书籍管理项目部分源码

Controller 和视图层编写

1. BookController 类编写，方法一：查询全部书籍

@Controller
@RequestMapping("/book")
public class BookController { @Autowired @Qualifier("BookServiceImpl") private BookService bookService; @RequestMapping("/allBook") public String list(Model model) { List<Books> list = bookService.queryAllBook(); model.addAttribute("list", list); return "allBook"; } }

2. 编写首页 index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" %>
<!DOCTYPE HTML>
<html>
<head>
    <title>首页</title>
    <style type="text/css">
        a {
            text-decoration: none;
            color: black;
            font-size: 18px;
        }
        h3 {
            width: 180px;
            height: 38px;
            margin: 100px auto;
            text-align: center; line-height: 38px; background: deepskyblue; border-radius: 4px; } </style> </head> <body> <h3> <a href="${pageContext.request.contextPath}/book/allBook">点击进入列表 页</a> </h3> </body> </html>

3. 书籍列表页面 allbook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍列表</title>
    <meta name="viewport" content="width=device-width, initialscale=1.0">
    <!-- 引入 Bootstrap -->
    <link
            href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"
            rel="stylesheet">
</head>
<body>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>书籍列表 —— 显示所有书籍</small>
                </h1>
            </div>
        </div>
    </div>
    <div class="row">
        <div class="col-md-4 column">
            <a class="btn btn-primary"
               href="${pageContext.request.contextPath}/book/toAddBook">新增</a>
        </div>
    </div>
    <div class="row clearfix">
        <div class="col-md-12 column">
            <table class="table table-hover table-striped">
                <thead>
                <tr>
                    <th>书籍编号</th>
                    <th>书籍名字</th>
                    <th>书籍数量</th>
                    <th>书籍详情</th>
                    <th>操作</th>
                </tr>
                </thead>
                <tbody>
                <c:forEach var="book" items="${requestScope.get('list')}"> <tr> <td>${book.getBookID()}</td> <td>${book.getBookName()}</td> <td>${book.getBookCounts()}</td> <td>${book.getDetail()}</td> <td> <a href="${pageContext.request.contextPath}/book/toUpdateBook? id=${book.getBookID()}">更改</a> | <a href="${pageContext.request.contextPath}/book/del/${book.getBookID()}"> 删除</a> </td> </tr> </c:forEach> </tbody> </table> </div> </div> </div>

4. BookController 类编写，方法二：添加书籍

    @RequestMapping("/toAddBook")
    public String toAddPaper() {
        return "addBook";
    }
    @RequestMapping("/addBook")
    public String addPaper(Books books) {
        System.out.println(books);
        bookService.addBook(books);
        return "redirect:/book/allBook";
    }

5. 添加书籍页面：addBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>新增书籍</title>
    <meta name="viewport" content="width=device-width, initialscale=1.0">
    <!-- 引入 Bootstrap -->
    <link
            href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"
            rel="stylesheet">
</head>
<body>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>新增书籍</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/book/addBook"
          method="post">
        书籍名称：<input type="text" name="bookName"><br><br><br>
        书籍数量：<input type="text" name="bookCounts"><br><br><br>
        书籍详情：<input type="text" name="detail"><br><br><br>
        <input type="submit" value="添加">
    </form>
</div>

6. BookController 类编写，方法三：修改书籍

    @RequestMapping("/toUpdateBook")
    public String toUpdateBook(Model model, int id) {
        Books books = bookService.queryBookById(id);
        System.out.println(books);
        model.addAttribute("book",books );
        return "updateBook";
    }
    @RequestMapping("/updateBook")
    public String updateBook(Model model, Books book) {
        System.out.println(book);
        bookService.updateBook(book);
        Books books = bookService.queryBookById(book.getBookID());
        model.addAttribute("books", books);
        return "redirect:/book/allBook";
    }

7. 修改书籍页面 updateBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改信息</title>
    <meta name="viewport" content="width=device-width, initialscale=1.0">
    <!-- 引入 Bootstrap -->
    <link
            href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"
            rel="stylesheet">
</head>
<body>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>修改信息</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/book/updateBook"
          method="post">
        <input type="hidden" name="bookID" value="${book.getBookID()}"/>
        书籍名称：<input type="text" name="bookName"
                    value="${book.getBookName()}"/>
        书籍数量：<input type="text" name="bookCounts"
                    value="${book.getBookCounts()}"/>
        书籍详情：<input type="text" name="detail"
                    value="${book.getDetail() }"/>
        <input type="submit" value="提交"/>
    </form>
</div>

8. BookController 类编写，方法四：删除书籍

   @RequestMapping("/del/{bookId}")
    public String deleteBook(@PathVariable("bookId") int id) {
        bookService.deleteBookById(id);
        return "redirect:/book/allBook";
    }

项目结构图

实现查询书籍功能

1. 前端页面增加一个输入框和查询按钮

<div class="col-md-4 column"></div>
<div class="col-md-4 column">
    <form class="form-inline" action="/book/queryBook" method="post"
          style="float: right">
        <input type="text" name="queryBookName" class="form-control"
               placeholder="输入查询书名" required>
        <input type="submit" value="查询" class="btn btn-primary">
    </form>
</div>

2. 编写查询的Controller

  @RequestMapping("/queryBook")
    public String queryBook(String queryBookName,Model model){
        System.out.println("要查询的书籍:"+queryBookName);
//业务逻辑还没有写
        return "allBook";
    }

3. 由于底层没有实现，所以我们要将底层代码先搞定

4. Mapper接口

//根据id查询,返回一个Book
Books queryBookByName(String bookName);

5. Mapper.xml

<!--根据书名查询,返回一个Book-->
<select id="queryBookByName" resultType="Books">
select * from ssmbuild.books
where bookName = #{bookName}
</select>

6. Service接口

//根据id查询,返回一个Book
Books queryBookByName(String bookName);

7. Service实现类

public Books queryBookByName(String bookName) {
    return bookMapper.queryBookByName(bookName);
}

8. 完善Controller

   @RequestMapping("/queryBook")
    public String queryBook(String queryBookName,Model model){
        System.out.println("要查询的书籍:"+queryBookName);
        Books books = bookService.queryBookByName(queryBookName);
        List<Books> list = new ArrayList<Books>();
        list.add(books);
        model.addAttribute("list", list);
        return "allBook";
    }

9. 测试，查询功能OK！

10. 无聊优化！我们发现查询的东西不存在的时候，查出来的页面是空的，我们可以提高一下用户的体验性！

　　1. 在前端添加一个展示全部书籍的按钮

　　2. 并在后台增加一些判断性的代码！

  @RequestMapping("/queryBook")
    public String queryBook(String queryBookName,Model model){
        System.out.println("要查询的书籍:"+queryBookName);
//如果查询的数据存在空格，则优化
        Books books =
                bookService.queryBookByName(queryBookName.trim());
        List<Books> list = new ArrayList<Books>();
        list.add(books);
//如果没有查出来书籍，则返回全部书籍列表
        if (books==null){
            list = bookService.queryAllBook();
            model.addAttribute("error", "没有找到本书！");
        }
        model.addAttribute("list", list);
        return "allBook";
    }

　　3. 将错误信息展示在前台页面！完整的查询栏代码

<div class="row">
<div class="col-md-4 column">
    <a class="btn btn-primary"
       href="${pageContext.request.contextPath}/book/toAddBook">新增</a>
    <a class="btn btn-primary"
       href="${pageContext.request.contextPath}/book/allBook">显示全部书籍
    </a>
</div>
<div class="col-md-8 column">
    <form class="form-inline" action="/book/queryBook"
          method="post" style="float: right">
        <span style="color:red;font-weight: bold">${error}
        </span>
        <input type="text" name="queryBookName" class="formcontrol" placeholder="输入查询书名" required>
        <input type="submit" value="查询" class="btn btnprimary">
    </form>
</div>
</div>

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书籍管理项目部分源码

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