Swing中设置关闭窗口验证与添加背景图片

package com.swing.test;

import java.awt.EventQueue;
import java.awt.Image;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

/** *@Title BackGroundPic.java *@description TODO *@ time 2018-8-31 下午11:11:50 *@author Anderson *@version 1.0 */
public class BackGroundPic extends JFrame {
    private static final long serialVersionUID = 1L;

    private JPanel contentPane;//最大的Jpanel层
    private JLabel lblBackgroundl;//背景图片标签

    /** * Create the frame. */
    public BackGroundPic() {
        contentPane = new JPanel();
        setContentPane(contentPane);
        contentPane.setLayout(null);//绝对布局
        setResizable(false);//不允许用户自定义大小
        setSize(612 ,398);//设置Jpanel大小
        setLocationRelativeTo(null);//居中

        //设置点关闭后什么也不做.为添加关闭窗口验证做铺垫
        setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);

        /** * 为整个窗口添加退出确认,前提是 * setDefaultCloseOperation(DO_NOTHING_ON_CLOSE); */
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                int isExits = JOptionPane.showConfirmDialog(null, "确认退出吗?",
                        "Exit", JOptionPane.OK_CANCEL_OPTION,
                        JOptionPane.QUESTION_MESSAGE);
                if (isExits == JOptionPane.OK_OPTION) {
                    System.exit(0);
                }
            }
        });

/**********************设置背景图片***********************/
        /** * @author Administrator * getScaledInstance(width,height,hints); * //width,height,hints为方法中的参数 * width the width to which to scale the image. * height the height to which to scale the image. * hints flags to indicate the type of algorithm to use for image resampling. * //指示用于图像重新取样的算法类型的标志，指定缩放的比例算法 */
        ImageIcon background = new ImageIcon("./img/login_box.jpg");
        background.setImage(
                background.getImage().getScaledInstance(
                        background.getIconWidth(), background.getIconHeight(),
                        Image.SCALE_DEFAULT
                        )
                );
        lblBackgroundl = new JLabel();
        lblBackgroundl.setBounds(0, 0, 608, 369);
        lblBackgroundl.setIcon(background);
        lblBackgroundl.setHorizontalAlignment(0);
        getContentPane().add(lblBackgroundl);
        System.out.println(
        "图片宽: "+background.getIconWidth() + 
        "高:" + background.getIconHeight() 
        );
/**********************以上,设置背景图片***********************/    

    }


    /** * Launch the application. */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    BackGroundPic frame = new BackGroundPic();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

}

字符串下拉框的设置

private static JComboBox<String> cobAuth;

cobAuth = new JComboBox<String>();
cobAuth.setBounds(244, 235, 147, 21);

cobAuth.addItem("Leader");//添加下拉内容
cobAuth.addItem("Worker");
//cobAuth.setSelectedIndex(0);//设置默认显示下拉框
contentPane.add(cobAuth);

//获取下拉框值
private static String auth1;
auth1 = (String) cobAuth.getSelectedItem();

密码输入框的设置

private static JPasswordField pwdField;

pwdField = new JPasswordField();
pwdField.setBounds(244, 210, 147, 21);
contentPane.add(pwdField);

//获取密码框值
private static String pwd1;
pwd1 = String.v