Eclipse 连接Mysql 数据库

因公司在开始开发BPM系统时用的是Mysql  开始我做一个连接数据库的小测试程序。

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

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class LoginFrame extends JFrame  implements ActionListener{

 JLabel label = new JLabel("请输入用户名和密码：");
 JTextField tfName = new JTextField("");  //输入用户名的文本框
 JPasswordField tfPassword = new JPasswordField(""); //输入密码的密码框
 JButton button = new JButton("登录");

 public LoginFrame()
 {
  this.setTitle("登录验证");
  button.addActionListener(this);
        this.getContentPane().setLayout(new GridLayout(4,1));
        this.getContentPane().add(label);
        this.getContentPane().add(tfName);
        this.getContentPane().add(tfPassword);
        this.getContentPane().add(button);
  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setSize(300,200);
        this.setLocation(200,300);
        this.setVisible(true);
 }
 
 public void actionPerformed(ActionEvent e)
   {
  try{
   /*
    * 连接MySQL数据库
    */
   Class.forName("org.gjt.mm.mysql.Driver");
   Connection conn=DriverManager.getConnection("jdbc:mysql://localhost/tbcn","root","1");     
   Statement stmt=conn.createStatement();
   String sql = "select * from account where username='" + tfName.getText() + "'";
      sql += " and password='" + tfPassword.getText() + "'";  //准备查询语句
      ResultSet rs=stmt.executeQuery( sql );
      if( rs.next() )
    label.setText("合法用户");  //身份验证通过ͨ��
         else
    label.setText("非法用户");  //身份验证没有通过��ͨ��
  }catch(Exception ee){
      ee.printStackTrace();
  }
 }
 public static void main(String[] args) {
  new LoginFrame();
 }
}