dengluck.java

程序名称（小型超市前台收款系统）压缩包内包含源文件和数据库

package chaoshi;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import java.awt.Image;
import java.awt.Graphics;
import java.applet.Applet;
public class dengluck extends Frame implements ActionListener{
        static public String zhanghao="";
        Label lhuanying=new Label("欢迎使用小型超市前台收款系统");
    	Label lzhanghao=new Label("输入帐号：");
	Label lmima=new Label("输入密码：");
	TextField tfzhanghao=new TextField("",16);
	TextField tfmima=new TextField("",16);
	Button bdenglu=new Button("登陆");
    public dengluck() {
        super("登陆");
	setLayout(null);
	setSize(400,300);
        setResizable(false);
	setLocation(300,100);
        this.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e){
				System.exit(0);
			}
		});
        add(lhuanying);
        lhuanying.setBounds(1, 50, 400,20);
        lhuanying.setAlignment(java.awt.Label.CENTER);
	tfmima.setEchoChar('*');
	add(lzhanghao);
	lzhanghao.setBounds(130,90,60,20);
	add(tfzhanghao);
	tfzhanghao.setBounds(190,90,80,20);
        tfzhanghao.addActionListener(this);
	add(lmima);
	lmima.setBounds(130,130,60,20);
	add(tfmima);
	tfmima.setBounds(190,130,80,20);
	add(bdenglu);
	bdenglu.setBounds(170,160,50,30);
	bdenglu.addActionListener(this);
        tfmima.addActionListener(this);
        tfmima.enableInputMethods(false);
	}
	public void actionPerformed(ActionEvent e){
            if(e.getSource()==tfzhanghao){
                tfmima.requestFocus();
            }
            if(e.getSource()==bdenglu||e.getSource()==tfmima){
		String drivers="sun.jdbc.odbc.JdbcOdbcDriver";
		String url="jdbc:odbc:chaoshi";
		try
		{
			Class.forName(drivers);
			Connection con=DriverManager.getConnection(url);
			Statement stmt=con.createStatement();
			String sql="select 帐号,密码,权限  from zhb where 帐号='"+tfzhanghao.getText()+"' and 密码='"+tfmima.getText()+"'";
			ResultSet rs=stmt.executeQuery(sql);
                         if(rs.next()){
                            zhanghao=rs.getString(1);
                            if(rs.getString("权限").equals("收银员")) {
                                new syyck(zhanghao).setVisible(true);
                            }
                            else {
                                new glyck(zhanghao).setVisible(true);
                            }
                            this.setVisible(false);
                         }
                         else{
                            new dcuowu(this, true);
                         }
                        rs.close();

			stmt.close();
			con.close();
			
		}
		catch(java.lang.Exception e1){
			e1.printStackTrace();
		}
            }


    }
class dcuowu extends Dialog implements ActionListener{
    Label lcuowu=new Label("用户名或密码错误！");
    Button bqueding =new Button("确定");
    dcuowu(dengluck parent,boolean model){
        super(parent,model);
	setTitle("错误");
	setSize(300,120);
	setResizable(false);
	setLayout(null);
	setLocation(350,200);
        add(lcuowu);lcuowu.setAlignment(java.awt.Label.CENTER);lcuowu.setBounds(0, 50, 300, 22);
        add(bqueding);bqueding.setBounds(120, 80, 57, 26);
        addWindowListener(new WindowAdapter(){
				public void windowClosing(WindowEvent e2){
					dispose();
				}
			});
        bqueding.addActionListener(this);
        setVisible(true);



    }
    
    public void actionPerformed(ActionEvent e){
        if(e.getSource()==bqueding){
            tfmima.setText("");
            dispose();
        }
    }

}

}