图书管理系统( JSP + JDBC + Servlet)实现-07:模糊查询功能

Posted 2021-07-09 Z && Y

01: 流程分析和数据库建表阶段
02: 编写和配置过滤器（防止页面乱码）
03:项目搭建 & 工具类的实现 &依赖导入
04: 建立数据库的实体类（pojo）
05: 实现登录功能
06: 查询所有书籍功能
07:模糊查询功能
08:页面所有功能实现（附源码下载）

2.1 实现-07: 模糊查询功能

后面这些步骤都跟前面类型，以后就不做过多叙述了。

2.1.1 BookDao

BookDao.java

public List<Book> getBookByName(Connection connection, String bookName) throws Exception;
}

2.1.1 BookDaoImpl

BookDaoImpl.java

    @Override
    public List<Book> getBookByName(Connection connection, String bookName) throws Exception {
        PreparedStatement preparedStatement = null;
        ResultSet rs = null;
        Book book = null;
        List<Book> books = new ArrayList<>();
        if (null != connection) {
            String sql = "select * from books where bookName like ?";
            Object[] params = {"%" + bookName + "%"};
            rs = BaseDao.executeQuery(connection, preparedStatement, rs, sql, params);
            while (rs.next()) {
                book = new Book();
                book.setInventory(rs.getInt("inventory"));
                book.setBookName(rs.getString("bookName"));
                book.setBookId(rs.getString("bookId"));
                book.setAuthor(rs.getString("author"));
                books.add(book);
            }
            BaseDao.closeResource(connection, preparedStatement, rs);
        }
        return books;
    }

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2.1.3 创建 BookService

BookService.java

    public List<Book> getBookByName(String bookName) throws Exception;

2.1.4 创建 BookServiceImpl

BookServiceImpl.java

    @Override
    public List<Book> getBookByName(String bookName) throws Exception {
        Connection connection = BaseDao.getConnection();
        return new BookDaoImpl().getBookByName(connection, bookName);
    }

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2.1.5 创建 GetBookByNameServlet

GetBookByNameServlet.jsp

package com.tian.servlet.book;

import com.tian.pojo.Book;
import com.tian.service.book.BookServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

/**
 * ClassName: GetBookByNameServlet
 * Description:
 *
 * @author Tianjiao
 * @date 2021/5/29 23:45
 */
public class GetBookByNameServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 获取前端传递过来的书籍的信息
        String bookName = req.getParameter("bookName");
        BookServiceImpl bookService = new BookServiceImpl();
        try {
            List<Book> books = bookService.getBookByName(bookName);
            req.setAttribute("books", books);
            req.getRequestDispatcher("static/jsp/index.jsp").forward(req, resp);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req, resp);
    }
}

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2.1.6 配置 GetBookByNameServlet

web.xml

    <servlet>
        <servlet-name>GetBookByNameServlet</servlet-name>
        <servlet-class>com.tian.servlet.book.GetBookByNameServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>GetBookByNameServlet</servlet-name>
        <url-pattern>/getBooksByName</url-pattern>
    </servlet-mapping>

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2.1.7 启动服务器，测试

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