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&useUnicode=true&characterEncoding=utf8&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;
@Data
public 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：
