src/com/zzk/frame/LoginFrame.java

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package com.zzk.frame;

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.Insets;
import java.awt.Toolkit;
import java.net.URL;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;

import com.zzk.dao.UserDao;
import com.zzk.panel.BackgroundPanel;

public class LoginFrame extends JFrame {

    private static final long serialVersionUID = 1L;
    private URL url = null;// 声明图片的URL
    private Image image = null;// 声明图像对象
    private BackgroundPanel jContentPane = null;// 声明背景面板
    private JTextField tf_user = null;
    private JPasswordField pf_pwd = null;
    private JLabel jLabel = null;
    private JLabel jLabel1 = null;
    private JPanel jPanel = null;
    private JButton btn_ok = null;
    private JButton jButton1 = null;
    private JLabel jLabel2 = null;

    /**
     * This method initializes tf_user
     * 
     * @return javax.swing.JTextField
     */
    private JTextField getTf_user() {
        if (tf_user == null) {
            tf_user = new JTextField();
            tf_user.addActionListener(new java.awt.event.ActionListener() {
                @Override
                public void actionPerformed(java.awt.event.ActionEvent e) {
                    pf_pwd.requestFocus();
                }
            });
        }
        return tf_user;
    }

    /**