一、Spring整合Mybatis

1.1 整合Mybatis，原配置文件

<?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>
    <properties resource="jdbc.properties"></properties>
    <typeAliases>
        <package name="com.practice.domain"/>
    </typeAliases>
    <environments default="development">
        <environment id="mysql">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com.practice.dao"/>
    </mappers>
</configuration>

1.2整合后

package com.practice.config;

import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;

import javax.sql.DataSource;

/**
 * @Author YJ
 * @Date 2023/7/31 10:10
 * Description:Mybatis配置
 */
public class MybatisConfig {

    @Bean
    public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource) {
        SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean();
        ssfb.setTypeAliasesPackage("com.practice.domain");
        ssfb.setDataSource(dataSource);
        return ssfb;
    }
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer() {
        MapperScannerConfigurer msc = new MapperScannerConfigurer();
        msc.setBasePackage("com.practice.dao");
        return msc;
    }
}

1.3相关文件：

1.3.1jdbc配置文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/mybatis?useSSL=false
jdbc.userName=root
jdbc.password=123456

1.3.2jdbc配置类及spring配置类

package com.practice.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;

import javax.sql.DataSource;

/**
 * @Author YJ
 * @Date 2023/7/31 10:00
 * Description:Jdbc配置
 */
public class JdbcConfig {
    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.userName}")
    private String userName;
    @Value("${jdbc.password}")
    private String password;

    @Bean
    public DataSource dataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driver);
        dataSource.setUrl(url);
        dataSource.setUsername(userName);
        dataSource.setPassword(password);
        return dataSource;
    }
}

package com.practice.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;

/**
 * @Author YJ
 * @Date 2023/7/31 9:52
 * Description:
 */
@Configuration
@ComponentScan("com.practice")
@PropertySource("jdbc.properties")
@Import({JdbcConfig.class,MybatisConfig.class})
public class SpringConfig {
}

1.3.3数据库操作类

public interface UserDao {
    void save(User user);
    @Insert("insert into tb_user(id,username,password,gender,addr) values(#{id},#{username},#{password},#{gender},#{addr})")
    void insert(User user);
    @Delete("delete from tb_user where id=#{id}")
    void delete(Integer id);
    @Update("update tb_user set username=#{username} where id=#{id}")
    void update(User user);
    @Select("select * from tb_user")
    List<User> selectAll();
    @Select("select * from tb_user where id=#{id}")
    User selectById(Integer id);
}

public interface UserService {
    void save(User user);
    void update(User user);
    void delete(Integer id);
    User selectById(Integer id);
    List<User> selectAll();
}

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserDao userDao;
    public void save(User user) {
        userDao.save(user);
    }

    public void update(User user) {
        userDao.update(user);
    }

    public void delete(Integer id) {
        userDao.delete(id);
    }

    public User selectById(Integer id) {
        return userDao.selectById(id);
    }

    public List<User> selectAll() {
        return userDao.selectAll();
    }
}

1.3.4测试类

public class App2 {
    public static void main(String[] args) {
        ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        UserService bean = ctx.getBean(UserService.class);
        User user = bean.selectById(2);
        System.out.println(user);
    }
}

1.3.5运行结果

在这里插入图片描述

二、Spring整合JUnit

2.1使用Spring整合JUnit专用的类加载器

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)
public class UserServiceTest {
    @Autowired
    private UserService userService;
    @Test
    public void testSelectById() {
        System.out.println(userService.selectById(2));
    }
    @Test
    public void testSelectAll(){
        System.out.println(userService.selectAll());
    }
}