简单的登录界面

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.Statement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;


import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class textpass extends JFrame implements ActionListener {
private JPanel jp=new JPanel();
private JLabel[] jlArray={new JLabel("用户名"),
new JLabel("密　码"),new JLabel("")};
private JButton[] jbArray={new JButton("登陆"),
new JButton("清空")};
private JTextField jtxtName =new JTextField();
private JPasswordField jtxtPassword= new JPasswordField();
public textpass(){
jp.setLayout(null);
for(int i=0;i<2;i++){
jlArray[i].setBounds(30, 20+i*50, 80, 26);
jbArray[i].setBounds(50+i*110, 130, 80,26);
jp.add(jlArray[i]);
jp.add(jbArray[i]);
jbArray[i].addActionListener(this);
}
jtxtName.setBounds(80,20,180,30);
jp.add(jtxtName);
jtxtName.addActionListener(this);
jtxtPassword.setBounds(80,70,180,30);
jp.add(jtxtPassword);
jtxtPassword.setEchoChar('*');
jtxtPassword.addActionListener(this);
jlArray[2].setBounds(10, 180, 300, 30);
jp.add(jlArray[2]);
this.add(jp);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setTitle("登陆");
this.setResizable(false);
this.setBounds(100, 100, 300, 250);
this.setVisible(true);
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==jtxtName){
jtxtPassword.requestFocus();
}else if(e.getSource()==jbArray[1]){
jlArray[2].setText("");
jtxtName.setText("");
jtxtPassword.setText("");
jtxtName.requestFocus();
}else{
String driverName="com.microsoft.sqlserver.jdbc.SQLServerDriver";
String dbURL="jdbc:sqlserver://localhost:1433;DatabaseName=chatrecord";//端口号可以自己看sql server服务器的端口号，每个人的都不一样的，否则会抛出异常
String userName="sa";
String userPwd="******";此处为登录sql server的密码
try
{
Class.forName(driverName);
System.out.println("加载驱动成功！");
}catch(Exception a){
a.printStackTrace();
System.out.println("加载驱动失败！");
}
try{
Connection dbConn=DriverManager.getConnection(dbURL,userName,userPwd);
System.out.println("连接数据库成功！");
String sql1="select usrname from usps ";
String sql2="select password from usps";
if(jtxtName.getText().equals(sql1)&&String.valueOf(jtxtPassword.getPassword()).equals(sql2))
{
jlArray[2].setText("登陆成功");
}

else{
jlArray[2].setText("登陆错误");
}
}catch(Exception a)
{
a.printStackTrace();
System.out.print("SQL Server连接失败！");

}
}
}
public static void main(String[] args) {
new textpass();
}

}

结果显示如下：