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01 Overview
A powerful library management system with complete functions. It is the best choice for students to learn.
02 Technology
This system is implemented using java awt . java.awt is a software package that contains all categories for creating user interfaces and drawing graphics and images. In AWT terminology, user interface objects such as buttons or scroll bars are called components. The Component class is the root of all AWT components.
03 Detailed function
Basic maintenance
Book maintenance
- Add: Enter the book number, book name, book page number, book author, publisher, inventory quantity, type and other book information, and click the Save button to add a new book.
- Modification: First query the book to be modified based on the book number, and then modify the book's name, book pages, author, publication time, pricing, inventory and other information.
- Deletion: First, find the book to be deleted according to the book number, and then delete it.
Reader maintenance
- Add: Enter reader number, reader name, reader category, reader gender, number of days available for borrowing and other information, and then click the "Add" button to add a new reader.
- Modification: First query the reader information to be modified based on the reader number, and then modify the reader number, reader name, reader category, reader gender, number of days available for borrowing and other information. After the modification is completed, click the "Save" button to complete the modification.
- Delete: First query the reader information to be deleted according to the reader number, and then perform the delete operation.
Borrowing management
- Borrowing book management: First, query the book and reader information according to the book number and reader number, and click the "Lend" button to complete the borrowing.
- Book return management: First, query the book and reader information according to the book number and reader number, and then click the "Return Book" button to complete the book return.
Query management
- Book query: enter any of the book name, author, and publication time, and click the "query" button to query the book.
- Reader query: enter any of the reader's name and reader type, and click the "query" button to query the reader.
System Management
- Modify password: First enter the old password and wait for verification. After the old password is entered correctly, you can set a new password.
- Exit the system: Exit the library management system program.
04 Run screenshot
Add book
Add readers
Book management
Book query
change Password
05 main code
Add book
package com.jason.frame;//com.jason.frame.BookAdd.java
import java.awt.*;
import java.awt.event.*;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import javax.swing.JOptionPane;
public class BookAdd extends Frame implements ActionListener{
Toolkit tool= getToolkit();
String url="src/bookbk.png";
Image img=tool.getImage(url);
public void paint(Graphics g){
g.drawImage(img,0,0,this);
}
public void clearAndSetBookId(){
for(int j=0;j<booktxt.length;j++){
booktxt[j].setText("");
}
String str=getInsertOrderedList();
booktxt[0].setEditable(false);
booktxt[0].setText(str);
}
String[] lbname={"图书编号","图书名称","图书页数","图书作者","翻 译","出 版 社","出版时间","定价","库存数量","所属类型"};
Label[] booklb=new Label[10];
TextField[] booktxt=new TextField[10];
Button savebtn=new Button("Save");
Button closebtn=new Button("Close");
Choice booktype=new Choice();
public BookAdd(){
setTitle("添加新书");
setLayout(null);
setSize(500,250);
setResizable(false);
//this.setOpaque(false);
this.setForeground(Color.BLACK);
int lx=50,ly=50;
booktype.add("程序设计");
booktype.add("图形设计");
booktype.add("其他");
booktype.add("科技");
booktype.add("文学");
booktype.add("历史");
booktype.add("百科");
booktype.add("英语");
booktype.add("计算机");
booktype.add("Internet");
booktype.add("数学");
String str=getInsertOrderedList();
for(int i=0;i<booklb.length;i++){
if(lx>240){
lx=50;
ly=ly+30;
}
booklb[i]=new Label(lbname[i]);
booklb[i].setBounds(lx,ly,50,20);
booktxt[i]=new TextField();
booktxt[i].setBounds(lx+60,ly,100,20);
lx=lx+190;
add(booklb[i]);add(booktxt[i]);
}
booktxt[0].setEditable(false);
booktxt[0].setText(str);
booktxt[9].setVisible(false);
booktype.setBounds(300,170,100,20);
add(booktype);
savebtn.setBounds(150,210,80,25);
closebtn.setBounds(280,210,80,25);
add(savebtn);add(closebtn);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
DbOp.close();
dispose();
}
});
savebtn.addActionListener(this);
closebtn.addActionListener(this);
setLocationRelativeTo(null);
setVisible(true);
}
public static String getInsertOrderedList(){
String returnstring="";
String sql="select * from book";
try{
int count=0;
ResultSet rs=DbOp.executeQuery(sql);
while(rs.next()){
count++;
}
String[] allid=new String[count];
int[] intofid=new int[count];
int i=0;
ResultSet rs1=DbOp.executeQuery(sql);
while(rs1.next()){
allid[i]=rs1.getString("id");
String mystr=allid[i].substring(1);
intofid[i]=Integer.parseInt(mystr);
i++;
}
int temp=-1;
for(int j=0;j<intofid.length;j++){
if(intofid[j]>temp){
temp=intofid[j];
}
}
returnstring=String.valueOf(temp+1);
int len=returnstring.length();
for(int f=0;f<5-len;f++){
returnstring="0"+returnstring;
}
returnstring="A"+returnstring;
DbOp.close();
}catch(SQLException ee){
}
return returnstring;
}
public void actionPerformed(ActionEvent e){
Object ob=e.getSource();
if(ob==savebtn){
savebtnActionPerformed();
clearAndSetBookId();
}
if(ob==closebtn){
DbOp.close();
dispose();
}
}
public void savebtnActionPerformed(){
String id=booktxt[0].getText();
String typestr=booktype.getSelectedItem().toString();
String[] inputstring=new String[9];
boolean emptyequals=false;
for(int i=0;i<inputstring.length;i++){
inputstring[i]=booktxt[i].getText();
if(inputstring[i].equals("")){
JOptionPane.showMessageDialog(null,"请务必填写完整");
return;
}
}
if(id.equals("")){
JOptionPane.showMessageDialog(null,"图书编号不能为空");
return;
}
if(IfBookIdExit(id)){
JOptionPane.showMessageDialog(null,"图书编号已存在");
return;
}
try{
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM");
sdf.parse(inputstring[6]);
float price=Float.parseFloat(inputstring[7]);
int stock= Integer.parseInt(inputstring[8]);
int page=Integer.parseInt(inputstring[2]);
String sql="insert into book(id,bookname,booktype,author,translator,publisher,publish_time,price,stock,page)";
sql=sql+"values('"+id+"','"+inputstring[1]+"','"+typestr+"','"+inputstring[3]+"','"+inputstring[4]+"','";
sql=sql+inputstring[5]+"','"+inputstring[6]+"',"+price+","+stock+","+page+")";
int i=DbOp.executeUpdate(sql);
if(i==1){
JOptionPane.showMessageDialog(null,"图书添加成功！");
clearAllText();
}
}catch(ParseException e2){
JOptionPane.showMessageDialog(null,"出版时间格式错误，正确为（年-月）");
}catch(NumberFormatException e1){
JOptionPane.showMessageDialog(null,"库存数量，价格，页数错误，应为数字");
}
}
public boolean IfBookIdExit(String id){
boolean right=false;
String sql="select*from book where id='"+id+"'";
ResultSet rs=DbOp.executeQuery(sql);
try{
while(rs.next()){
right = true;
}
//right = false;
}catch(SQLException e){
JOptionPane.showMessageDialog(null,"无法正常读取数据");
}
return right;
}
public void clearAllText(){
for(int i=0;i<booktxt.length;i++){
booktxt[i].setText("");
}
}
public static void main(String[] args){
new BookAdd();
}
}Add readers
package com.jason.frame;//com.jason.frame.ReaderAdd.java
import java.awt.*;
import java.awt.event.*;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.swing.JOptionPane;
public class ReaderAdd extends Frame{
Toolkit tool= getToolkit();
String url="src/bookbk.png";
Image img=tool.getImage(url);
public void paint(Graphics g){
g.drawImage(img,0,0,this);
}
public void clearAndSetReaderId(){
for(int j=0;j<readertxt.length;j++){
readertxt[j].setText("");
}
String str=getInsertOrderedList();
readertxt[0].setEditable(false);
readertxt[0].setText(str);
}
String[] labelsign={"读者编号","读者姓名","读者类别","读者性别","可借数量","可借天数"};
Label[] readerlb=new Label[6];
static TextField[] readertxt=new TextField[6];
Button querybtn,closebtn;
static Choice readertype,readersex;
public ReaderAdd(){
setLayout(null);
setSize(500,200);setResizable(false);
setTitle("添加新读者");
String str=getInsertOrderedList();
int lx=50,ly=50;
for(int i=0;i<readertxt.length;i++){
if(lx>240){
ly=ly+30;
lx=50;
}
readerlb[i]=new Label(labelsign[i]);
readertxt[i]=new TextField();
readerlb[i].setBounds(lx,ly,50,20);
readertxt[i].setBounds(lx+60,ly,100,20);
lx=lx+190;
add(readerlb[i]);
add(readertxt[i]);
}
readertxt[0].setEditable(false);
readertxt[0].setText(str);
readertype=new Choice();
readertype.add("教师");
readertype.add("学生");
readertype.add("作家");
readertype.add("职工");
readertype.add("其他");
readersex=new Choice();
readersex.add("男");
readersex.add("女");
readertxt[2].setVisible(false);
readertxt[3].setVisible(false);
readertype.setBounds(110,80,100,20);
readersex.setBounds(300,80,100,20);
add(readertype);add(readersex);
querybtn=new Button("Add");
closebtn=new Button("Close");
querybtn.setBounds(130,140,50,20);
closebtn.setBounds(310,140,50,20);
add(querybtn);add(closebtn);
querybtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
updateActionPerformed(e);
clearAndSetReaderId();
}
});
closebtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
DbOp.close();
dispose();
//System.exit(0);
}
});
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
DbOp.close();
dispose();
//System.exit(0);
}
});
setLocationRelativeTo(null);
setVisible(true);
}
public static String getInsertOrderedList(){
String returnstring="";
String sql="select * from reader";
try{
int count=0;
ResultSet rs=DbOp.executeQuery(sql);
while(rs.next()){
count++;
}
String[] allid=new String[count];
int[] intofid=new int[count];
int i=0;
ResultSet rs1=DbOp.executeQuery(sql);
while(rs1.next()){
allid[i]=rs1.getString("id");
intofid[i]=Integer.parseInt(allid[i]);
i++;
}
int temp=-1;
for(int j=0;j<intofid.length;j++){
if(intofid[j]>temp){
temp=intofid[j];
}
}
returnstring=String.valueOf(temp+1);
int len=returnstring.length();
for(int f=0;f<5-len;f++){
returnstring="0"+returnstring;
}
DbOp.close();
}catch(SQLException ee){
}
return returnstring;
}
public static void updateActionPerformed(ActionEvent e){
String[] readerstr=new String[6];
readerstr[2]=readertype.getSelectedItem().toString();
readerstr[3]=readersex.getSelectedItem().toString();
for(int i=0;i<readerstr.length;i++){
if(i==2||i==3){
continue;
}
readerstr[i]=readertxt[i].getText();
if(readerstr[i].equals("")){
JOptionPane.showMessageDialog(null,"请务必填写完整");
return;
}
}
String id=readerstr[0];
if(IfReaderExit(id)){
JOptionPane.showMessageDialog(null,"该读者已经存在！");
return;
}
try{
int max_num=Integer.parseInt(readerstr[4]);
int days_num=Integer.parseInt(readerstr[5]);
String sql="insert into reader(id,readername,readertype,sex,max_num,days_num) values('";
sql=sql+id+"','"+readerstr[1]+"','"+readerstr[2]+"','"+readerstr[3]+"',"+max_num+","+days_num+")";
int a=DbOp.executeUpdate(sql);
if(a==1){
JOptionPane.showMessageDialog(null,"读者添加成功");
}else{
JOptionPane.showMessageDialog(null,"读者添加失败");
}
DbOp.close();
}catch(NumberFormatException e1){
JOptionPane.showMessageDialog(null,"可借数量和可借天数必须是整数");
}
}
public static boolean IfReaderExit(String id){
String sql="select * from reader where id='"+id+"'";
try{
ResultSet rs=DbOp.executeQuery(sql);
if(rs.next()){
return true;
}else{
return false;
}
}catch(SQLException e){
JOptionPane.showMessageDialog(null,"查询数据错误");
}
return false;
}
public static void main(String[] args){
new ReaderAdd();
}
}change Password
package com.jason.frame;//com.jason.frame.ChangePassWord.java;
import java.awt.*;
import java.awt.event.*;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.swing.JOptionPane;
public class ChangePassWord extends Frame{
String[] sign={"旧密码：","设定新密码：","重复新密码："};
Label[] textlb=new Label[3];
TextField[] passtxt=new TextField[3];
Button reset=new Button("新密码设定");
public ChangePassWord(){
setTitle("修改密码");
setSize(300,250);
setLayout(null);
setResizable(false);
int y=50;
for(int i=0;i<3;i++){
textlb[i]=new Label(sign[i]);
passtxt[i]=new TextField();
textlb[i].setBounds(50,y,80,20);
passtxt[i].setBounds(130,y,100,20);
passtxt[i].setEchoChar('●');
add(textlb[i]);add(passtxt[i]);
y=y+50;
}
reset.setBounds(110,200,80,20);
add(reset);
setLocationRelativeTo(null);
reset.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
setNewPassWord(e);
}
});
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
setVisible(true);
}
public void setNewPassWord(ActionEvent e){
String[] password=new String[3];
String sql;
for (int i=0;i<password.length;i++){
password[i]=passtxt[i].getText();
}
if(!password[0].equals("")){
sql="select * from user where username='"+GlobalVar.login_user+"'";
}else{
JOptionPane.showMessageDialog(null,"Empty String Just Input");
return;
}
if(password[0].equals(password[1])){
}
try{
ResultSet rs=DbOp.executeQuery(sql);
while(rs.next()){
if(password[0].equals(rs.getString("password"))){
}else{
JOptionPane.showMessageDialog(null,"Sorroy It's Fail It's not Old PassWord");
return;
}
}
}catch(SQLException ee){
JOptionPane.showMessageDialog(null,"Sorroy It's Fail Some Data Wrong");
return;
}
if(password[0].equals(password[1])){
JOptionPane.showMessageDialog(null,"Sorroy It's Fail Same From Old Password");
return;
}
if(!password[1].equals(password[2])){
JOptionPane.showMessageDialog(null,"Sorroy It's Fail Again Password wrong");
return;
}
if(password[1].equals("")&&password[1].equals("")){
JOptionPane.showMessageDialog(null,"Sorroy It's Fail one Empty");
return;
}
sql="";
sql="update user set password='"+password[1]+"'where username='"+GlobalVar.login_user+"'";
int da=DbOp.executeUpdate(sql);
if(da==1){
JOptionPane.showMessageDialog(null,"yet It's Successed Update PassWord");
}else{
JOptionPane.showMessageDialog(null,"Sorroy It's Fail try again");
}
}
public static void main(String[] args){
new ChangePassWord();
}
}06 Download the source code
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