JavaWeb实现简单的图书管理系统

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介绍一下这个简单的项目包含了书籍展示、添加书籍以及删除书籍功能，虽然项目很简单，但是作为小白的我很想和大家分享互动，欢迎大家参考交流大神指教

下面展示我的主要功能代码，Dao模式：

这是Dao层的实现类：

package com.BookManage.Dao.impl;

import com.BookManage.Dao.BaseDao;
import com.BookManage.Dao.BookDao;
import com.BookManage.Entity.Book;
import com.BookManage.Util.ConnectionUtil;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class BookDaoImpl extends BaseDao implements BookDao {
    /**
     * 通过有参构造传入connection
     *
     * @param connection
     */
    public BookDaoImpl(Connection connection) {
        super(connection);
    }

    @Override
    public List getBook() throws Exception {
        //先创建sql语句
        String sql="select * from bookmanage";
        //创建结果集对象
        ResultSet resultSet=null;
        try{
            resultSet=doQuery(sql);
            //创建集合接收封装结果集的Book对象
            List bookList=new ArrayList<>();
            //循环读取resultSet，实例一个Book对象接收
            while (resultSet.next()){
                Book book=new Book();
                book.setB_id(resultSet.getInt("b_id"));
                book.setB_name(resultSet.getString("b_name"));
                book.setB_author(resultSet.getString("b_author"));
                book.setB_time(resultSet.getDate("b_time"));
                book.setB_type(resultSet.getInt("b_type"));
                bookList.add(book);
            }
            return bookList;
        }catch (Exception e){
            throw e;
        }finally {
            ConnectionUtil.closeAll(null,null,resultSet);
        }
    }

    @Override
    public int addBook(Book book) throws Exception {
        String sql="INSERT INTO `bookmanage` (`b_name`,`b_author`,`b_time`,`b_type`) VALUES(?,?,?,?)";
        //创建集合接收前端数据
        Object [] params={book.getB_name(),book.getB_author(),book.getB_time(),book.getB_type()};
        try {
            return doUpdate(sql,params);
        } catch (SQLException e) {
            throw e;
        }
    }

    @Override
    public int delBookById(int bid) throws SQLException {
        String sql ="delete from bookmanage where b_id=?";
        int result=0;
        try {
            Object[] params={bid};
            result=this.doUpdate(sql,params);
        } catch (SQLException e) {
            e.printStackTrace();
            throw e;
        }
        return result;
    }
}

 这是Service层的实现类：

package com.BookManage.Service.impl;

import com.BookManage.Dao.BookDao;
import com.BookManage.Dao.impl.BookDaoImpl;
import com.BookManage.Entity.Book;
import com.BookManage.Service.BookService;
import com.BookManage.Util.ConnectionUtil;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;

public class BookServiceImpl implements BookService {
    @Override
    public List getBook() {
        //获得数据库连接并传入BookDaoImpl
        Connection connection=ConnectionUtil.getConnection();
        BookDao bookDao=new BookDaoImpl(connection);
        try {
            return bookDao.getBook();
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            //关闭数据库连接
            ConnectionUtil.closeAll(connection,null,null);
        }
        return null;
    }

    @Override
    public boolean addBook(Book book) {
        Connection connection=ConnectionUtil.getConnection();
        BookDao bookDao=new BookDaoImpl(connection);
        try {
            return bookDao.addBook(book)>0;
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            ConnectionUtil.closeAll(connection,null,null);
        }
        return false;
    }

    @Override
    public boolean delBook(int bid) throws SQLException {
        Connection connection=null;
        try {
            connection=ConnectionUtil.getConnection();
            BookDao bd=new BookDaoImpl(connection);
            return bd.delBookById(bid)>0;
        } catch (SQLException e) {
            e.printStackTrace();
            throw e;
        }finally {
            ConnectionUtil.closeAll(connection,null,null);
        }
    }
}

 这是与实现与前端交互的Servlet：

package com.BookManage.Servlet;

import com.BookManage.Entity.Book;
import com.BookManage.Service.BookService;
import com.BookManage.Service.impl.BookServiceImpl;
import com.alibaba.fastjson.JSON;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.Console;
import java.io.IOException;
import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@WebServlet(name = "BookServlet",urlPatterns = "/BookServlet")
public class BookServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       doGet(req, resp);
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //接收操作请求
        String opr = req.getParameter("opr");
        resp.setContentType("application/json;charset=utf-8");
        BookService bookService=new BookServiceImpl();
        if ("all".equals(opr)) {
            List book = bookService.getBook();
            String json= JSON.toJSONStringWithDateFormat(book,"yyyy-MM-dd");
            resp.getWriter().print(json);
        }else if("add".equals(opr)){
            String bname=req.getParameter("bname");
            String bauthor=req.getParameter("bauthor");
            String btime=req.getParameter("btime");
            String btype=req.getParameter("btype");
            SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
            Date date=null;
            try {
                date=formatter.parse(btime);
                Book book=new Book(bname,bauthor,date,Integer.parseInt(btype));
                boolean result = bookService.addBook(book);
                Map stringHashMap = new HashMap();
                stringHashMap.put("result",result);
                String json=JSON.toJSONString(stringHashMap);
                resp.getWriter().print(json);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if("deleteBook".equals(opr)){
            String bid=req.getParameter("bid");
            System.out.print(bid);
            try {
                boolean result=bookService.delBook(Integer.parseInt(bid));
                Map stringHashMap = new HashMap();
                stringHashMap.put("result",result);
                String json=JSON.toJSONString(stringHashMap);
                resp.getWriter().print(json);
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}

前端用JSON实现前后端交互：

<%--
  Created by IntelliJ IDEA.
  User: DELL
  Date: 2021/7/4
  Time: 11:08
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>

  
    
  
  
  
  
图书信息
  

    

      
图书名称
      
图书作者
      
购买时间
      
图书分类
      
操作
    
    

  
  新增图书信息