www.pudn.com > sjkjjwsu.store.rar > UserLogin.java

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import java.sql.*; 
public class UserLogin extends JFrame implements ActionListener 
{ 
	DataBaseManager db=new DataBaseManager(); 
	MainWindow mainFrame; 
	JPanel panel1,panel2; 
	JLabel UserLabel,PasswordLabel; 
	JTextField UserTextField; 
	JPasswordField PasswordTextField; 
	JButton YesBtn,CancelBtn; 
	Container c; 
	ResultSet rs; 
	public UserLogin(MainWindow mainFrame) 
	{ 
		super("用户登录"); 
		this.mainFrame=mainFrame; 
		UserLabel=new JLabel("用户名",JLabel.CENTER); 
		PasswordLabel=new JLabel("密码",JLabel.CENTER); 
		UserTextField=new JTextField(10); 
		PasswordTextField=new JPasswordField(10); 
		YesBtn=new JButton("确定"); 
		CancelBtn=new JButton("取消"); 
		YesBtn.addActionListener(this); 
		CancelBtn.addActionListener(this); 
		panel1=new JPanel(); 
                panel1.setLayout(new GridLayout(2,2)); 
		panel2=new JPanel(); 
		c=getContentPane(); 
		c.setLayout(new BorderLayout()); 
                panel1.add(UserLabel); 
                panel1.add(UserTextField); 
                panel1.add(PasswordLabel); 
                panel1.add(PasswordTextField); 
		c.add(panel1,BorderLayout.CENTER); 
		panel2.add(YesBtn); 
		panel2.add(CancelBtn); 
		c.add(panel2,BorderLayout.SOUTH); 
		setSize(300,300); 
	} 
	public void actionPerformed(ActionEvent e) 
	{ 
		if(e.getSource()==CancelBtn) 
		{ 
			mainFrame.setEnable("else"); 
			this.dispose(); 
		} 
		else 
		{ 
			char[] password=PasswordTextField.getPassword(); 
			String passwordSTR=new String(password); 
			if(UserTextField.getText().trim().equals("")) 
			{ 
				JOptionPane.showMessageDialog(null,"用户名不可为空!"); 
				return; 
			} 
			if(passwordSTR.equals("")) 
			{ 
				JOptionPane.showMessageDialog(null,"密码不可为空!"); 
				return; 
			} 
			String strSQL; 
			strSQL="select * from usertable where UserName='"+ 
			       UserTextField.getText().trim()+"'and Password='"+ 
			       passwordSTR+"'"; 
			rs=db.getResult(strSQL); 
			boolean isExist=false; 
			try 
			{ 
				isExist=rs.first(); 
			} 
			catch(SQLException sqle) 
			{ 
				System.out.println(sqle.toString()); 
			} 
			if(!isExist) 
			{ 
				JOptionPane.showMessageDialog(null,"用户名不存在或者密码不正确!"); 
				mainFrame.setEnable("else"); 
			} 
			else 
			{ 
				try 
				{ 
					rs.first(); 
					mainFrame.setEnable(rs.getString("power").trim()); 
					db.closeConnection(); 
					this.dispose(); 
				} 
				catch(SQLException sqle2) 
				{ 
					System.out.println(sqle2.toString()); 
				} 
			} 
			 
		} 
	} 
}