mapper包的编写

 controller采取全注解开发

@Controller//标注为一个控制器
@RequestMapping("/book")//设置高一级路径
public class BookController {
    @Autowired//自动装填
    @Qualifier("bookServiceImpl")//指定装填
    private BookService bookService;

    @RequestMapping("/findAll")//调用路径
    public String list(Model model){
        List<Books> allBooks = bookService.findAllBooks();
        model.addAttribute("bookList",allBooks);
        return "test";
    }

 service采用注解开发

@Component 注册bean到spring管理