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用户登录

import java.awt.*;

import java.awt.event.*;

import javax.swing.*; import java.sql.*;

public class UserLogin extends JFrame implements ActionListener

{

private static final long serialVersionUID = 1L;

String name;

DataBaseManger db=new DataBaseManger();

MainWindow mainFrame;

JFrame f=null;

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.CENTER);

setSize(300,180);

JLabel JL=new JLabel(" 图书馆欢迎您",SwingConstants.CENTER);

c.add(JL,"North");

c.add(panel1,"Center");

c.add("South",panel2);

panel1.setBackground(new Color(255,153,255));

setLocation(400,150);

}

public void actionPerformed(ActionEvent e)

{

if(e.getSource()==CancelBtn)

{

this.dispose();

}

else

{

char[] password=PasswordTextField.getPassword();

String passwordSTR=new String(password);

String strSQL;

strSQL="select * from users where uname='"+

UserTextField.getText().trim()+"'and upassword='"+

passwordSTR+"'";

rs=db.getResult(strSQL);

boolean isExist=false;

try

{

rs.next();

mainFrame.loginNo=rs.getString(1);

name=rs.getString(2);

mainFrame.loginName=name;

int right;

right=rs.getInt(4);

mainFrame.setenabled(right); if(name.length()!=0)

isExist=true;

}

catch(Exception pe)

{

pe.printStackTrace();

}

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;

}

if(!isExist)

{

JOptionPane.showMessageDialog(null,"用户名不存在或者密码不正确!");

}

else

{

JOptionPane.showMessageDialog(null,"登录成功");

this.dispose();

}

}

}

}