version="1.0" encoding="UTF8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">

    <context:component-scan base-package="com.dao"/>
    <context:annotation-config/>

    <!-- 1.将mybatis配置环境集成到spring中，交由Spring托管 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>

    <!-- 2. 将SqlSessionFactory交给Spring托管   -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" scope="singleton">
        <property name="dataSource" ref="dataSource"/>          <!-- 加载数据环境   -->
        <!--  绑定mybatis配置文件     -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!--   几乎所有的东西都能在这里面配，完全不需要mybatis的核心配置
               根据个人喜好，个人感觉分开一点维护比较容易
        -->
    </bean>

    <!--  3. 将SqlSession对象的加载交给Spring托管  -->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!-- 按照mybatis的习俗，通过工厂获得SqlSession会话对象       -->
        <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>

</beans>

package com.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@AllArgsConstructor
@NoArgsConstructor
@Data
public class User {

    private int id;
    private String username;
    private String password;
    
}

package com.dao;

import com.pojo.User;
import java.util.List;

public interface UserMapper {

    public List<User> getUserList();

}

<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.dao.UserMapper">

	<!-- 解决字段-属性不匹配问题 -->	
    <resultMap id="map" type="User">
        <id column="id" property="id"/>
        <id column="name" property="username"/>
        <id column="pwd" property="password"/>
    </resultMap>
    <select id="getUserList" resultMap="map">
        select *from user;
    </select>

</mapper>

import com.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository("userMapperImpl")
public class UserMapperImpl implements UserMapper{

    @Autowired
    private SqlSessionTemplate sqlSession;
    @Override
    public List<User> getUserList() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> list = mapper.getUserList();
        return list;
    }
}

import com.pojo.User;
import org.apache.ibatis.session.SqlSession;
import org.mybatis.spring.support.SqlSessionDaoSupport;

import java.util.List;

public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper{
    @Override
    public List<User> getUserList() {
        SqlSession sqlSession = getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> list = mapper.getUserList();
        return list;
    }
}

<bean id="userMapperImpl2" class="com.dao.UserMapperImpl2">
	<!-- SqlSessionDaoSupport抽象类需要注入依赖sqlSessionFactory  -->
    <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>

@Test
public void test1(){
    ApplicationContext context = new ClassPathXmlApplicationContext("application.xml");
    UserMapper userMapperImpl = context.getBean("userMapperImpl", UserMapper.class);
    List<User> list = userMapperImpl.getUserList();
    for (User user : list) {
        System.out.println(user.toString());
    }
}