详解Spring如何整合Mybatis

第一步

导入相关jar包

<dependencies>    <!--连接mysql-->    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->    <dependency>        <groupId>mysql</groupId>        <artifactId>mysql-connector-java</artifactId>        <version>8.0.21</version>    </dependency>     <!--加载mybatis-->    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->    <dependency>        <groupId>org.mybatis</groupId>        <artifactId>mybatis</artifactId>        <version>3.4.6</version>    </dependency>     <!--junit测试-->    <!-- https://mvnrepository.com/artifact/junit/junit -->    <dependency>        <groupId>junit</groupId>        <artifactId>junit</artifactId>        <version>4.13.2</version>        <scope>test</scope>    </dependency>     <!--spring-webmvc-->    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->    <dependency>        <groupId>org.springframework</groupId>        <artifactId>spring-webmvc</artifactId>        <version>5.3.8</version>    </dependency>     <!--spring-jdbc spring连接数据库必备包-->    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->    <dependency>        <groupId>org.springframework</groupId>        <artifactId>spring-jdbc</artifactId>        <version>5.3.8</version>    </dependency>     <!-- aspectjweaver - 在spring中使用动态代理-->    <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver-->    <dependency>        <groupId>org.aspectj</groupId>        <artifactId>aspectjweaver</artifactId>        <version>1.9.6</version>    </dependency>     <!--mybatis与spring整合的包-->    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->    <dependency>        <groupId>org.mybatis</groupId>        <artifactId>mybatis-spring</artifactId>        <version>2.0.6</version>    </dependency>     <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->    <dependency>        <groupId>org.projectlombok</groupId>        <artifactId>lombok</artifactId>        <version>1.18.20</version>        <scope>provided</scope>    </dependency> </dependencies><!--下边配置：不管放在哪里的资源文件都会被编译--><build>    <resources>        <resource>            <directory>src/main/resources</directory>            <includes>                <include>**/*.properties</include>                <include>**/*.xml</include>            </includes>            <filtering>true</filtering>        </resource>        <resource>            <directory>src/main/java</directory>            <includes>                <include>**/*.properties</include>                <include>**/*.xml</include>            </includes>            <filtering>true</filtering>        </resource>    </resources></build>

第二步

编写配置文件

resources下：spring-config.xml，此配置文件下，连接数据库，创建SqlSessionFactory

<beans xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:context="http://www.springframework.org/schema/context"       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">    <!--第一步：安装依赖包-->    <!--        第二步：        安装完依赖，使用Spring来管理数据源：        DriverManagerDataSource        使用Spring的数据源替换Mybatis的配置，这里我们使用Spring提供的JDBC    -->    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver" />        <property name="url" value="jdbc:mysql://127.0.0.1:3306/java_pro?serverTimezone=Asia/Shanghai&amp;useUnicode=true&amp;characterEncoding=utf8&amp;useSSL=false" />        <property name="username" value="root" />        <property name="password" value="lvxingchen" />    </bean>    <!--创建sqlSessionFactory-->    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">        <!--注入数据源，dataSource 就是上边我们配置的id="dataSource" -->        <property name="dataSource" ref="dataSource" />        <!--绑定mybatis配置文件-->        <property name="configLocation" value="classpath:mybatis-config.xml" />        <property name="mapperLocations" value="classpath:com/lxc/dao/UserMapper.xml" />    </bean>    <!--创建sqlSession，SqlSessionTemplate 就是我们使用的sqlSession-->    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">        <!--只能通过构造器注入sqlSessionFactory，因为没有set方法-->        <constructor-arg index="0" ref="sqlSessionFactory" />    </bean>     <!-- 把接口实现类 UserMapperImp 注入到spring中-->    <bean id="userMapper" class="com.lxc.dao.UserMapperImp">        <property name="sqlSessionTemplate" ref="sqlSession"/>    </bean></beans>

mybatis-config.xml，下边 mybatis 的配置在上边 spring-config.xml 也可以，但是为了更加清晰，职责明确，把别名配置放在了mybatis-config.xml 中配置了。

<?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--><configuration>    <!--别名配置-->    <typeAliases>        <package name="com.lxc.domain" />    </typeAliases></configuration>

实体类User

package com.lxc.domain; import lombok.Data; @Datapublic class User {    private String name;    private String password;}

UserMapper 接口

package com.lxc.dao; import com.lxc.domain.User;import java.util.List; public interface UserMapper {    public List<User> getList();}

UserMapperImp 实现接口

package com.lxc.dao; import com.lxc.domain.User;import org.mybatis.spring.SqlSessionTemplate; import java.util.List;// 《实现接口的类 UserMapperImp》// 需要把这个类注入到Spring中去。public class UserMapperImp implements UserMapper{    // 我们所有操作都是用sqlSession 来执行的    private SqlSessionTemplate sqlSession;    public void setSqlSession(SqlSessionTemplate sqlSession) {        this.sqlSession = sqlSession;    }    @Override    public List<User> getList() {        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);        return userMapper.getList();    }}

UserMapper.xml

<?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="com.lxc.dao.UserMapper">    <select id="getList" resultType="User">        select * from mybatis    </select></mapper>

第三步

测试

import com.lxc.dao.UserMapper;import com.lxc.domain.User;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext; public class Test {    @org.junit.Test    public void test() {        ApplicationContext ctx = new ClassPathXmlApplicationContext("spring-config.xml");        UserMapper userMapper = ctx.getBean("userMapper", UserMapper.class);        for (User item : userMapper.getList()) {            System.out.println(item);        }    }}

输出：

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