这篇文章主要讲解了“Spring整合MyBatis的实现方法是什么”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“Spring整合MyBatis的实现方法是什么”吧！
一、Spring 项目整体目录结构
二、Spring 整合 MyBatis 开发环境
Spring 整合 MyBatis 开发环境除了需要 Spring 的jar包和 MyBatis 的jar包，还需要 Spring 与 MyBatis 整合的中间件 mybatis-spring-xxx.jar，此外还需要数据库驱动jar包 mysql-connector-java-xxx.jar。
三、Mapper 接口无实现类开发整合
项目案例：Spring + MyBatis 实现对 user 数据库的查询。
实现步骤：
【1】创建一个 Maven 项目，然后再 pom.xml 文件中添加相关依赖
<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>cn.kgc.sm</groupId>
<artifactId>spring06</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>spring06</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<!--测试工具-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!--mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<!--druid-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.9</version>
</dependency>
<!--mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.9</version>
</dependency>
<!--IOC 依赖注入-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.3.9</version>
</dependency>
<!--mybatis&spring 整合包-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.5</version>
</dependency>
<!--aspects 切面-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.3.9</version>
</dependency>
<!--jdbc-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.3.9</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.3.9</version>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.16</version>
</dependency>
<!-- 日志工具-->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!--mybatis分页插件-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>5.2.1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.3.9</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>【2】在 resources —> config 目录下，创建数据库配置文件 jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///java2218?serverTimezone=UTC&useSSL=false&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=root【3】在 resources —> config 目录下，创建 MyBatis 配置文件 mybatis-config.xml
<?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>
<settings>
<setting name="logImpl" value="LOG4J"/>
<setting name="mapUnderscoreToCamelCase" value="true"/>
<!--全局开启二级缓存-->
<setting name="cacheEnabled" value="true"/>
</settings>
<!--配置mybatis分页插件-->
<plugins>
<plugin interceptor="com.github.pagehelper.PageInterceptor">
<!-- 配置mysql方言 -->
<property name="helperDialect" value="mysql" />
<!-- 设置为true时，如果pageSize=0就会查询出全部的结果 -->
<property name="pageSizeZero" value="true" />
<!-- 3.3.0版本可用，分页参数合理化，默认false禁用 -->
<!-- 启用合理化时，如果pageNum<1会查询第一页，如果pageNum>pages会查询最后一页 -->
<!-- 禁用合理化时，如果pageNum<1或pageNum>pages会返回空数据 -->
<property name="reasonable" value="true" />
</plugin>
</plugins>
</configuration>【4】在 resources —> config 目录下，创建 Spring 配置文件 spring-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<!--引入外部数据源的配置参数-->
<context:property-placeholder location="classpath:config/jdbc.properties"></context:property-placeholder>
<!--初始化数据库连接池-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="${jdbc.driver}"></property>
<property name="url" value="${jdbc.url}"></property>
<property name="username" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
<!--sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--设置数据库连接池-->
<property name="dataSource" ref="dataSource"></property>
<!--设置mybatis全局配置文件位置-->
<property name="configLocation" value="config/mybatis-config.xml"></property>
<!--设置别名的包-->
<property name="typeAliasesPackage" value="cn.kgc.sm"></property>
<!--设置mapper.xml文件的位置-->
<property name="mapperLocations" value="mapper/*.xml"></property>
</bean>
<!--mapper接口扫描 生成接口代理对象 同时完成对象的托管-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="cn.kgc.sm.mapper"></property>
</bean>
<!--开启包扫描 base-package 设置需要扫描的包 -->
<context:component-scan base-package="cn.kgc.sm"></context:component-scan>
</beans>【5】创建实体类 User
package cn.kgc.sm.entity;
import lombok.Data;
@Data
public class User {
private Integer uId;
private String uName;
private String uPassword;
private Integer uState;
}【6】创建 Mapper 接口 UserMapper
package cn.kgc.sm.mapper;
import cn.kgc.sm.entity.User;
import java.util.List;
public interface UserMapper {
List<User> selectAll();
}【7】创建与 UserMapper 接口映射的 UserMapper.xml 文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.kgc.sm.mapper.UserMapper">
<select id="selectAll" resultType="user">
select * from user
</select>
</mapper>【8】创建 Service 业务层接口 UserService
package cn.kgc.sm.service;
import cn.kgc.sm.entity.User;
import cn.kgc.sm.mapper.UserMapper;
import java.util.List;
public interface UserService {
List<User> selectAll();
}【9】创建 UserService 接口的实现类 UserServiceImpl
package cn.kgc.sm.service.impl;
import cn.kgc.sm.entity.User;
import cn.kgc.sm.mapper.UserMapper;
import cn.kgc.sm.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceImpl implements UserService {
@Autowired
UserMapper userMapper;
@Override
public List<User> selectAll() {
System.out.println("users = ");
List<User> users = userMapper.selectAll();
System.out.println("users = " + users);
return users;
}
}【10】创建测试类
package cn.kgc.sm.mapper;
import cn.kgc.sm.entity.User;
import cn.kgc.sm.service.UserService;
import junit.framework.TestCase;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import java.util.List;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:config/spring-config.xml")
public class UserMapperTest {
@Autowired
UserService userService;
@Test
public void Test01(){
List<User> users = userService.selectAll();
users.forEach(user -> System.out.println("user = " + user));
// for (User user : users) {
// System.out.println("user = " + user);
// }
}
}运行结果：