前言

spring整合mybaties的注解形式
xml形式如下:Spring整合myBaties – xml形式

第一步 在pom.xml中导入需要的坐标

<dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.3.12</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>RELEASE</version>
            <scope>compile</scope>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.8</version>
        </dependency>

        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.7.16</version>
        </dependency>

        <!--slf4j日志-->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.21</version>
        </dependency>

        <!--mysql连接驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>

        <!--druid-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.8</version>
        </dependency>

        <!--mybatis核心坐标-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.1</version>
        </dependency>

        <!--mybatis提供的与spring整合的坐标-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.1</version>
        </dependency>
        <!--tx-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.13.RELEASE</version>
        </dependency>

        <!--junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <!--spring整合junit坐标-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.2.13.RELEASE</version>
        </dependency>
    </dependencies>

第二步 创建实体类

import lombok.Data;

@Data
public class Student {
    private Integer id;
    private String name;
    private Integer age;
    private Integer score;
}

第三步 创建mapper类和service类

mapper

import com.guoliu.pojo.Student;
import org.apache.ibatis.annotations.Select;

import java.util.List;

public interface StudentMapper {
    @Select("select * from student")
    List<Student> findAll();
}

service

import com.guoliu.pojo.Student;

import java.util.List;

public interface StudentService {
    List<Student> findAll();
}

service实现类

import com.guoliu.mapper.StudentMapper;
import com.guoliu.pojo.Student;
import com.guoliu.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class StudentServiceImpl implements StudentService {
    @Autowired
    private StudentMapper studentMapper;

    public List<Student> findAll() {
        return studentMapper.findAll();
    }
}

第四步 编写配置类

druid.properties

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://192.168.23.129:3306/db7
jdbc.username=root
jdbc.password=itheima

SpringConfig

import com.alibaba.druid.pool.DruidDataSource;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.*;

import javax.sql.DataSource;

/*
* 核心配置类,代替xml
* */
@Configuration
//开启组件扫描
@ComponentScan("com.guoliu")
//引入配置文件
@PropertySource("druid.properties")
//引入子级文件
@Import(MapperConfig.class)
public class SpringConfig {
    @Value("${jdbc.driverClassName}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String username;
    @Value("${jdbc.password}")
    private String pwd;

    //声明获一个取数据源的方法
    @Bean
    public DataSource getDataSource(){
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driver);
        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(pwd);
        return dataSource;
    }

    //声明一个获取sqlSession工厂对象的方法
    @Bean
    public SqlSessionFactoryBean getSqlSessionFactoryBean(DataSource dataSource){
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource);
        sqlSessionFactoryBean.setTypeAliasesPackage("com.guoliu.pojo");
        return sqlSessionFactoryBean;
    }
}

MapperConfig

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

@Configuration
public class MapperConfig {
    //mapper代理对象:扫描器
    @Bean
    public MapperScannerConfigurer getMapperScannerConfigurer(){
        MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
        mapperScannerConfigurer.setBasePackage("com.guoliu.mapper");
        return mapperScannerConfigurer;
    }
}

第五步 测试

import com.guoliu.config.SpringConfig;
import com.guoliu.pojo.Student;
import com.guoliu.service.StudentService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import java.util.List;

public class controller{
    public static void main(String[] args) {
        ApplicationContext ac = new AnnotationConfigApplicationContext(SpringConfig.class);
        StudentService service = ac.getBean(StudentService.class);
        List<Student> list = service.findAll();
        System.out.println(list);
    }
}