最近用Java和Mysql数据库写了一个停车管理程序，效果如图。
Java主要用到窗体，最外层需要一个JFrame框架，内层可以嵌套多种组件，如JLable、JButton等，所有内部组件的位置可以由setBounds函数来设定。
与Mysql的连接使用JDBC，主要代码如下，大部分已注释:
package trying;
import java.awt.*;
import java.sql.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Vector;
import java.io.*;
import javax.imageio.*;
public class trying {
static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost:3306/cars?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC";
static final String USER = "root";
static final String PASS = "";
//数据库配置
static int loginflag=0;
//登录标记
static String find;
//查询值
public static void main(String[] args){
JFrame car=new JFrame("汽车管理系统 黄文略");
car.setSize(1073, 821);
car.setLocation(400, 150);
car.setLayout(null);
car.setResizable(false);
//构建框架并设定
JPanel inputp=new JPanel();
inputp.setBounds(0, 700, 900, 30);
inputp.setLayout(new GridLayout(1,2,10,10));
car.add(inputp);
//用户名密码版块
JPanel login=new JPanel();
login.setBounds(490, 730, 90, 30);
login.setLayout(new GridLayout(1,1,10,10));
JButton log=new JButton("登录");
login.add(log);
car.add(login);
//登录按钮版块
BufferedImage img=null;
try {
img=ImageIO.read(new File("D:/IE下载/1.jpg"));
} catch (IOException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}//读取首页图片
JLabel pic=new JLabel(new ImageIcon(img));
car.add(pic);
pic.setBounds(0, 0, img.getWidth(), img.getHeight());
//首页图片版块
JLabel user=new JLabel("用户名：",JLabel.RIGHT);
JTextField username=new JTextField();
inputp.add(user);
inputp.add(username);
//用户名标签及其文本域
JLabel key=new JLabel("密码：",JLabel.RIGHT);
JTextField keyText=new JTextField();
inputp.add(key);
inputp.add(keyText);
//密码标签及其文本域
car.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
car.setVisible(true);
//显示框架
log.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
String a=username.getText();
String b=keyText.getText();
loginos(a,b);
if(loginflag==1) {
car.dispose();
//关闭上一个窗口
JFrame caros=new JFrame("汽车管理系统 黄文略");
caros.setSize(1073, 821);
caros.setLocation(400, 150);
caros.setLayout(null);
caros.setResizable(false);
//构建新操作框架
JMenuBar bar=new JMenuBar();
bar.setBounds(0, 0, 40, 20);
JMenu mset=new JMenu("选项");
mset.setBounds(0, 0, 20, 15);
JMenuItem mchange=new JMenuItem("修改用户名和密码");
JMenuItem madd=new JMenuItem("添加用户");
JMenuItem mopen=new JMenuItem("更换当前数据库");
caros.add(bar);
bar.add(mset);
mset.add(mchange);mset.add(madd);mset.add(mopen);
//添加菜单栏
mchange.addActionListener(new ActionListener() {
@SuppressWarnings("resource")
public void actionPerformed(ActionEvent e){
String oldpassword=JOptionPane.showInputDialog("请输入密码");
Connection conn = null;
Statement stmt = null;
try{
// 注册 JDBC 驱动
Class.forName(JDBC_DRIVER);
// 打开链接
System.out.println("连接数据库...");
conn = DriverManager.getConnection(DB_URL,USER,PASS);
// 执行查询
System.out.println(" 实例化Statement对象...");
stmt = conn.createStatement();
String sql;
sql = "SELECT ID, USERNAME, PASSWORD FROM logindb";
ResultSet rs = stmt.executeQuery(sql);
// 展开结果集数据库
while(rs.next()){
// 通过字段检索
int id= rs.getInt("id");
String name = rs.getString("USERNAME");
String password = rs.getString("PASSWORD");
if(oldpassword.equals(password)) {
String newname=JOptionPane.showInputDialog("请输入新用户名");
String newpassword=JOptionPane.showInputDialog("请输入新密码");
sql="UPDATE logindb SET USERNAME="+"\""+newname+"\""+" WHERE id="+id;
stmt.executeUpdate(sql);
sql="UPDATE logindb SET PASSWORD="+"\""+newpassword+"\""+" WHERE id="+id;
stmt.executeUpdate(sql);
JOptionPane.showMessageDialog(null,"更改成功！");
}
}
// 完成后关闭
rs.close();
stmt.close();
conn.close();
}catch(SQLException se){
// 处理 JDBC 错误
se.printStackTrace();
}catch(Exception e1){
// 处理 Class.forName 错误
e1.printStackTrace();
}finally{
// 关闭资源
try{
if(stmt!=null) stmt.close();
}catch(SQLException se2){
}
try{
if(conn!=null) conn.close();
}catch(SQLException se){
se.printStackTrace();
}
}
}
});
mopen.addActionListener(new ActionListener() {
@SuppressWarnings("resource")
public void actionPerformed(ActionEvent e){
String oldpassword=JOptionPane.showInputDialog("请输入密码");
Connection conn = null;
Statement stmt = null;
try{
// 注册 JDBC 驱动
Class.forName(JDBC_DRIVER);
// 打开链接
System.out.println("连接数据库...");
conn = DriverManager.getConnection(DB_URL,USER,PASS);
// 执行查询
System.out.println(" 实例化Statement对象...");
stmt = conn.createStatement();
String sql;
String newdb=JOptionPane.showInputDialog("请输入新数据库名");
sql = "use "+newdb;
ResultSet rs = stmt.executeQuery(sql);
JOptionPane.showMessageDialog(null,"操作成功！");
// 完成后关闭
rs.close();
stmt.close();
conn.close();
}catch(SQLException se){
// 处理 JDBC 错误
se.printStackTrace();
}catch(Exception e1){
// 处理 Class.forName 错误
e1.printStackTrace();
}finally{
// 关闭资源
try{
if(stmt!=null) stmt.close();
}catch(SQLException se2){
}
try{
if(conn!=null) conn.close();
}catch(SQLException se){
se.printStackTrace();
}
}
}
});
madd.addActionListener(new ActionListener() {
@SuppressWarnings("resource")
public void actionPerformed(ActionEvent e){
String oldpassword=JOptionPane.showInputDialog("请输入密码");
Connection conn = null;
Statement stmt = null;
try{
// 注册 JDBC 驱动
Class.forName(JDBC_DRIVER);
// 打开链接
System.out.println("连接数据库...");
conn = DriverManager.getConnection(DB_URL,USER,PASS);
// 执行查询
System.out.println(" 实例化Statement对象...");
stmt = conn.createStatement();
String sql;
sql = "SELECT ID, USERNAME, PASSWORD FROM logindb";
ResultSet rs = stmt.executeQuery(sql);
// 展开结果集数据库
while(rs.next()){
// 通过字段检索
int id= rs.getInt("id");
String name = rs.getString("USERNAME");
String password = rs.getString("PASSWORD");
if(oldpassword.equals(password)) {
String newname=JOptionPane.showInputDialog("请输入添加的新用户名");
String newpassword=JOptionPane.showInputDialog("请输入新用户的密码");
sql="insert into logindb (USERNAME,PASSWORD) VALUES ("+"\""+newname+"\""+","+"\""+newpassword+"\""+")";
stmt.executeUpdate(sql);
JOptionPane.showMessageDialog(null,"操作成功！");
}
}
// 完成后关闭
rs.close();
stmt.close();
conn.close();
}catch(SQLException se){
// 处理 JDBC 错误
se.printStackTrace();
}catch(Exception e1){
// 处理 Class.forName 错误
e1.printStackTrace();
}finally{
// 关闭资源
try{
if(stmt!=null) stmt.close();
}catch(SQLException se2){
}
try{
if(conn!=null) conn.close();
}catch(SQLException se){
se.printStackTrace();
}
}
}
});
//菜单栏活动
String[] columnNames = {"序号", "车牌号","车主姓名","车主电话","停放区域"};
DefaultTableModel model = new DefaultTableModel(columnNames,0);
JTable table = new JTable(model);
table.setBounds(370, 170, 570, 521);
JScrollPane tablecarry=new JScrollPane(table);
tablecarry.setBounds(370, 170, 570, 521);
caros.add(tablecarry);
//车辆信息表格
JButton allcar=new JButton("所有车辆");
allcar.setBounds(70, 60, 180, 40);
caros.add(allcar);
allcar.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
model.setRowCount( 0 );
search(model,0);
}
});
//所有车辆切换按钮
JButton alrdst=new JButton("已停放汽车");
alrdst.setBounds(70, 210, 180, 40);
caros.add(alrdst);
alrdst.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
model.setRowCount( 0 );
search(model,1);
}
});
//已停放汽车切换按钮
JButton ntst=new JButton("未停放汽车");
ntst.setBounds(70, 360, 180, 40);
caros.add(ntst);
ntst.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
model.setRowCount( 0 );
search(model,2);
}
});
//未停放汽车切换按钮
JButton alrdpy=new JButton("已缴费汽车");
alrdpy.setBounds(70, 510, 180, 40);
caros.add(alrdpy);
alrdpy.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
model.setRowCount( 0 );
search(model,3);
}
});
//已缴费汽车切换按钮
JButton ntpy=new JButton("未缴费汽车");
ntpy.setBounds(70, 660, 180, 40);
caros.add(ntpy);
ntpy.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
model.setRowCount( 0 );
search(model,4);
}
});
//未缴费汽车切换按钮
JTextField lookcar=new JTextField();
lookcar.setBounds(370, 60, 500, 40);
caros.add(lookcar);
//查询文本框
JButton lookbt=new JButton("查询汽车");
lookbt.setBounds(920, 60, 100, 40);
caros.add(lookbt);
lookbt.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
find=new String(lookcar.getText());
model.setRowCount( 0 );
search(model,5);
}
});
//查询按钮
caros.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
caros.setVisible(true);
//显示操作框架
}
}
});//登录事件
}
protected static JScrollPane JScrollPane(JTable table) {
// TODO 自动生成的方法存根
return null;
}
public static void loginos(String a,String b) {
Connection conn = null;
Statement stmt = null;
try{
// 注册 JDBC 驱动
Class.forName(JDBC_DRIVER);
// 打开链接
System.out.println("连接数据库...");
conn = DriverManager.getConnection(DB_URL,USER,PASS);
// 执行查询
System.out.println(" 实例化Statement对象...");
stmt = conn.createStatement();
String sql;
sql = "SELECT ID, USERNAME, PASSWORD FROM logindb";
ResultSet rs = stmt.executeQuery(sql);
// 展开结果集数据库
while(rs.next()){
// 通过字段检索
int id = rs.getInt("ID");
String name = rs.getString("USERNAME");
String password = rs.getString("PASSWORD");
if(name.equals(a)&&password.equals(b)) loginflag=1;
}
if(loginflag==1) {
JOptionPane.showMessageDialog(null, "登录成功");
}//登录操作
else {
JOptionPane.showMessageDialog(null, "用户名或者密码错误！");
}
// 完成后关闭
rs.close();
stmt.close();
conn.close();
}catch(SQLException se){
// 处理 JDBC 错误
se.printStackTrace();
}catch(Exception e){
// 处理 Class.forName 错误
e.printStackTrace();
}finally{
// 关闭资源
try{
if(stmt!=null) stmt.close();
}catch(SQLException se2){
}// 什么都不做
try{
if(conn!=null) conn.close();
}catch(SQLException se){
se.printStackTrace();
}
}
System.out.println("Goodbye!");
}
public static void search(DefaultTableModel model,int a) {
Connection conn = null;
Statement stmt = null;
try{
// 注册 JDBC 驱动
Class.forName(JDBC_DRIVER);
// 打开链接
System.out.println("连接数据库...");
conn = DriverManager.getConnection(DB_URL,USER,PASS);
// 执行查询
System.out.println(" 实例化Statement对象...");
stmt = conn.createStatement();
String sql;
sql = "SELECT id, carnum, name, phone, setpos, set_status, pay_status FROM carsinfo";
ResultSet rs = stmt.executeQuery(sql);
// 展开结果集数据库
switch(a) {
case 1:
while(rs.next()){
// 通过字段检索
Vector row=new Vector();
int id= rs.getInt("id");
String carnum = rs.getString("carnum");
String name = rs.getString("name");
String phone = rs.getString("phone");
String setpos = rs.getString("setpos");
int set_status = rs.getInt("set_status");
int pay_status = rs.getInt("pay_status");
if(set_status==1) {
row.add(id);row.add(carnum);row.add(name);row.add(phone);row.add(setpos);
model.addRow(row);
}
}
break;
case 2:
while(rs.next()){
// 通过字段检索
Vector row=new Vector();
int id= rs.getInt("id");
String carnum = rs.getString("carnum");
String name = rs.getString("name");
String phone = rs.getString("phone");
String setpos = rs.getString("setpos");
int set_status = rs.getInt("set_status");
int pay_status = rs.getInt("pay_status");
if(set_status==0) {
row.add(id);row.add(carnum);row.add(name);row.add(phone);row.add(setpos);
model.addRow(row);
}
}
break;
case 3:
while(rs.next()){
// 通过字段检索
Vector row=new Vector();
int id= rs.getInt("id");
String carnum = rs.getString("carnum");
String name = rs.getString("name");
String phone = rs.getString("phone");
String setpos = rs.getString("setpos");
int set_status = rs.getInt("set_status");
int pay_status = rs.getInt("pay_status");
if(pay_status==1) {
row.add(id);row.add(carnum);row.add(name);row.add(phone);row.add(setpos);
model.addRow(row);
}
}
break;
case 4:
while(rs.next()){
// 通过字段检索
Vector row=new Vector();
int id= rs.getInt("id");
String carnum = rs.getString("carnum");
String name = rs.getString("name");
String phone = rs.getString("phone");
String setpos = rs.getString("setpos");
int set_status = rs.getInt("set_status");
int pay_status = rs.getInt("pay_status");
if(pay_status==0) {
row.add(id);row.add(carnum);row.add(name);row.add(phone);row.add(setpos);
model.addRow(row);
}
}
break;
case 5:
while(rs.next()){
// 通过字段检索
Vector row=new Vector();
int id= rs.getInt("id");
String carnum = rs.getString("carnum");
String name = rs.getString("name");
String phone = rs.getString("phone");
String setpos = rs.getString("setpos");
int set_status = rs.getInt("set_status");
int pay_status = rs.getInt("pay_status");
if(carnum.equals(find)||name.equals(find)||phone.equals(find)||setpos.equals(find)) {
row.add(id);row.add(carnum);row.add(name);row.add(phone);row.add(setpos);
model.addRow(row);
}
}
break;
default:
while(rs.next()){
// 通过字段检索
Vector row=new Vector();
int id= rs.getInt("id");
String carnum = rs.getString("carnum");
String name = rs.getString("name");
String phone = rs.getString("phone");
String setpos = rs.getString("setpos");
int set_status = rs.getInt("set_status");
int pay_status = rs.getInt("pay_status");
row.add(id);row.add(carnum);row.add(name);row.add(phone);row.add(setpos);
model.addRow(row);
}
}
// 完成后关闭
rs.close();
stmt.close();
conn.close();
}catch(SQLException se){
// 处理 JDBC 错误
se.printStackTrace();
}catch(Exception e){
// 处理 Class.forName 错误
e.printStackTrace();
}finally{
// 关闭资源
try{
if(stmt!=null) stmt.close();
}catch(SQLException se2){
}
try{
if(conn!=null) conn.close();
}catch(SQLException se){
se.printStackTrace();
}
}
}
}
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