基于javaweb+mysql的jsp+servlet网上图书馆管理系统(java+jsp+servlert+mysql+ajax)
由于提供的查询过于复杂,并且涉及到多个不同的功能,我将提供一个简化的示例来说明如何使用JSP、Servlet和MySQL来实现一个简单的图书借阅查询功能。
假设我们有一个简单的图书借阅数据库,包含图书信息和借阅记录。以下是实现查询的基本步骤:
- 创建数据库和表:
CREATE DATABASE library;
USE library;
CREATE TABLE books (
id INT AUTO_INCREMENT PRIMARY KEY,
title VARCHAR(255) NOT NULL,
author VARCHAR(255) NOT NULL
);
CREATE TABLE loans (
id INT AUTO_INCREMENT PRIMARY KEY,
book_id INT,
reader_id INT,
loan_date DATE,
FOREIGN KEY (book_id) REFERENCES books(id),
FOREIGN KEY (reader_id) REFERENCES readers(id)
);
- 创建一个Servlet来处理查询请求:
@WebServlet("/loan-query")
public class LoanQueryServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String bookTitle = request.getParameter("title");
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
// 建立数据库连接
conn = DriverManager.getConnection("jdbc:mysql://localhost/library", "username", "password");
// 准备SQL查询
String sql = "SELECT b.title, b.author, l.loan_date FROM books b INNER JOIN loans l ON b.id = l.book_id WHERE b.title = ?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, bookTitle);
// 执行查询并处理结果
rs = pstmt.executeQuery();
List<Loan> loans = new ArrayList<>();
while (rs.next()) {
Loan loan = new Loan();
loan.setTitle(rs.getString("title"));
loan.setAuthor(rs.getString("author"));
loan.setLoanDate(rs.getDate("loan_date"));
loans.add(loan);
}
// 将结果设置到request属性中,以便JSP页面使用
request.setAttribute("loans", loans);
} catch (SQLException e) {
e.printStackTrace();
} finally {
// 关闭资源
...
}
// 请求转发到JSP页面
request.getRequestDispatcher("/loanQuery.jsp").forward(request, response);
}
}
- 创建一个JSP页面来显示查询结果:
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title>Loan Query</title>
</head>
<body>
<h2>Loan Query Results</h2>
<ul>
<c:forEach var="loan" items="${loans}">
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