spring整合mybatis

1.创建一个maven工程

2.在pom.xml文件中配置好所需的各种依赖包

<?xml version="1.0" encoding="UTF-8"?>
<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">
    <parent>
  
        <artifactId>spring2</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>spring-mybatis</artifactId>
    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
      <!--导入mybatis依赖包-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
          <!--导入测试依赖包-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
          <!--导入mysql数据库相关操作包-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.18</version>
        </dependency>
          <!--导入mybatis-spring整合包-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>
          <!--导入spring相关操作依赖包-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.0.RELEASE</version>
        </dependency>
          <!--spring要操作数据库，得导入这个包-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.19.RELEASE</version>
        </dependency>
          <!--导入面向切面编程AOP依赖包-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.4</version>
        </dependency>
          <!--导入set，get注释依赖包-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.10</version>
        </dependency>
    </dependencies>
      <!--编写build文件，防止配置文件无法导出或生效的问题-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>
</project>

3.创建数据库表中相应的实体类

package com.zhu.pojo;

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

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private int id;
    private String name;
    private String pwd;
}

4.编写接口（需要操作数据库的方法）

package com.zhu.mapper;

import com.zhu.pojo.User;

import java.util.List;

public interface UserMapper {
//查询所有用户
    List<User> selectUser();
}

5.编写接口相对应的配置文件，编写方法对应的sql语句

<?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">
  <!--绑定UserMapper接口-->
<mapper namespace="com.zhu.mapper.UserMapper">
    <select id="selectUser" resultType="User">
        select * from mybatis.user
    </select>
</mapper>

6.配置mybatis核心文件

<?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>
    <typeAliases>
        <package name="com.zhu.pojo"/>
    </typeAliases>

</configuration>

7.配置spring核心文件

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
  <!--使用spring的数据源代替mybatis核心文件中的配置-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306"></property>
        <property name="username" value="root"></property>
        <property name="password" value="zhuminghua"></property>
    </bean>
  <!--生成sqlSessionFactory工厂对象-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
<!--绑定mybatis核心配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <property name="mapperLocations" value="classpath:com/zhu/mapper/*.xml"></property>

    </bean>
<!--生成sqlSessionTemplate对象，相当于mybatis中的sqlSession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
  <!--使用构造方法注入sqlSessionFactory，因为该类没有set方法-->
        <constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg>
    </bean>
  <!--生成UserMapperImpl对象-->
    <bean id="UserMapper" class="com.zhu.mapper.UserMapperImpl">
    <!--使用set方法注入sqlSession-->
        <property name="sessionTemplate" ref="sqlSession"></property>
    </bean>

</beans>

8.创建UserMapper接口的实现类

package com.zhu.mapper;

import com.zhu.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;

import java.util.List;

public class UserMapperImpl implements UserMapper{
    private SqlSessionTemplate sessionTemplate;

    public void setSessionTemplate(SqlSessionTemplate sessionTemplate) {
        this.sessionTemplate = sessionTemplate;
    }

    @Override
    public List<User> selectUser() {
        UserMapper userMapper = sessionTemplate.getMapper(UserMapper.class);
        return  userMapper.selectUser();
    }
}

9.将实现类注入到spring核心文件中，并且将属性赋值

<bean id="UserMapper" class="com.zhu.mapper.UserMapperImpl">
        <property name="sessionTemplate" ref="sqlSession"></property>
    </bean>

10.完成，进行测试

import com.zhu.mapper.UserMapper;
import com.zhu.mapper.UserMapperImpl;
import com.zhu.pojo.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


import java.io.IOException;
import java.io.InputStream;
import java.util.List;

public class MyTest {
    @Test
    public void test() throws IOException {

        ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");
        UserMapper mapper = context.getBean("UserMapper",UserMapper.class);
        List<User> userList = mapper.selectUser();
        for (User user:userList){
            System.out.println(user);
        }
    }
}

本文地址：https://blog.csdn.net/weixin_45723003/article/details/112002477