SSM-基类-Service

多态中父类不能调用子类独有的属性和方法，如何间接使用?

1.BaseService基本接口

public interface BaseService<T> {
    
	//根据条件分页查询
    PageInfo<T> findPage(Map<String,String> filters);
    
	//增
    boolean insert(T t);

    //改
    boolean update(T t);
	
	//删
    boolean delete(Integer id);

    //查
    T findById(Integer id);
}

2.BaseServiceImpl实现类基类【父类】

public abstract class BaseServiceImpl<T> {
	
	/**
	*父类给子类安排一个必须实现的抽象方法，子类实现的时候把子类的属性带过来
	*/
    public abstract BaseMapper<T> getBaseMapper();



	//分页查询所有
    @Transactional(readOnly = true,propagation = Propagation.SUPPORTS)
    public PageInfo<T> findPage(Map<String, String> filters) {
        PageHelper.startPage(CastUtil.castInt(filters.get("pageNum"),1),CastUtil.castInt(filters.get("pageSize"),10));
		
        List<T> list = getBaseMapper().findPageList(filters);
		
        return new PageInfo<>(list,10);
    }
	
	//增
    @Transactional
    public boolean insert(T admin) {
        return getBaseMapper().insert(admin);
    }
	//改
    @Transactional
    public boolean update(T admin) {
        return getBaseMapper().update(admin);
    }
	//删
    @Transactional
    public boolean delete(Integer id) {
        return getBaseMapper().delete(id);
    }

	//查
    @Transactional(readOnly = true,propagation = Propagation.SUPPORTS)
    public T findById(Integer id) {
        return getBaseMapper().findById(id);
    }
}

3.具体Service实现类

@Service
public class AdminServiceImpl extends BaseServiceImpl<Admin> implements AdminService {
    
	//子类属性
	@Autowired
    private AdminMapper adminMapper;
	
	//实现父类安排的抽象方法，把属性传过去
    @Override
    public BaseMapper getBaseMapper() {
        return adminMapper;
    }
}