jsp+简易图书管理系统

以下是一个简单的基于JSP和Servlet的图书管理系统的实现，包括添加、删除、修改和查询图书信息的功能：

1. 首先创建一个名为“book”的JavaBean类，用于存储图书信息，包括图书编号、图书名称、作者和价格等属性。

public class Book {
    private String id;
    private String name;
    private String author;
    private double price;

    // 构造方法
    public Book(String id, String name, String author, double price) {
        this.id = id;
        this.name = name;
        this.author = author;
        this.price = price;
    }

    // getter和setter方法
    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }
}

2. 创建一个名为“BookDao”的Java类，用于实现对图书信息的增删改查操作，包括添加图书、删除图书、修改图书和查询图书等方法。

public class BookDao {
    // 存储图书信息的List
    private static List<Book> bookList = new ArrayList<>();

    // 添加图书
    public static void addBook(Book book) {
        bookList.add(book);
    }

    // 删除图书
    public static void deleteBook(String id) {
        for (Book book : bookList) {
            if (book.getId().equals(id)) {
                bookList.remove(book);
                break;
            }
        }
    }

    // 修改图书
    public static void updateBook(Book book) {
        for (Book b : bookList) {
            if (b.getId().equals(book.getId())) {
                b.setName(book.getName());
                b.setAuthor(book.getAuthor());
                b.setPrice(book.getPrice());
                break;
            }
        }
    }

    // 查询图书
    public static Book getBook(String id) {
        for (Book book : bookList) {
            if (book.getId().equals(id)) {
                return book;
            }
        }
        return null;
    }

    // 获取所有图书
    public static List<Book> getAllBooks() {
        return bookList;
    }
}

3. 创建一个名为“BookServlet”的Servlet类，用于处理客户端的请求，包括添加图书、删除图书、修改图书和查询图书等操作。

@WebServlet("/book")
public class BookServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String action = request.getParameter("action");
        if ("add".equals(action)) {
            addBook(request, response);
        } else if ("delete".equals(action)) {
            deleteBook(request, response);
        } else if ("update".equals(action)) {
            updateBook(request, response);
        } else if ("get".equals(action)) {
            getBook(request, response);
        } else if ("getAll".equals(action)) {
            getAllBooks(request, response);
        }
    }

    // 添加图书
    private void addBook(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String id = request.getParameter("id");
        String name = request.getParameter("name");
        String author = request.getParameter("author");
        double price = Double.parseDouble(request.getParameter("price"));
        Book book = new Book(id, name, author, price);
        BookDao.addBook(book);
        response.sendRedirect("book.jsp");
    }

    // 删除图书
    private void deleteBook(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String id = request.getParameter("id");
        BookDao.deleteBook(id);
        response.sendRedirect("book.jsp");
    }

    // 修改图书
    private void updateBook(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String id = request.getParameter("id");
        String name = request.getParameter("name");
        String author = request.getParameter("author");
        double price = Double.parseDouble(request.getParameter("price"));
        Book book = new Book(id, name, author, price);
        BookDao.updateBook(book);
        response.sendRedirect("book.jsp");
    }

    // 查询图书
    private void getBook(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String id = request.getParameter("id");
        Book book = BookDao.getBook(id);
        request.setAttribute("book", book);
        request.getRequestDispatcher("book.jsp").forward(request, response);
    }

    // 获取所有图书
    private void getAllBooks(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        List<Book> bookList = BookDao.getAllBooks();
        request.setAttribute("bookList", bookList);
        request.getRequestDispatcher("book.jsp").forward(request, response);
    }
}

4. 创建一个名为“book.jsp”的JSP页面，用于显示图书信息和处理客户端的请求。

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图书管理系统</title>
</head>
<body>
    <h1>图书管理系统</h1>
    <hr>
    <h2>添加图书</h2>
    <form action="book?action=add" method="post">
        图书编号：<input type="text" name="id"><br>
        图书名称：<input type="text" name="name"><br>
        作者：<input type="text" name="author"><br>
        价格：<input type="text" name="price"><br>
        <input type="submit" value="添加">
    </form>
    <hr>
    <h2>删除图书</h2>
    <form action="book?action=delete" method="post">
        图书编号：<input type="text" name="id"><br>
        <input type="submit" value="删除">
    </form>
    <hr>
    <h2>修改图书</h2>
    <form action="book?action=update" method="post">
        图书编号：<input type="text" name="id"><br>
        图书名称：<input type="text" name="name"><br>
        作者：<input type="text" name="author"><br>
        价格：<input type="text" name="price"><br>
        <input type="submit" value="修改">
    </form>
    <hr>
    <h2>查询图书</h2>
    <form action="book?action=get" method="post">
        图书编号：<input type="text" name="id"><br>
        <input type="submit" value="查询">
    </form>
    <hr>
    <h2>所有图书</h2>
    <table border="1">
        <tr>
            <th>图书编号</th>
            <th>图书名称</th>
            <th>作者</th>
            <th>价格</th>
        </tr>
        <c:forEach items="${bookList}" var="book">
            <tr>
                <td>${book.id}</td>
                <td>${book.name}</td>
                <td>${book.author}</td>
                <td>${book.price}</td>
            </tr>
        </c:forEach>
    </table>
</body>
</html>