（1）登录页面

package hotel;

import java.awt.Color;

import java.awt.Font;

import java.awt.Image;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JPasswordField;

import javax.swing.JTextField;

public class Hotel_login extends JFrame {

private static final long serialVersionUID = -7471068353439295951L;

private JButton okbutton, quitbutton, hidebutton;

JTextField utext;

JPasswordField ptext;

private JLabel username, password, Toptext;

public Hotel_login() {

super("Hotel_login");

setBounds(750, 200, 600, 490);

setLayout(null);

okbutton = new JButton("登录");

okbutton.setSize(235, 38);

okbutton.setLocation(180, 314);

okbutton.setContentAreaFilled(false); // 设置按钮透明

utext = new JTextField();

ptext = new JPasswordField();

utext.setSize(180, 29);

utext.setLocation(220, 173);

ptext.setSize(180, 29);

ptext.setLocation(220, 213);

username = new JLabel("用户名:");

username.setForeground(Color.yellow);

username.setFont(new Font("", 1, 16));

username.setSize(60, 40);

username.setLocation(150, 244);

password = new JLabel("密   码:");

password.setForeground(Color.yellow);

password.setFont(new Font("BLOD", 1, 16));

password.setSize(60, 40);

password.setLocation(150, 300);

Toptext = new JLabel("酒店管理系统登录");

Toptext.setForeground(Color.yellow);

Toptext.setSize(400, 180);

Toptext.setLocation(195, 25);

Toptext.setFont(new Font("", 1, 25));

setUndecorated(true); // 窗口标题栏

Toolkit tk = Toolkit.getDefaultToolkit();

Image img = tk.getImage("E:\\javaspace\\酒店\\src\\登录界面.png");

setIconImage(img);

okbutton.addActionListener(new ActionListener() {

@SuppressWarnings("deprecation")

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

if (utext.getText().trim().equalsIgnoreCase("1") && ptext.getText().trim().equalsIgnoreCase("1")) {

new JOptionPane();

Main_Activity main = new Main_Activity();

main.setVisible(true);

dispose();

} else if (utext.getText().trim().equalsIgnoreCase("") && ptext.getText().trim().equalsIgnoreCase("")) {

JOptionPane.showMessageDialog(null, "请输入用户名和密码!", "tips", JOptionPane.ERROR_MESSAGE);

} else {

JOptionPane.showMessageDialog(null, "用户名或密码错误!", "tips", JOptionPane.ERROR_MESSAGE);

}

}

});

add(utext);

add(ptext);

add(okbutton);

add(Toptext);

// 添加关闭图标

ImageIcon image1 = new ImageIcon("D:\\酒店管理\\酒店\\src\\关闭按钮.png");

quitbutton = new JButton(image1);

quitbutton.setBounds(580, 0, 20, 20);

quitbutton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

dispose();

}

});

ImageIcon image2 = new ImageIcon("D:\\酒店管理\\酒店\\src\\hide.png");

hidebutton = new JButton(image2);

hidebutton.setBounds(560, 0, 20, 20);

hidebutton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

setExtendedState(JFrame.ICONIFIED); // 实现窗口最小化

}

});

// 非JPanel方法添加图标

ImageIcon image = new ImageIcon("D:\\酒店管理\\酒店\\src\\登录界面.png"); // project/Android_First/Hotel/src/Hotel/Hotel.png

JLabel imagelabel = new JLabel(image);

imagelabel.setSize(600, 450);

imagelabel.setLocation(0, 0);

add(imagelabel);

add(quitbutton);

add(hidebutton);

setVisible(true);

}

JPanel mainPanel = new JPanel();

public static void main(String[] args) {

new Hotel_login();

}

}

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