JavaWeb 简单的图书管理系统(jsp+servlet)

package Jdbc.Tool;
import java.io.Console;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class BookManageOper {
    //创建数据与数据库的连接的字符常量 修改数据库仅需修改url中的bookmanage即可
    //connector8.x中已经进行修改classname与url，详细请前往其他教程寻找
    private static final String classname="com.mysql.jdbc.Driver";
    //mysql5.x不需要?后面的内容 但我是8.x并且用的时connector5 所以需要加？后的内容
    private static final String url="jdbc:mysql://localhost:3306/bookmanage?useUnicode=true&amp;characterEncoding=utf8";
    private static final String user="root";
    private static final String pwd="123456";
    //创建与数据库的连接 返回Connection连接对象
    public static Connection create(){
        //首先创建一个Connection对象 并赋值为null
        Connection connection=null;
        try{
            //为Connection对象赋值(获取连接)
            Class.forName(classname);
            connection=DriverManager.getConnection(url,user,pwd);
        }catch (Exception ex){
            //当发生错误时在控制台(Console)中输出错误信息 
            //并显示Tool - BookManageOper - create() Error
            ex.printStackTrace();
            System.out.println("Tool - BookManageOper - create() Error");
        }
        //返回connection对象
        return  connection;
    }
    //通过三个对象关闭数据库的连接
    public static void close(Connection connection, PreparedStatement preparedStatement, ResultSet resultSet){
        try{
            //如果不为空则进行关闭 为空则跳过
            if(connection!=null){
                connection.close();
            }else if(preparedStatement!=null){
                preparedStatement.close();
            }else if(resultSet!=null){
                resultSet.close();
            }
        }catch (Exception ex){
            ex.printStackTrace();
            System.out.println("Tool - BookManageOper - close(C,P,R) Error");
        }
    }
}

(2.2)src – jdbc – Tool – Page[翻页][工具类]

package Jdbc.Tool;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class Page {
    //当前页数 默认为1
    private int thisPage=1;
    //总页数
    private int sumPage;
    //每页显示行数{固定为5 修改的时候修改5为x即可}
    private int showPage=5;
    //所有记录数 可以使用这个来进行代替sumpage？ 【未实现】
    private int sumRecord;
    
    //单例模式
    private Page(){

    }

    private static Page page=null;

    public static Page getPage(){
        if(page==null)
            page=new Page();
        return page;
    }

    //私有的字段 用于数据库连接与操作
    private Connection connection=null;
    private PreparedStatement preparedStatement=null;
    private ResultSet resultSet=null;

    //在这里我没有给sumRecord创建get/set方法 因为没有外部类使用到他
    //如果有使用的需求可以加上 没有需求可以把sumRecord直接删除 在下方sum定义局部变量

    public int getThisPage() {
        return thisPage;
    }
    
    //当设置当前页数时，进行判断
    public void setThisPage(int thisPage) {
        //如果大于0且小于等于总页数，正常运行
        if(thisPage>0&amp;&thisPage<=sumPage){
            this.thisPage=thisPage;
        }
        //如果当前页数大于总页数，那么跳转到最后一页(设置为总页数)
        else if(thisPage>sumPage){
            this.thisPage=getSumPage();
        }
        //如果都不满足(小于0) 那么设为默认值1
        else{
            this.thisPage=1;
        }
    }

    public int getSumPage() {
        return sumPage;
    }
    
    //当设置总页数时，进行判断
    public void setSumPage(int sumPage) {
        //当总页数大于0时 进行赋值 否则将sumPage设为1(可以不设else 那么出现<0时SumPage不变)
        if(sumPage>0){
            this.sumPage = sumPage;
            //当总页数设置完之后，需要将当前页数设为当前页数
            //因为当删除数据之后 4页变成了3页 那么当前页数不能继续为4 而是为最大页数3
            this.setThisPage(this.getThisPage());
        }else{
            this.sumPage = 1;
        }
    }

    public int getShowPage() {
        return showPage;
    }

    public void setShowPage(int showPage) {
        //这里可以不进行判断，因为没在外面设置ShowPage
        //但是有些页面需要进行每页显示的修改 如论坛
        //需要进行每页显示的修改时需要进行判断
        if(showPage>=1&&showPage<=99){
            this.showPage = showPage;
        }
    }

    //获取总记录数 初始化或每次添加、删除结束后执行
    public void loadSumRecord(){
        System.out.println("Tool - Page - getSumPage()");
        try{
            //创建Connection连接
            connection=BookManageOper.create();
            //查询Book表的所有记录
            String sql="select count(1) from book";
            preparedStatement=connection.prepareStatement(sql);
            resultSet=preparedStatement.executeQuery();
            //因为是返回count(1)[只返回一个数据] 所以使用if
            if(resultSet.next()){
                sumRecord=resultSet.getInt(1);
                //三目运算符 if?true:false 当总记录除总页数余0时 返回结果，不为0返回结果+1
                this.setSumPage(sumRecord%showPage==0?sumRecord/showPage:sumRecord/showPage+1);
            }
        }catch (Exception ex){
            ex.printStackTrace();
        }finally {
            BookManageOper.close(connection,preparedStatement,resultSet);
        }
    }
}

(3)src – jdbc – Entity

Entity进行表与其中字段的定义，这就没必要解释了

(3.1)src – jdbc – Entity – Book[图书][实体类]

package Jdbc.Entity;

public class Book {
    //图书 mysql - BookManage . Book
    //图书编号
    private int id;
    //图书名
    private String name;
    //作者名
    private String author;
    //购入时间
    private String time;
    //图书类型 - Type类 包含id(类型编号)与name(类型名)
    private Type type;

    public int getId() {
        return id;
    }

    public void setId(int 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 String getTime() {
        return time;
    }

    public void setTime(String time) {
        this.time = time;
    }

    public Type getType() {
        return type;
    }

    public void setType(Type type) {
        this.type = type;
    }
}

(3.2)src – jdbc – Entity – Type[类型][实体类]

package Jdbc.Entity;

public class Type {
    //图书类型 mysql - BookManage . Type
    //图书类型编号
    private int id;
    //图书类型名
    private String name;
    //无参构造方法
    public Type(){

    }
    //有参构造方法 方便赋值 不用再进行type.setId()...
    public Type(int id, String name) {
        this.id = id;
        this.name = name;
    }

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

(4)src – jdbc – Dao

Dao中包含了方法的定义，需要什么方法就写什么方法

接口中的方法默认使用abstract修饰，不可以有方法体

但可以使用 default把ab str act覆盖掉

(4.1)src – jdbc – Dao – BookDao[图书][Dao接口]

package Jdbc.Dao;

import Jdbc.Entity.Book;

import java.util.List;

public interface BookDao {
    //获取所有书籍数据 Book - index.jsp/selectServlet -
    List<Book> getAllBook();
    //增加一条数据 Book - insert.jsp/insertServlet -
    boolean insertBook(String name,String author,String time,int type);
    //删除一条数据 Book - index.jsp/deleteServlet -
    boolean deleteBook(int id);
}

(4.2)src – jdbc – Dao – TypeDao[类型][Dao接口]

package Jdbc.Dao;

import Jdbc.Entity.Type;

import java.util.List;

public interface TypeDao {
    //获取所有类型信息 Type - insert.jsp/Servlet -
    List<Type> getAllType();
}

(5)src – jdbc – Impl

Impl通过implements Dao 来实现Dao中的抽象方法

impl一般来说都是默认类不会是接口或抽象类因为没有意义

(5.1)src – jdbc – Impl – BookDaoImpl(BookDao)[图书][Dao接口实现类]

package Jdbc.Impl;

import Jdbc.Dao.BookDao;
import Jdbc.Entity.Book;
import Jdbc.Entity.Type;
import Jdbc.Tool.BookManageOper;
import Jdbc.Tool.Page;

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

public class BookDaoImpl implements BookDao {
    //连接数据库与处理sql
    Connection connection=null;
    PreparedStatement preparedStatement=null;
    ResultSet resultSet=null;
    @Override
    public List<Book> getAllBook() {//获取所有书籍数据
        //当获取书籍时 首先重新加载一下记录
        Page page=Page.getPage();
        page.loadSumRecord();
        //先创建一个List 之后直接Return List
        List<Book> bookList=new ArrayList<>() ;
        try{
            connection=BookManageOper.create();
            //查询图书表中的x-x行数据 并查询它对应的类型名
            String sql="select b.*,t.* from book b,type t where b.type=t.id limit ?,?";
            preparedStatement=connection.prepareStatement(sql);
            // row * ( page - 1 )     5 * (2-1) = 5 不在前五行
            int Limit1=page.getShowPage()*(page.getThisPage()-1);
            preparedStatement.setInt(1, Limit1);
            preparedStatement.setInt(2, page.getShowPage());
            resultSet=preparedStatement.executeQuery();
            //返回不确定行或多行的查询sql语句 使用while
            while (resultSet.next()){
                 //创建一个book对象 并将数据库中的值赋给这个对象
                 Book book=new Book();
                 book.setId(resultSet.getInt("b.id"));
                 book.setName(resultSet.getString("b.name"));
                 book.setAuthor(resultSet.getString("b.author"));
                 book.setTime(resultSet.getString("b.time"));
                 book.setType(new Type(resultSet.getInt("t.id"),resultSet.getString("t.name")));
                 //将当前对象加入到list中
                 bookList.add(book);
            }
            System.out.println("Impl - BookDaoImpl - getAllBook() ReturnListCount : "+bookList.size());
        }catch (Exception ex){
            ex.printStackTrace();
            System.out.println("Impl - BookDaoImpl - getAllBook() Error");
        }finally {
            BookManageOper.close(connection,preparedStatement,resultSet);
        }
        return bookList;
    }

    @Override
    public boolean insertBook(String name,String author,String time,int type) {//添加一条数据
        boolean Return=false;
        try{
            connection=BookManageOper.create();
            //增加一条数据 因为id为自增 所以会自动赋值
            String sql="insert into book(name,author,time,type) values (?,?,?,?)";
            preparedStatement=connection.prepareStatement(sql);
            preparedStatement.setString(1,name);
            preparedStatement.setString(2,author);
            preparedStatement.setString(3,time);
            preparedStatement.setInt(4,type);
            //执行返回影响行数的sql使用Update
            int ReturnInt=preparedStatement.executeUpdate();
            //返回行数大于0则成功
            if(ReturnInt>0)
                Return=true;
            System.out.println("Impl - BookDaoImpl - insertBook(s,s,s,i) Return : "+Return);
        }catch (Exception ex){
            ex.printStackTrace();
            System.out.println("Impl - BookDaoImpl - insertBook(s,s,s,i)");
        }finally {
            BookManageOper.close(connection,preparedStatement,resultSet);
        }
        return Return;
    }

    @Override
    public boolean deleteBook(int id) {//删除一条数据
        boolean Return=false;
        try{
            connection=BookManageOper.create();
            //根据id删除一条数据 因为id是唯一的
            String sql="delete from book where id=?";
            preparedStatement=connection.prepareStatement(sql);
            preparedStatement.setInt(1,id);
            int ReturnInt=preparedStatement.executeUpdate();
            if(ReturnInt>0)
                Return=true;
            System.out.println("Impl - BookDaoImpl - insertBook(s,s,s,i) Return : "+Return);
        }catch (Exception ex){
            ex.printStackTrace();
            System.out.println("Impl - BookDaoImpl - deleteBook(s) Error");
        }finally {
            BookManageOper.close(connection,preparedStatement,resultSet);
        }
        return Return;
    }
}

(5.2)src – jdbc – Impl – TypeDaoImpl(TypeDao)[类型][Dao接口实现类]

package Jdbc.Impl;

import Jdbc.Dao.TypeDao;
import Jdbc.Entity.Type;
import Jdbc.Tool.BookManageOper;

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

public class TypeDaoImpl implements TypeDao {
    Connection connection=null;
    PreparedStatement preparedStatement=null;
    ResultSet resultSet=null;
    @Override
    public List<Type> getAllType() {//获取所有的图书类型
        List<Type> typeList = new ArrayList<>();
        try{
            connection=BookManageOper.create();
            String sql="select * from type";
            preparedStatement=connection.prepareStatement(sql);
            resultSet=preparedStatement.executeQuery();
            while (resultSet.next()){
                Type type=new Type();
                type.setId(resultSet.getInt("id"));
                type.setName(resultSet.getString("name"));
                typeList.add(type);
            }
            System.out.println("Impl - TypeDaoImpl - getAllType() - ReturnListCount : "+typeList.size());
        }catch (Exception ex){
            ex.printStackTrace();
            System.out.println("Impl - TypeDaoImpl - getAllType() Error");
        }finally {
            BookManageOper.close(connection,preparedStatement,resultSet);
        }
        System.out.println("Impl - TypeDaoImpl - getAllType() 完成");
        System.out.println();
        return typeList;
    }
}

- web && src – Servlet

(1)web – web _inf

(1.1)web – web _inf – web.xml[Web配置文件]

web.xml是web程序的配置文件，它很重要！！！没有配置web.xml的话会报大错

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <!--启动时的欢迎页面 修改只需要修改welcome-file-->
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    <!--Servlet的映射 Servlet如果不进行映射则不会被外部所访问-->
    <servlet>
        <servlet-name>SelectServlet</servlet-name>
        <servlet-class>Servlet.SelectServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>SelectServlet</servlet-name>
        <url-pattern>/SelectServlet</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>InsertServlet</servlet-name>
        <servlet-class>Servlet.InsertServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>InsertServlet</servlet-name>
        <url-pattern>/InsertServlet</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>deleteServlet</servlet-name>
        <servlet-class>Servlet.deleteServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>deleteServlet</servlet-name>
        <url-pattern>/deleteServlet</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>PageServlet</servlet-name>
        <servlet-class>Servlet.PageServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>PageServlet</servlet-name>
        <url-pattern>/PageServlet</url-pattern>
    </servlet-mapping>
</web-app>

(2)web – *.jsp 与其相对应的Servlet

(2.1)web – index页面

(2.1.1)web – index.jsp[首页][Jsp页面]

<%@ page import="java.util.List" %>
<%@ page import="Jdbc.Entity.Book" %>
<%@ page import="Jdbc.Tool.Page" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%--
  Created by IntelliJ IDEA.
  User: 30974
  Date: 2023/1/9
  Time: 20:33
  To change this template use File | Settings | File Templates.
--%>
<link rel="shortcut icon" href="#">
<html>
    <head>
        <title>个人图书管理</title>
        <%--<meta name="viewport" content="width=device-width,user-scalable=no,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0"/>--%>
        <%--<link rel="stylesheet" type="text/css" href="css/bootstrap.css"/>--%>
    </head>
    <body>
    <%
        Page page1=Page.getPage();
        List<Book> bookList=(List<Book>) session.getAttribute("bookList");
        if(bookList==null){
            request.getRequestDispatcher("SelectServlet").forward(request,response);
        }
        //else如果删掉 session一直有值 就不会再次进入获取bookList 会造成页面数据不刷新
        else{
            session.setAttribute("bookList",null);
        }
    %>
        <h1>图书信息</h1>
        <table border="1">
            <tr>
                <td>图书名称</td>
                <td>图书作者</td>
                <td>购买时间</td>
                <td>图书分类</td>
                <td>操作</td>
            </tr>
            <%
                for (Book b : bookList) {
                    out.print(
                            "<tr id=trid"+b.getId()+">" +
                                    "<td>"+b.getName()+"</td>" +
                                    "<td>"+b.getAuthor()+"</td>" +
                                    "<td>"+b.getTime()+"</td>" +
                                    "<td>"+b.getType().getName()+"</td>" +
                                    "<td><span class=delete bookid="+b.getId()+">删除</span></td>" +
                            "</tr>"
                    );
                }
            %>
        </table>
        <p>
            <%--设置toPageType 使pageServlet能够识别进行哪种操作--%>
            <a href="PageServlet?toPageType=First">首页</a>
            <a href="PageServlet?toPageType=Prev">上一页</a>
            <span>
                <%=page1.getThisPage()%>/<%=page1.getSumPage()%>
            </span>
            <a href="PageServlet?toPageType=Next">下一页</a>
            <a href="PageServlet?toPageType=Last">尾页</a>
        </p>
        <a href="Insert.jsp">新增图书信息</a>

        <script src="JS/jquery-1.12.4.js"></script>
        <script src="JS/bootstrap.js"></script>
        <script>
            $(function(){
                setOddBack()
            })

            function setOddBack(){
                $("tr:odd").css("background","gray");
                $("tr:even").css("background","none");
            }

            $(".delete").click(
                function () {
                    var bookid=$(this).attr("bookid");
                    //confirm 根据点击的按钮返回true false
                    var deleteIs=confirm("确定要删除编号"+bookid+"的书籍吗？");
                    //如果点击确定 那么进入deleteServlet
                    if(deleteIs==true){
                        location.href="deleteServlet?bookid="+bookid;
                    }
                }
            )

            <%
                //删除操作进行后根据return值进行弹框
                String delIs=request.getParameter("delIs");
                if (delIs!=null){
                    if(delIs.equals("delTrue")){
                    %>
                        alert("删除成功");
                    <%
                    }else{
                    %>
                    alert("删除失败");
                    <%
                    }
                }
            %>
        </script>
    </body>
</html>

(2.1.2)web – SelectServlet (index.jsp)[查询][Servlet]

package Servlet;

import Jdbc.Dao.BookDao;
import Jdbc.Impl.BookDaoImpl;
import Jdbc.Entity.Book;
import javafx.application.Application;

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 javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.List;

@WebServlet(name = "SelectServlet")
public class SelectServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //当前doPost()暂无作用
        System.out.println();
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //当前doGet()用于页面中Session - bookList的初始化
        //创建Jdbc - Impl - BookDaoImpl实例
        BookDao bookDao=new BookDaoImpl();
        //获取book中所有数据
        List<Book> bookList=bookDao.getAllBook();
        //将book表中的数据存入Session - bookList中
        HttpSession session=request.getSession();
        session.setAttribute("bookList",bookList);
        //跳转到jsp页面
        request.getRequestDispatcher("index.jsp").forward(request,response);
        System.out.println();
    }
}

(2.1.3)web – deleteServlet(index.jsp)[删除][Servlet]

package Servlet;

import Jdbc.Dao.BookDao;
import Jdbc.Impl.BookDaoImpl;
import Jdbc.Tool.Page;

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.IOException;
import java.io.PrintWriter;

@WebServlet(name = "deleteServlet")
public class deleteServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String idString=request.getParameter("bookid");
        int id=Integer.parseInt(idString);
        BookDao bookDao=new BookDaoImpl();
        //根据id删除一条数据 返回true成功/false失败
        boolean ReturnIs=bookDao.deleteBook(id);
        //如果成功将index.jsp中的delIs设为delTrue 否则设为delFalse
        if(ReturnIs==true){
            request.getRequestDispatcher("index.jsp?delIs=delTrue").forward(request,response);
        }else{
            request.getRequestDispatcher("index.jsp?delIs=delFalse").forward(request,response);
        }
    }
}

(2.1.4)web – PageServlet(index.jsp)[分页][Servlet]

package Servlet;

import Jdbc.Tool.Page;
import com.mysql.cj.Session;

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 javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet(name = "PageServlet")
public class PageServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String toPageType=request.getParameter("toPageType");
        Page page=Page.getPage();
        //switch判断是什么操作 执行对应的代码
        switch (toPageType){
            case "First":
                page.setThisPage(1);
                break;
            case "Prev":
                page.setThisPage(page.getThisPage()-1);
                break;
            case "Next":
                page.setThisPage(page.getThisPage()+1);
                break;
            case "Last":
                page.setThisPage(page.getSumPage());
                break;
        }

        HttpSession session=request.getSession();
        session.setAttribute("bookList",null);
        //这里不能使用转发 使用转发会出现thisPage多次++的问题
        response.sendRedirect("index.jsp");
    }
}

(2.1)web – insert页面

(2.2)web – insert.jsp[添加][Jsp页面]

<%@ page import="java.util.List" %>
<%@ page import="Jdbc.Entity.Type" %>
<%@ page import="java.util.ArrayList" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page import="com.sun.scenario.effect.impl.sw.sse.SSEBlend_SRC_OUTPeer" %>
<%@ page import="java.util.Date" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="java.text.SimpleDateFormat" %><%--
  Created by IntelliJ IDEA.
  User: 30974
  Date: 2023/1/10
  Time: 11:30
  To change this template use File | Settings | File Templates.
--%>
<html>
<head>
    <title>添加图书</title>
</head>
<body>
<%
    if(session.getAttribute("typeList")==null) {
        request.getRequestDispatcher("InsertServlet").forward(request, response);
    }
    //获取一个本日时间，年-月-日 格式
    SimpleDateFormat simpleDateFormat=new SimpleDateFormat("yyyy-MM-dd");
    String thisDay=simpleDateFormat.format(new Date());
    request.setAttribute("thisDay",thisDay);
%>
    <form method="post" action="InsertServlet">
        <p>
            图书名称
            <input type="text" name="insertName" required>
        </p>
        <p>
            图书作者
            <input type="text" name="insertAuthor" required>
        </p>
        <p>
            //购入时间默认为本日 并且最大为本日
            购入时间
            <input type="date" name="insertTime" value="${thisDay}" max="${thisDay}" min="2000-01-01" required>
         </p>
        <p>
            图书类别
            <select name="insertType" required>
                <c:forEach items="${sessionScope.typeList}" var="t" varStatus="status">
                    <option value="${t.getId()}">${t.getName()}</option>
                </c:forEach>
            </select>
        </p>
        <p>
            <input type="submit" id="insertSub" value="增加图书">
        </p>
    </form>
    <script src="JS/jquery-1.12.4.js"></script>
    <script>
        function goIndex() {
            location.href="index.jsp"
        }
        <%
            String insIs=request.getParameter("insIs");
            if (insIs!=null){
                if(insIs.equals("insTrue")){
                    %>
                    var conIs=confirm("添加成功（确定继续添加，取消返回首页）");
                    if(conIs==false){
                        goIndex();
                    }else{
                        ;
                    }
                    <%
                }else{
                    %>
                    alert("添加失败");
                    <%
                }
            }
        %>
    </script>
</body>
</html>

(2.2.1)web – InsertServlet(Insert.jsp)[添加][Servlet]

package Servlet;

import Jdbc.Dao.BookDao;
import Jdbc.Dao.TypeDao;
import Jdbc.Entity.Type;
import Jdbc.Impl.BookDaoImpl;
import Jdbc.Impl.TypeDaoImpl;
import com.mysql.cj.Session;

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 javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.List;

@WebServlet(name = "InsertServlet")
public class InsertServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //当前doPost()方法用于向BookManage - Book表中添加一条数据
        //设置获取的字符编码格式为utf-8
        request.setCharacterEncoding("utf-8");
        //获取所有需要添加的字段
        String name=request.getParameter("insertName");
        String author=request.getParameter("insertAuthor");
        String time=request.getParameter("insertTime");
        String typeString=request.getParameter("insertType");
        int type=Integer.parseInt(typeString);
        //创建Jdbc - Impl - BookDaoImpl实例
        BookDao bookDao=new BookDaoImpl();
        //进行添加 并返回是否添加成功(t/f)
        boolean insertIs=bookDao.insertBook(name,author,time,type);
        //跳转到jsp页面
        if(insertIs==true){
            request.getRequestDispatcher("Insert.jsp?insIs=insTrue").forward(request,response);
        }else{
            request.getRequestDispatcher("Insert.jsp?insIs=insFalse").forward(request,response);
        }
        System.out.println();
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //当前doGet()用于页面中Session - typeList的初始化
        //创建Jdbc - Impl - TypeDaoImpl实例
        TypeDao typeDao=new TypeDaoImpl();
        //获取Type表中的所有数据
        List<Type> typeList=typeDao.getAllType();
        //将Type表中的数据添加到Session - typeList中,以便jsp页面进行使用
        HttpSession session=request.getSession();
        if(typeList!=null)
            session.setAttribute("typeList",typeList);
        //跳转到jsp页面
        request.getRequestDispatcher("Insert.jsp").forward(request,response);
        System.out.println();
    }
}