关于@Autowired @Qualifier的用法：

BookController:

package com.kakafa.controller;

import com.kakafa.pojo.Books;
import com.kakafa.service.BookService;
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 java.util.List;

@Controller
@RequestMapping("/book")
public class BookController {

    @Autowired  //在属性中使用 @Autowired 注解来除去 setter 方法
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    //查询所有书籍
    @RequestMapping("/allbook")
    public String list(Model model){
        List books=bookService.queryAllBook();
        model.addAttribute("list",books);
        return "allBook";
    }



}

index.jsp:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

  
    
  
  
 

   进入书籍展示页面
 
  

allBook.jsp:

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    


书籍展示


            

    

        
书籍编号
        
书籍数量
        
书籍名称
        
书籍详情
    

       

                
${book.bookID}
                
${book.bookCounts}
                
${book.bookName}
                
${book.detail}
            
       

报错：
Could not open ServletContext resource [/database.properties]

spring-mapper.xml修改如下：