<!--配置通用Mapper start-->
    <dependency>
      <groupId>tk.mybatis</groupId>
      <artifactId>mapper-spring-boot-starter</artifactId>
      <version>2.1.5</version>
    </dependency>
    <!--通用Mapper end-->

@Repository
public interface UserDao extends Mapper<User> {
}

@Service("userService")
public calss UserServiceImpl implements UserService{
  @Autowired
  private UserDao userDao;
  @Override
  public List<User> list(){
  return userDao.selectALL();
  }
}

import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
public class User {
	@Id
	  @GeneratedValue(strategy = GenerationType.IDENTITY)
	  private Integer id;
	private String name;
	private Integer age;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
}

import tk.mybatis.spring.annotation.MapperScan;//把MapperScan的導入路徑換成tk.mybatis.spring.annotation.MapperScan
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.transaction.annotation.EnableTransactionManagement;
@SpringBootApplication
@EnableTransactionManagement //開啟書屋管理注解模式 最新的版本可以省略
@MapperScan("com.xz.springboot.mapper") //掃描該包下所有的接口并為該接口生成實現(xiàn)類
public class Springboot01Application {

  public static void main(String[] args) {
    SpringApplication.run(Springboot01Application.class, args);
  }
}