Spring 整合mybatis

1.导入依赖：

<dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.26</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.15</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.5</version>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.4</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
        </dependency>

2.配置静态资源过滤器

<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>

3.创建mybatis的配置文件

<?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>
    
//这里需要配置具体类的包 不然会报错 找不到该类
    <typeAliases>
        <package name="com.example.pojo"/>
    </typeAliases>

//这里配置一些连接信息
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/medical?useUnicode=true&amp;characterEncoding=utf-8"/>
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>

//配置对应的mapper.xml
    <mappers>
        <mapper class="com.example.mapper.UserMapper"/>
    </mappers>

</configuration>

4.创建实体类

@Data
public class User {
    String name;
    String password;
    int age;
}

5.创建接口类及其mapper.xml

public interface UserMapper {
    List<User> getUser();
}

<?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.example.mapper.UserMapper">
    <select id="getUser" resultType="User">
        select * from user ;
    </select>
</mapper>

6.测试

public static void main(String[] args) {
        String resource = "mybatis-config.xml";
        try {
            InputStream in = Resources.getResourceAsStream(resource);
            SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
            SqlSession sqlSession = factory.openSession(true);
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            List<User> user = mapper.getUser();
            for (User u :
                    user) {
                System.out.println(u.toString());

            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }