实现查询书籍功能

编写一个控制类

package controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import pojo.Books;
import service.BookService;

import java.util.List;

@Controller
@RequestMapping("/book")
public class BookController {
    //controller调用service
    @Autowired//自动注入
    //当容器扫描到@Autowied 就会在IoC容器自动查找需要的bean，并装配给该对象的属性
    @Qualifier("BookServiceImpl")
    //指定注入哪个对象
    private BookService bookService;
    //查询全部书籍,并且返回到一个书籍展示界面
    @RequestMapping("/allBook")
    public String list(Model model){
        List<Books> list = bookService.queryAllbook();
        model.addAttribute("list",list);
        return "allBook";
    }
}