Sprngboot项目怎么整合mybatis和pagehelper

可以使用MyBatis的Spring Boot Starter和PageHelper的Spring Boot Starter来整合MyBatis和PageHelper。首先，在pom.xml文件中添加以下依赖项：

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.4</version>
</dependency>
<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper-spring-boot-starter</artifactId>
    <version>1.3.0</version>
</dependency>

然后，在application.properties文件中配置MyBatis和PageHelper：

mybatis.mapper-locations=classpath:mapper/*.xml
pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql

最后，在Spring Boot应用程序中使用@Mapper注释来标记MyBatis映射器接口，并在需要分页的方法中使用PageHelper.startPage方法来启用分页：

@Mapper
public interface UserMapper {
    List<User> findAll();

    @Select("SELECT * FROM user WHERE id = #{id}")
    User findById(@Param("id") Long id);

    @Insert("INSERT INTO user(name, age) VALUES(#{name}, #{age})")
    void save(User user);

    @Update("UPDATE user SET name = #{name}, age = #{age} WHERE id = #{id}")
    void update(User user);

    @Delete("DELETE FROM user WHERE id = #{id}")
    void delete(@Param("id") Long id);

    @Select("SELECT * FROM user")
    List<User> findByPage();
}

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    @Override
    public List<User> findAll() {
        return userMapper.findAll();
    }

    @Override
    public User findById(Long id) {
        return userMapper.findById(id);
    }

    @Override
    public void save(User user) {
        userMapper.save(user);
    }

    @Override
    public void update(User user) {
        userMapper.update(user);
    }

    @Override
    public void delete(Long id) {
        userMapper.delete(id);
    }

    @Override
    public PageInfo<User> findByPage(Integer pageNum, Integer pageSize) {
        PageHelper.startPage(pageNum, pageSize);
        List<User> userList = userMapper.findByPage();
        return new PageInfo<>(userList);
    }
}

以上就是整合MyBatis和PageHelper的步骤。