lasttest.java

一个学员信息管理系统小程序

import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import java.util.*;
import javax.swing.*;
import java.io.*;

/*
 * lastTest.java
 *
 * Created on 2004年11月7日, 上午2:17
 */

/**
 *
 * @author  aTom!c   陈冠栋
 */

public class lastTest
{
    public static void main(String[] args)
    {
        WelcomeFrame wframe = new WelcomeFrame();
        wframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        
        wframe.show();
    }
}

class WelcomeFrame extends JFrame       //登陆窗口
{
    public WelcomeFrame()
    {
        setTitle("学生信息管理系统");
        setBounds(150,150,300,200);
        setResizable(false);
        
        WelcomePanel wpanel = new WelcomePanel(this);
        getContentPane().add(wpanel);
    }
}

class WelcomePanel extends JPanel
{
    protected Hashtable date;
    private final  JTextField num_t;
    private final  JPasswordField psd_t;
    private final   JButton login,cancel,reg;
    private int i = 0;
    
    public WelcomePanel(final WelcomeFrame a)
    {
        setLayout(new GridBagLayout());
        date = new Hashtable();
        date.put("6666","asdf");
        JLabel num = new JLabel("学号：");
        JLabel psd = new JLabel("密码：");
        num_t = new JTextField(10);
        num_t.requestFocus();
        psd_t = new JPasswordField(10);
        login = new JButton("登陆(L)");
        login.setMnemonic('L');
        login.setToolTipText("登陆系统");
        cancel = new JButton("取消(C)");
        cancel.setMnemonic('C');
        cancel.setToolTipText("重新输入");
        reg = new JButton("注册(R)");
        reg.setMnemonic('R');
        reg.setToolTipText("注册用户");
        
        GridBagConstraints con = new GridBagConstraints();         //布局管理
        con.weighty = 1;
        con.anchor = GridBagConstraints.SOUTH;
        addCompent(num,con,0,0,1,1);
        addCompent(num_t,con,1,0,2,1);
        con.anchor = GridBagConstraints.CENTER;
        addCompent(psd,con,0,1,1,1);
        addCompent(psd_t,con,1,1,2,1);
        addCompent(login,con,0,2,1,1);
        addCompent(cancel,con,1,2,1,1);
        addCompent(reg,con,2,2,1,1);
        
        a.addWindowListener(new WindowAdapter()
        {
           public void windowActivated (WindowEvent e) 
           {
               num_t.requestFocus();
           }
        });
        
        num_t.addKeyListener(new KeyAdapter()           //控制输入的字符
        {
            public void keyTyped(KeyEvent e)
            {
                char ch = e.getKeyChar();
                if (ch < '0' || ch > '9')
                {
                    if (ch != '\b')
                    {
                        e.consume();
                    }
                }
            }
        });
        
        num_t.addFocusListener(new FocusAdapter()
        {
            public void focusLost(FocusEvent e)
            {
                if ((num_t.getText().length() < 4) && (num_t.getText().length() > 0))
                {
                    int l = 4 - num_t.getText().length();
                    for (int k = 0;k < l;k++)
                    {
                        num_t.setText("0"+num_t.getText());
                    }
                }
            }
        });
        
        psd_t.addActionListener(new ActionListener()         //密码框里按回车等于按登陆按钮
        {
            public void actionPerformed(ActionEvent e)
            {
                login.doClick();
            }
        });
        
        login.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                try
                {
                    checkDate();           //检查学号格式
                }
                catch (TextException e1)
                {
                    e1.display();
                    cancel.doClick();
                }
                catch (PsdException e2)
                {}
                
                if (date.containsKey(num_t.getText()))
                {
                    Object obj = date.get(num_t.getText());
                    if (obj.toString().equals(psd_t.getText()))             //验证密码
                    {
                        i = 0;
                        MainFrame mframe = new MainFrame(num_t.getText(),a);
                        mframe.addWindowListener(new WindowAdapter()
                        {
                            public void windowClosing(WindowEvent e)
                            {
                                System.exit(0);
                            }
                        });
                        mframe.show();
                        psd_t.setText("");
                        num_t.setText("");
                        a.setVisible(false);
                    }
                    else                      //密码输入错误判断
                    {
                        i++;
                        if (i<4)              //密码输入错误次数控制
                        {
                            JOptionPane.showMessageDialog(null,"密码错误！请重新输入密码！","注意",2);
                            psd_t.setText("");
                            psd_t.requestFocus();
                        }
                        else
                        {
                            JOptionPane.showMessageDialog(null,"输入错误密码次数过多，程序关闭！","错误",1);
                            System.exit(0);
                        }
                    }
                }
                else
                {
                    if (num_t.getText().length() > 1)
                    {
                        int l = JOptionPane.showConfirmDialog(null,"你并不是合法用户，需要注册吗？","选择操作",0,3);
                        if (l == 0)
                        {
                            reg.doClick();
                            login.doClick();
                        }
                        else
                        {
                            cancel.doClick();
                        }
                    }
                }
            }
        });
        
        cancel.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                num_t.setText("");
                psd_t.setText("");
                num_t.requestFocus();
            }
        });
        
        reg.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                try                            //注册时同时验证学号和密码
                {
                    checkDate();
                    if (date.containsKey(num_t.getText()))
                    {
                        JOptionPane.showMessageDialog(null,"你申请的学号已被注册！请重新选择！","警告",2);
                        cancel.doClick();
                    }
                    else
                    {
                        date.put(num_t.getText(),psd_t.getText());
                        JOptionPane.showMessageDialog(null,"注册成功！谢谢！","恭喜",1);
                    }
                }
                catch (TextException e1)
                {
                    e1.display();
                    cancel.doClick();
                }
                catch (PsdException e2)
                {
                    e2.display();
                    psd_t.setText("");
                    psd_t.requestFocus();
                }
            }
        });
    }
    
    public void addCompent(Component c,GridBagConstraints gc,int x,int y,int w,int h)
    {
        gc.gridx = x;
        gc.gridy = y;
        gc.gridwidth = w;
        gc.gridheight = h;
        add(c,gc);
    }
    
    public void checkDate() throws PsdException,TextException
    {
        if ((num_t.getText().length() > 4) || (num_t.getText().length() < 1 ))