smislogin.java

来自「用java2核心类库写的一个学生课程管理系统」· Java 代码 · 共 155 行

/**
 * @(#)smisLogin.java
 *
 *
 * @author 
 * @version 1.00 2008/3/5
 */
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class smisLogin
{
	private int checkCount;
	private String user = null;
	private String password = null;

	private JFrame f;
	private JPanel content;
	private JLabel userLabel;
    private JLabel passwordLabel;
    private JTextField userText;
    private JPasswordField passwordText;
    private JButton confirmBtn;
    private JButton concleBtn;
	
    private final String superUser = "superuser";
    private final String superPassword = "super123";
    
    private static final smisLogin login = new smisLogin();

	public static smisLogin singleSmisLogin()
	{
		return login;
	} 
	
    private smisLogin()
    {
    	user = null;
    	password = null;
    	
    	//初始化窗口
    	initMainFrame();

    	//为button注册监听器
    	ClickActionListener  cal = new ClickActionListener();
    	confirmBtn.addActionListener(cal);
    	concleBtn.addActionListener(cal);

    	//为窗口注册监听器
    	f.addWindowListener(new WindowAdapter()
    	{
    		public void windowClosing(WindowEvent e)
    		{
    			e.getWindow().setVisible(false);
    			((Window)e.getComponent()).dispose();
    			System.exit(0);
    		}
    	});
    }
    
    private void initMainFrame()
    {
    	checkCount = 0;
    	f = new JFrame("登录");
    	content = new JPanel();
	    userLabel = new JLabel("用户名:        ",JLabel.LEFT);
        passwordLabel = new JLabel("密码:    ",JLabel.LEFT);
        userText = new JTextField(10);
        passwordText = new JPasswordField(10);
        passwordText.setEchoChar('*');
        confirmBtn = new JButton("确定");
        concleBtn = new JButton("取消");
        

        content.add(userLabel);
    	content.add(userText);
    	content.add(passwordLabel);
    	content.add(passwordText);
    	content.add(confirmBtn);
    	content.add(concleBtn);
    	
    	content.setLayout(new FlowLayout());

    	f.add(content);
    	f.setSize(300,300);

    	f.setVisible(true);
    }
    
    //内部类,用来处理按钮的action event
    class ClickActionListener implements ActionListener  
    {    
	    public void actionPerformed(ActionEvent e)
	    {
	    	System.out.println("insert button is click3");
	    	if (e.getActionCommand() == "确定")
	    	{
	    		System.out.println("insert button is 确定");
	    		user = userText.getText();
	    		password = passwordText.getText();
	    		System.out.println("user = " + user + ", password = " + password);
	    		
	    		if ( (user.equals(superUser)) && (password.equals(superPassword)) )
	    		{
	    			// super user login success
	    			f.setVisible(false);
	    			smisMainFrame.singleMainFrame().setMenuManageUser(user,password);
	    		}
	    		else
	    		{
	    		    String sqlSelectUser = "select 用户名, 密码 from 用户信息";
	    		    SMISDB userDB = new SMISDB();
	    		
	    		    int confirmSuccess = 0;
	    		    confirmSuccess = userDB.login(sqlSelectUser,user, password);
	    		    System.out.println("-----------------confirmSuccess == " + confirmSuccess);
	    		    if ( confirmSuccess == 1)
	    		    {
	    			    f.setVisible(false);
	    			    smisMainFrame.singleMainFrame().setMenuManageUser(user,password);
	    		    }
	    		    else if ( confirmSuccess == -1)
	    		    {
	    			    checkCount++;
	    			    if ( checkCount <3)
	    			    {
	    				    JOptionPane.showMessageDialog(f,"用户名或密码有误，请重新输入！");
	    			    }
	    			    else
	    			    {
	    				    JOptionPane.showMessageDialog(f,"已输入３次，系统将退出！");
	    				    System.exit(0);
	    			    }
	    		    }
	    		    
	    		    else
	    		    {
	    			    //SQLException 
	    		    }
	    		}
	    	}
	    	else if (e.getActionCommand() == "取消")
	    	{
	    		System.out.println("insert button is 取消");
	    		
        		System.exit(0);
	    	}
	    }
    }    
}