该代码示例展示了使用JavaSwing构建的考试系统登录界面和答题功能。用户输入用户名和密码进行登录，登录信息从MySQL数据库验证。登录成功后，用户可以进行答题，系统有计时功能。答题界面包含单选题和答题操作按钮，如上一题、下一题和提交。
该项目包括登录功能,答题功能和记时功能,答对题则可以加分.(只发了部分代码)
package E;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.sql.*;
import java.util.Enumeration;
import shixun2.ExamJFrame;
import javax.swing.*;
import javax.swing.plaf.FontUIResource;
public class Login extends Frame implements ActionListener
{
Label lbuser,lbpwd,k;
Label lbinstrution=new Label("抱歉,该用户名不存在!");
Label lbinstrution1=new Label("抱歉,该用户口令不正确!");
TextField tfuser,tfpwd;
Button btnok,btnreg;
String s1,s2;//用来取文本框中的字符串.
public Login()
{
super("考生登录系统界面");
setBounds(340,190,400,300);
setLayout(null);
setVisible(true);
setBackground(Color.pink);
k=new Label("考生登陆界面");
k.setFont(new Font("华文行楷",Font.BOLD,20));
lbinstrution.setFont(new Font("华文行楷",Font.BOLD,14));
lbinstrution1.setFont(new Font("华文行楷",Font.BOLD,14));
lbuser=new Label("用户名",Label.CENTER);
lbuser.setFont(new Font("华文行楷",Font.BOLD,12));
lbpwd=new Label("口 令",Label.CENTER);
lbpwd.setFont(new Font("华文行楷",Font.BOLD,12));
tfuser=new TextField(16);
tfpwd=new TextField(16);
tfpwd.setEchoChar('*');
btnok=new Button("登录");
btnok.setForeground(Color.red);
btnok.setFont(new Font("华文行楷",Font.BOLD,12));
btnok.setBackground(new Color(213,219,246));
btnreg=new Button("注册");
btnreg.setForeground(Color.red);
btnreg.setFont(new Font("华文行楷",Font.BOLD,12));
btnreg.setBackground(new Color(213,219,246));
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
dispose();
System.exit(0);
}
});
add(lbinstrution);add(lbinstrution1);
add( lbuser);add( lbpwd);
add(tfuser); add(tfpwd);//添加组件
add(btnok); add(btnreg);
add(k);
lbinstrution.setBounds(140,180,160,18);
lbinstrution.setForeground(Color.BLACK);
lbinstrution1.setBounds(140,180,160,18);
lbinstrution1.setForeground(Color.BLACK);;
k.setBounds(140, 50, 160, 50);
k.setForeground(Color.GREEN);
lbuser.setBounds(100, 100, 70, 20);
lbpwd.setBounds(100,150,65,17);
tfuser.setBounds(190,100,100,20);
tfpwd.setBounds(190,150,100,20);
btnok.setBounds(100,220,60,20);
btnreg.setBounds(260,220,60,20);
lbinstrution.setVisible(false);
lbinstrution1.setVisible(false);
btnok.addActionListener(this);//添加系列监听器
btnreg.addActionListener(this);//添加系列监听器
}
public static void main(String[] args)
{
Login f=new Login();
}
private static void InitGlobalFont(Font font) {
FontUIResource fontRes = new FontUIResource(font);
for (Enumeration<Object> keys = UIManager.getDefaults().keys(); keys.hasMoreElements();) {
Object key = keys.nextElement();
Object value = UIManager.get(key);
if (value instanceof FontUIResource) {
UIManager.put(key, fontRes);
}
}
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==btnok)
{if(tfuser.getText().equals("")&&tfpwd.getText().equals(""))
JOptionPane.showMessageDialog(null, "用户名和密码不能为空");
else{
s1=tfuser.getText();s2=tfpwd.getText();
try {
Class.forName("com.mysql.jdbc.Driver");
String url="jdbc:mysql://127.0.0.1:3306/mytest?useUnicode=true&characterEncoding=utf-8";
String user="root";
String password="123";
Connection con=DriverManager.getConnection(url,user,password);
Statement fsg=con.createStatement();
ResultSet rsuser=fsg.executeQuery("select username,password from admin ");
while(rsuser.next())
{
String rs=rsuser.getString("username");
String rs2=rsuser.getString("password");
if(s1.equals(rs)&&(s2.equals(rs2)))//只有用户名与密码都与之匹配才能进入考试
{new ExamJFrame();
System.out.println("successs");
break;}
if((s1.equals(""))&&(!(s2.equals(rs))))//提示你没有用户名.//取不等的方法直接在前面加"!".
{lbinstrution.setVisible(true);}
if((s1.equals(rs))&&(!s2.equals(rs2)))//提示你你的密码错误.
{lbinstrution1.setVisible(true);
}
}
rsuser.close();
fsg.close();
con.close();
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}//if的结束标记符.
if (e.getSource()==btnreg)
new Register( );
}
}
package shixun2;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.plaf.FontUIResource;
/*
* 主窗体
*/
public class ExamJFrame extends JFrame implements Runnable {
JMenuBar jmb;
JMenu jm,jm2;
JMenuItem jmi1,jmi2;
JPanel jp1;
JLabel jlb,lbtime;//题目
JRadioButton jr1,jr2,jr3;//四个选项的单选按钮
JButton jb1,jb2,jb3;//三个按钮，上一题、下一题、提交
JPanel jp2;//用来放三个按钮
ButtonGroup bg;//按钮组，实现单选按钮的排斥
JTextArea jta;
ArrayList<zsx> list;
zsx c;
shixun4 v;
int index;
int totaltime=5400;
Thread f;
public ExamJFrame(){
setTitle("考试系统");
setSize(700, 500);
f=new Thread(this);
setLocationRelativeTo(null);
InitGlobalFont(new Font("黑体", Font.PLAIN, 20));
init();
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
jmi1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
if(!f.isAlive())
{ f.start();}
init2();
list=v.find();
index = 0;
printjm(index);
jb1.setEnabled(false);
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
});
jmi2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
init3();
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
});
}
//定义查询记录的界面
public void init3() throws ClassNotFoundException, SQLException {
jp1.removeAll();
jp1.setLayout(new BorderLayout());
jta=new JTextArea();
JScrollPane jsp=new JScrollPane(jta);
jp1.add(jta);
ArrayList <recod> lis=v.findAll();
for(int i=0;i<lis.size();i++){
recod zx=lis.get(i);
String str="姓名:"+zx.getname()+" "+"成绩:"+zx.getscore()+" ";
jta.append(str);
}
}
//设置初始界面
public void init() {
jmb=new JMenuBar();
jm=new JMenu("考试");
jm2=new JMenu("考试记录");
jmi1=new JMenuItem("开始考试");
jmi2=new JMenuItem("查询所有考试记录");
lbtime=new JLabel("计时:");
jm.add(jmi1);
jm2.add(jmi2);
jmb.add(jm);
jmb.add(jm2);
jmb.add(new JLabel(" "));
jmb.add(lbtime);
setJMenuBar(jmb);
jp1=new JPanel();
add(jp1);
jmb.add(lbtime);
lbtime.setForeground(Color.red);
}
//考试时候的组件布局
public void init2(){
jp1.removeAll();
//设置面板的布局为网格布局，只有一列
jp1.setLayout(new GridLayout(0,1));
jlb=new JLabel("题目");
jr1=new JRadioButton("1");
jr2=new JRadioButton("2");
jr3=new JRadioButton("3");
//单选按钮要实现互相排斥，多选一，ButtonGroup按钮组
bg=new ButtonGroup();
bg.add(jr1);
bg.add(jr2);
bg.add(jr3);
jp2=new JPanel();
jb1=new JButton("上一题");
jb2=new JButton("下一题");
jb3=new JButton("提交");
jp2.add(jb1);
jp2.add(jb2);
jp2.add(jb3);
//中间的大面板jp1添加组件
//滚动条面板添加jlb
jp1.add(new JScrollPane(jlb));
jp1.add(jr1);
jp1.add(jr2);
jp1.add(jr3);
jp1.add(jp2);
jb2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
save(index);
index++;
printjm(index);
jb1.setEnabled(true);
if(index>=list.size()-1){
jb2.setEnabled(false);
}
}
});
jb1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
save(index);
index--;
printjm(index);
jb2.setEnabled(true);
if(index<1){
jb1.setEnabled(false);
}
}
});
jb3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
save(index);
int sum=0,u=0;
String se = " ";
for(int i=0;i<list.size();i++){
if(list.get(i).getuseran()!=null)
{
u++;
}
else{
se+=(i+1)+" ";
}
}
if(u!=0){
JOptionPane.showMessageDialog(null, "你的第"+se+"道题没有作答，请前去看看");
}
if(u==0){
for(int i=0;i<list.size();i++){
if(list.get(i).getuseran().equals(list.get(i).getanswer())){sum+=10;
}
}
String name=JOptionPane.showInputDialog("请输入你的名字");
JOptionPane.showMessageDialog(null, name+"你的成绩是"+sum+"分");
recod re=new recod();
re.setname(name);
re.setscore(sum);
v.addrecord(re);
}
}
});
this.validate();
}
/**
* 统一设置字体，父界面设置之后，所有由父界面进入的子界面都不需要再次设置字体
*/
private static void InitGlobalFont(Font font) {
FontUIResource fontRes = new FontUIResource(font);
for (Enumeration<Object> keys = UIManager.getDefaults().keys(); keys.hasMoreElements();) {
Object key = keys.nextElement();
Object value = UIManager.get(key);
if (value instanceof FontUIResource) {
UIManager.put(key, fontRes);
}
}
}
public void printjm (int index){
c=list.get(index);
jlb.setText(index+1+"."+c.gettitle());
jr1.setText(c.getsd());
jr2.setText(c.getsc());
jr3.setText(c.getsa());
String useran=c.getuseran();
if(useran!=null){
switch(useran){
case "A":jr1.setSelected(true);break;
case "B":jr2.setSelected(true);break;
case "C":jr3.setSelected(true);break;
}
}
validate();
}
public void save(int index) {
String useran=null;
if(jr1.isSelected()){useran="A";}
if(jr2.isSelected()){useran="B";}
if(jr3.isSelected()){useran="C";}
c.setuseran(useran);
list.set(index,c);
bg.clearSelection();
}
public static void main(String[] args) {
new ExamJFrame();
}
@Override
public void run() {
while(true)
{
totaltime--;
long hour=totaltime/3600%60;
long minute=totaltime/60%60;
long second=totaltime%60;
lbtime.setText("计时:"+hour+":"+minute+":"+second+" "+"少年加油吧！");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
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