前言
每位在学校学java的同学在期末会有java课程设计，而选题很可能就是图书管理系统，此篇文章可以帮助到你。能力有限，代码有bug可以下方的评论区指明
简介
图书馆管理系统分为用户登录和管理员登录，整个系统的控制是在控制台下进行操作的。
用户层
用户可以进行注册，登录，借书，查书，密码修改，还书等功能。
管理员层
管理员可以进行对管理书籍包括新书上架，修改库存信息等功能。
系统本身
系统本身可以根据用户是否逾期进行锁定禁止借书的功能等。
需要掌握的java知识
java基础语法，容器（list），jdbc，sql语句。
po层代码
public class LibararyDao {
public boolean addBook(Bookinfo bookinfo){
try {
Connection con =JDBCutil.creatConnection();
String sql = "insert into bookinfo (bookname,zuozhe,shuliang,shengyushuliang,date)"
+ " values (?,?,?,?,?) ";
PreparedStatement pre =con.prepareStatement(sql);
pre.setString(1, bookinfo.getBookname());
pre.setString(2, bookinfo.getZuozhe());
pre.setInt(3, bookinfo.getShuliang());
pre.setInt(4, bookinfo.getShuliang());
pre.setDate(5, new java.sql.Date(bookinfo.getData().getTime()));
pre.execute();
} catch (SQLException e) {
System.out.println("图书注册失败");
e.printStackTrace();
return false;
}
return true;
}
public boolean addUser(User user){
try {
Connection con =JDBCutil.creatConnection();
String sql = "insert into userinfo (username,password,books) values (?,?,0) ";
PreparedStatement pre =con.prepareStatement(sql);
pre.setString(1, user.getUsername());
pre.setString(2, user.getPassword());
pre.execute();
} catch (SQLException e) {
System.out.println("注册失败");
e.printStackTrace();
return false;
}
return true;
}
public ResultSet queryUser(User user){
try {
Connection con =JDBCutil.creatConnection();
String sql = "select * from userinfo where username = ? ";
PreparedStatement pre;
pre = con.prepareStatement(sql);
pre.setString(1, user.getUsername());
ResultSet r =pre.executeQuery();
return r;
} catch (SQLException e) {
System.out.println("查询失败");
e.printStackTrace();
return null;
}
}
public boolean updateUserbooks(User user){
try {
Connection con =JDBCutil.creatConnection();
String sql = "update userinfo set books = ? where username = ? ";
PreparedStatement pre;
pre = con.prepareStatement(sql);
pre.setInt(1, user.getBooks());
pre.setString(2, user.getUsername());
int r =pre.executeUpdate();
if(r>0){
return true;
}else{
return false;
}
} catch (SQLException e) {
System.out.println("查询失败");
e.printStackTrace();
return false;
}
}
public boolean addborrowinfo(String username,String bookname){
try {
Connection con =JDBCutil.creatConnection();
String sql = "insert into borrowinfo (username,bookname,borrowdate,returndate)"
+ " values (?,?,?,?) ";
PreparedStatement pre;
pre = con.prepareStatement(sql);
pre.setString(1, username);
pre.setString(2, bookname);
pre.setDate(3, new java.sql.Date(new Date().getTime()));
pre.setDate(4, new java.sql.Date(DateUtil.addMonth(new Date()).getTime()));
pre.execute();
} catch (SQLException e) {
System.out.println("借书失败");
e.printStackTrace();
return false;
}
return true;
}
public ResultSet queryBook(String bookname){
try {
Connection con =JDBCutil.creatConnection();
String sql = "select * from bookinfo where bookname ='"+bookname+"'";
PreparedStatement pre;
pre = con.prepareStatement(sql);
ResultSet r =pre.executeQuery();
return r;
}
catch (SQLException e) {
System.out.println("借书失败");
e.printStackTrace();
return null;
}}
public ResultSet queryAllBook(){
try {
Connection con =JDBCutil.creatConnection();
String sql = "select * from bookinfo ";
PreparedStatement pre;
pre = con.prepareStatement(sql);
ResultSet r =pre.executeQuery();
return r;
}
catch (SQLException e) {
System.out.println("借书失败");
e.printStackTrace();
return null;
}
}
public ResultSet querySubBookInfo(int page){
try {
Connection con =JDBCutil.creatConnection();
PreparedStatement pre;
String sql = "select * from bookinfo limit ?,5 ";
pre = con.prepareStatement(sql);
pre.setInt(1, page);
ResultSet r =pre.executeQuery();
return r;
}
catch (SQLException e) {
System.out.println("借书失败");
e.printStackTrace();
return null;
}
}
public int queryPageInfo(){
try {
int zongshu = 0;
Connection con =JDBCutil.creatConnection();
String sql1 = "select count(id) as cou from bookinfo ";
Statement sta =con.createStatement();
ResultSet res =sta.executeQuery(sql1);
if(res.next())
{
zongshu = res.getInt("cou");
if(zongshu == 0)return 0;
}
int a =0;
if(zongshu%5==0){
a = zongshu/5;
}else{
a = zongshu/5+1;
}
return a;
}
catch (SQLException e) {
System.out.println("借书失败");
e.printStackTrace();
return -1;
}
}
public boolean updateBookinfo(String bookname,int sysl){
try {
Connection con =JDBCutil.creatConnection();
String sql = "update bookinfo set shengyushuliang = ? where bookname = ?";
PreparedStatement pre;
pre = con.prepareStatement(sql);
pre.setInt(1,sysl);
pre.setString(2, bookname);
int r =pre.executeUpdate();
if(r>0){
return true;
}else{
return false;
}
} catch (SQLException e) {
System.out.println("借书失败");
e.printStackTrace();
return false;
}
}
public ResultSet queryBorrowinfo(String username){
try {
Connection con =JDBCutil.creatConnection();
String sql = "select * from borrowinfo where username = '"+username+"'";
PreparedStatement pre = con.prepareStatement(sql);
ResultSet r =pre.executeQuery();
return r;
} catch (SQLException e) {
System.out.println("查询失败");
e.printStackTrace();
return null;
}
}
public ResultSet queryBorrowinfo(String username,String bookname){
try {
Connection con =JDBCutil.creatConnection();
String sql = "select * from borrowinfo where username = ? and bookname = ?";
PreparedStatement pre = con.prepareStatement(sql);
pre.setString(1, username);
pre.setString(2, bookname);
ResultSet r =pre.executeQuery();
return r;
} catch (SQLException e) {
System.out.println("查询失败");
e.printStackTrace();
return null;
}
}
public boolean deleteBorrowInfo(String username,String bookname){
try {
Connection con =JDBCutil.creatConnection();
String sql = "delete from borrowinfo where username = ? and bookname = ? ";
PreparedStatement pre = con.prepareStatement(sql);
pre.setString(1, username);
pre.setString(2, bookname);
pre.execute();
return true;
} catch (SQLException e) {
System.out.println("查询失败");
e.printStackTrace();
return false;
}
}
}
control层代码
package library.controller;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import library.dao.LibararyDao;
import library.po.Bookinfo;
import library.po.BorrowInfo;
import library.po.User;
public class BookController {
private static LibararyDao bookdao;
private BorrowInfo b;
public BookController() {
if(bookdao == null) bookdao = new LibararyDao();
}
public static void main(String[] args) {
//System.out.println(new BookController().addUser(new User("123", "dvdf")));
//System.out.println(new BookController().borrowBook("123", new User("123", "dvdf")));
// new BookController().fenyeInfo(2);
}
public int loginUser(User user){
ResultSet rs =bookdao.queryUser(user);//验证用户是否存在
try {
if(rs!=null&&rs.next()){
boolean b =rs.getString("password").equals(user.getPassword());
if(b){
return 1;
}
}
return 2;
} catch (SQLException e) {
e.printStackTrace();
return 3;
}
}
public int loginGuanli(User user){
ResultSet rs =bookdao.queryUser(user);//验证管理员是否存在
try {
if(rs!=null&&rs.next()){
boolean b =rs.getString("password").equals(user.getPassword());
int b1 = rs.getInt("isguanli");//管理员标志位1
if(b&&b1==1){
return 1;
}
}return 2;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return 3;
}
}
public int queryBookinfo(){
try {
ResultSet r =bookdao.queryAllBook();
while(r!=null&&r.next()){
System.out.println("书名"+r.getString("bookname")+"作者"+
r.getString("zuozhe")+"总数"+r.getInt("shuliang")+"剩余数量"+r.getInt("shengyushuliang"));
}
if(r==null)return 2;
return 1;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return 2;
}
}
public ResultSet queryBookK(String bookname){
ResultSet r =bookdao.queryBook(bookname);
return r;
}
public int queryBook(String bookname){
try {
ResultSet r =bookdao.queryBook(bookname);
while(r!=null&&r.next()){
System.out.println("书名"+r.getString("bookname")+"作者"+
r.getString("zuozhe")+"总数"+r.getInt("shuliang")+"剩余数量"+r.getInt("shengyushuliang"));
}
if(r==null)return 2;
return 1;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return 2;
}
}
public int addBookinfo(Bookinfo bookinfo){
boolean b = bookdao.addBook(bookinfo);
if(b)return 1;
return 2;
}
public int addUser(User user){
ResultSet rs =bookdao.queryUser(user);
try {
if(rs!=null&&!rs.next()){
boolean b =bookdao.addUser(user);
if(b)return 1;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return 3;
}
return 2;
}
public int queryUser(User user){
ResultSet r = bookdao.queryUser(user);
try {
if(r.next()){
user.setBooks(r.getInt("books"));
System.out.println(user);
return 1;
}
return 2;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return 2;
}
}
public String borrowBook(String bookname,User user){
try {
if(!bookdao.queryBook(bookname).next()){
return "借书失败-书籍不存在";}
ResultSet querybookrs = bookdao.queryBook(bookname);
while(querybookrs.next()){
int t = querybookrs.getInt("shengyushuliang");
if(t<1){return "库存不足";}
ResultSet rs =bookdao.queryBorrowinfo(user.getUsername());
if(rs!=null&&!rs.next()){
//加入借阅详细信息
boolean b1 =bookdao.addborrowinfo(user.getUsername(), bookname);
//更新借书数量
ResultSet rs1 = bookdao.queryUser(user);
rs1.next();
user.setBooks(rs1.getInt("books")+1);
bookdao.updateUserbooks(user);
//更新库存
boolean b2 =bookdao.updateBookinfo(bookname, t-1);
//System.out.println(b1+" "+b2);
return b1?(b2?"借书成功":"借书失败"):("借书失败");
}
}
return null;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return "借书失败-其他错误";
}
}
public int returnBook(User user,String bookname){
boolean b1 = bookdao.deleteBorrowInfo(user.getUsername(),bookname);
boolean b2 = false;
boolean b3 = false;
try {
//更新库存
ResultSet r = bookdao.queryBook(bookname);
if(r.next()){
int i = r.getInt("shengyushuliang");
b2 = bookdao.updateBookinfo(bookname,i+1);
}
//更新持有书数
r = bookdao.queryUser(user);
if(r.next()){
int i = r.getInt("books");
user.setBooks(i-1);
b3 =bookdao.updateUserbooks(user);
}
if(!b1||!b2||!b3){
return 2;
}
return 1;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return 2;
}
}
public List queryborrowinfo(User user){
ResultSet r = bookdao.queryBorrowinfo(user.getUsername());
List l = new ArrayList();
try {
while(r!=null&&r.next()){
b = new BorrowInfo();
b.setUsername(r.getString("username"));
b.setBookname(r.getString("bookname"));
b.setBorrowdate(r.getDate("borrowdate"));
b.setReturndate(r.getDate("returndate"));
l.add(b);
}
return l;
} catch (SQLException e) {
e.printStackTrace();
return null;
}
}
public void fenyeInfo(int age){
int i =bookdao.queryPageInfo();
System.out.println("总页数："+i);
try {
if(i>0){
ResultSet r = bookdao.querySubBookInfo((age-1)*5);
while(r!=null&&r.next()){
System.out.println("书名"+r.getString("bookname")+"作者"+
r.getString("zuozhe")+"总数"+r.getInt("shuliang")+"剩余数量"+r.getInt("shengyushuliang"));
}
}
} catch (SQLException e) {
e.printStackTrace();
}
}
public void fenyeInfo(String age){
}
public void updateBookinfo(String bookname){
Scanner scan = new Scanner(System.in);
System.out.println("更新作者输入:1，跳过11");
int i =scan.nextInt();
List> list = new ArrayList>();
List list1 = null;
if(i==1){
String newbookname = scan.next();
list1 = new ArrayList();
list1.add("zuozhe");
list1.add("'"+newbookname+"'");
list.add(list1);
}
//如果更新了库存，剩余数量也会跟着更新 需要判断库存逻辑的正确性
System.out.println("更新数量输入2，跳过22");
int ii = scan.nextInt();
if(ii==2){
System.out.println("请更新库存数量");
int newsum = scan.nextInt();
//判断数量逻辑的正确性
ResultSet r = queryBookK(bookname);
int oldsum=0;int sykc=0;//旧库存和剩余数量
try {
while(r.next()){
oldsum = r.getInt("shuliang");
sykc = r.getInt("shengyushuliang");
}
if(newsum>oldsum){
sykc+=newsum-oldsum;//记录更新后的剩余数量
//System.out.println("根据已有库存，库存总量为---"+newsum);
}
else if(newsum=sykc){//如何新的库存少于就库存。判断新库存与剩余数量的关系
sykc-=newsum;
}else{
System.out.println("输入错误");
return ;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
list1 = new ArrayList();
list1.add("shuliang");
list1.add(String.valueOf(newsum));
list.add(list1);
list1 = new ArrayList();
list1.add("shengyushuliang");
list1.add(String.valueOf(sykc));
list.add(list1);
}
bookdao.updateBookinfo(list, bookname);
}
}
view层
package library.view;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Date;
import java.util.InputMismatchException;
import java.util.List;
import java.util.Scanner;
import library.controller.BookController;
import library.po.Bookinfo;
import library.po.BorrowInfo;
import library.po.User;
public class View {
//controller 业务控制类
private static BookController bookc = new BookController();
//登陆后的用户跟踪类似session
private static User user;
//控制主界面的循环
private static boolean flag = true;
//接受控制台输入
private static Scanner scan = new Scanner(System.in);
public static void main(String[] args) {
bookRun();
}
//主界面 应该考虑其他输入的限定 （当输入字符时，系统停止运行）
public static void bookRun(){
try{
do{
System.out.println("欢迎来到图书借阅系统n登陆输入: 1n注册输入: 2n管理员管理:3");
int i1 = scan.nextInt();
switch (i1) {
case 1://登陆逻辑
System.out.println("输入账号");
String username = scan.next();
System.out.println("密码");
String password = scan.next();
int i =bookc.loginUser(new User(username, password));
if(i==1){
System.out.println("登陆成功");
user = new User(username, password);
loginSuccess(user);
}else if(i!=1){
System.out.println("登陆失败，检查密码或者账号");
}
break;
case 2:
//注册逻辑 可以添加验证密码 进行密码的确定 java api有把明文进行处理的方法，请自行搜索
//还可以加入正则表达式进行账号的限定（对于特殊字符输入的处理等）
System.out.println("输入申请账号");
String username1 = scan.next();
System.out.println("密码");
String password1 = scan.next();
//此处可以再次确认密码的逻辑
System.out.println(addUser(new User(username1, password1)));
System.out.println("返回上一层");
break;
case 3://管理员逻辑
System.out.println("输入管理员账号");
String username2 = scan.next();
System.out.println("密码");
String password2 = scan.next();
user = new User(username2, password2);
int i2 =bookc.loginGuanli(user);
if(i2==1){
loginGuanliSuccess();
}else{
System.out.println("登陆失败，检查密码或者账号");
}
break;
default :
System.out.println("输入序号不正确");
break;
}
}while(flag);
}catch(InputMismatchException e){
System.out.println("输入异常，请重启系统");
}
}
//此处可以添加新的功能而不影响已有功能 （可以改为switch语句）
private static void loginGuanliSuccess() {
while(true){
System.out.println("添加图书：1n更改图书信息：2n返回：3");
int i = scan.nextInt();
if(i==1){
addBook();
}else if(i==2){
updateBookinfo();
}else if(i==3){
return;
}
}
}
//更新图书
private static void updateBookinfo() {
//应该判断书名是否存在 contro层设计
System.out.println("请输入书名");
String bookname = scan.next();
int a = bookc.queryBook(bookname);
if(a!=1){
System.out.println("不存在，已返回上一层");
return;
}
bookc.updateBookinfo(bookname);
}
//添加图书 需要保证名字唯一性
private static void addBook() {
System.out.println("图名");
String bookname = scan.next();
System.out.println("作者");
String zuozhe = scan.next();
System.out.println("数量");
int shuliang = scan.nextInt();
Bookinfo bookinfo = new Bookinfo(bookname, zuozhe, shuliang, shuliang,new Date());
int i =bookc.addBookinfo(bookinfo);
if(i==1){
System.out.println("添加成功");
}else{
System.out.println("错误");
}
}
//注册界面的实现
private static String addUser(User user){
switch (bookc.addUser(user)) {
case 1:
return "注册成功";
case 2:
return "用户已注册";
case 3:
return "其他错误，重试";
}
return "其他错误，重试";
}
//登陆功能实现
private static void loginSuccess(User user ){
while (true){
System.out.println("查看借阅信息请输入：1，借书：2，还书：3，账号信息：4,退出：5"
+ "查询图书：6修改密码：7n");
int i = scan.nextInt();
switch (i) {
case 1:
borrowInfo(user);
break;
case 2:
borrowBook(user);
break;
case 3:
returnBook(user);
break;
case 4:
queryUser(user);
break;
case 5:
return ;
case 6:
System.out.println("请输入书名");
queryBook(scan.next());
break;
case 7: break;
default:
System.out.println("输入错误");
break;
}
}
}
//查询借阅信息
private static void borrowInfo(User user ){
List l=bookc.queryborrowinfo(user);
if(l==null||l.isEmpty()){
System.out.println("没有借阅信息");
return;
}
for (BorrowInfo borrowInfo : l) {
System.out.println(borrowInfo);
}
}
//借书
private static void borrowBook(User user){
System.out.println("请输入借阅的书籍名称");
String bookname =scan.next();
String flog = bookc.borrowBook(bookname, user);
System.out.println(flog);
System.out.println("是否继续借书：y|n");
String flog1 = scan.next();
if(flog1.equalsIgnoreCase("y")){
borrowBook(user);
}
}
//还书
private static void returnBook(User user1 ){
List l=bookc.queryborrowinfo(user1);
if(l==null||l.isEmpty()){
System.out.println("没有借阅信息");
return;
}
for (BorrowInfo borrowInfo : l) {
System.out.println(borrowInfo);
}
System.out.println("请输入要还书籍的名字");
String bookname = scan.next();
int flog =bookc.returnBook(user1, bookname);
if(flog==1){
System.out.println("还书成功");
}else{
System.out.println("失败");
}
System.out.println("是否继续还书：y|n");
String flog1 = scan.next();
if(flog1.equalsIgnoreCase("y")){
returnBook(user1);
}
}
//用户信息
private static void queryUser(User user){
int i =bookc.queryUser(user);
if( i!=1){
System.out.println("失败");
}
}
private static void queryBook(String bookname){
int i = bookc.queryBook(bookname);
if(i!=1)System.out.println("书籍不存在");
}
private static void GuanliFace(){
while(true){
System.out.println("查询书籍列表请输入 ：1；添加图书：2；使用分页查看书籍列表");
int i =scan.nextInt();
switch (i) {
case 1:
int i1= bookc.queryBookinfo();
if(i1==2)System.out.println("错误");
break;
case 2:
System.out.println("书名");
String booknname1 = scan.next();
System.out.println("作者");
String zuozhe1 = scan.next();
System.out.println("数量");
int shuliang1 = scan.nextInt();
Date date = new Date();
int i3 = bookc.addBookinfo(new Bookinfo(booknname1, zuozhe1, shuliang1, shuliang1, date));
if(i3==2)System.out.println("错误");
break;
case 3:
default:
System.out.println("错");
break;
}
}
}
private static void fenyeInfo(){
}
}
数据库
/用户表 CREATE TABLE `userinfo` ( `id` int(10) NOT NULL AUTO_INCREMENT, `username` varchar(20) COLLATE utf8_bin DEFAULT NULL, `password` varchar(20) COLLATE utf8_bin DEFAULT NULL, `books` int(10) DEFAULT NULL, `isguanli` int(10) NOT NULL DEFAULT '0', PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=21 DEFAULT CHARSET=utf8 COLLATE=utf8_bin; /借书信息 CREATE TABLE `borrowinfo` ( `id` int(10) NOT NULL AUTO_INCREMENT, `username` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL, `bookname` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL, `borrowdate` date DEFAULT NULL, `returndate` date DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci; /书籍信息 字段用的拼音:-D CREATE TABLE `bookinfo` ( `id` int(10) NOT NULL AUTO_INCREMENT, `bookname` varchar(20) COLLATE utf8_unicode_ci NOT NULL, `zuozhe` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL, `shuliang` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL, `shengyushuliang` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL, `date` date DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
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