Java窗体构建学习（3）

//上传图片的方法
Toolkit toolkit=Toolkit.getDefaultToolkit(); // 获取Toolkit对象
Image icon = toolkit.getImage(“titleIcon.jpg”); // 获取图片对象
this.setIconImage(icon); // 设置图标


//获取本地图片，使用绝对路径
Image icon = getDefaultToolkit().getImage(“C:\Users\CD4356\Pictures\Saved Pictures\titleIcon.jpg”);


//获取项目中img文件夹里的图片
Image icon = getDefaultToolkit().getImage(“img/titleIcon.jpg”);


//获取项目根目录中的图片
Image icon = getDefaultToolkit().getImage(“titleIcon.jpg”);

package denglujiemian;
import javax.swing.*;


import java.awt.*
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;




public class LoginView extends JFrame {
  JLabel nameLabel = new JLabel("登陆界面",JLabel.CENTER);
  SpringLayout springLayout= new SpringLayout();
  JPanel centerPanel =new JPanel(springLayout);
  JLabel userNameLabel=new JLabel("用户名：");
  JTextField userTxt=new JTextField();
  JLabel pwdLabel=new JLabel("密码：");
  JPasswordField pwdField= new JPasswordField();
  JButton loginBtn= new JButton("登录");
  JButton resetBtn=new JButton("重置");
  
  SystemTray systemTray;
  TrayIcon trayIcon;
  
  
  
  public LoginView() {
    super("Java学生管理");
    Container contentPane =getContentPane();
    
    
    nameLabel.setFont(new Font("华文行楷",Font.PLAIN,40));
    nameLabel.setPreferredSize(new Dimension (0,80));
    
    Font centerFont= new Font("楷体",Font.PLAIN,20);
    userNameLabel.setFont(centerFont);
    userTxt.setPreferredSize(new Dimension(200,30));
    pwdLabel.setFont(centerFont);
    pwdField.setPreferredSize(new Dimension (200,30));
    loginBtn.setFont(centerFont);
    resetBtn.setFont(centerFont);
    //把组件加入面板
    centerPanel.add(userNameLabel);
    centerPanel.add(userTxt);
    centerPanel.add(pwdLabel);
    centerPanel.add(pwdField);
    centerPanel.add(loginBtn);
    centerPanel.add(resetBtn);
    
    //弹簧布局
    //布局userNameLabel
    Spring childWidth=Spring.sum(Spring.sum(Spring.width(userNameLabel), Spring.width(userTxt)),Spring.constant(20));
    int offsetX=childWidth.getValue()/2;
    springLayout.putConstraint(SpringLayout.WEST, userNameLabel, -offsetX, SpringLayout.HORIZONTAL_CENTER, centerPanel);
    springLayout.putConstraint(SpringLayout.NORTH, userNameLabel, 20, SpringLayout.NORTH, centerPanel);
    //userTxt
    springLayout.putConstraint(SpringLayout.WEST, userTxt, 20, SpringLayout.EAST, userNameLabel);
    springLayout.putConstraint(SpringLayout.NORTH, userTxt, 0, SpringLayout.NORTH, userNameLabel);
    //pwdLabel
    springLayout.putConstraint(SpringLayout.EAST, pwdLabel, 0, SpringLayout.EAST, userNameLabel);
    springLayout.putConstraint(SpringLayout.NORTH, pwdLabel, 20, SpringLayout.SOUTH,userNameLabel);
    //pwdField
    springLayout.putConstraint(SpringLayout.WEST,pwdField, 20, SpringLayout.EAST, pwdLabel);
    springLayout.putConstraint(SpringLayout.NORTH, pwdField, 0, SpringLayout.NORTH, pwdLabel);
    //LoginBtn
    springLayout.putConstraint(SpringLayout.WEST, loginBtn, 50, SpringLayout.WEST, pwdLabel);
    springLayout.putConstraint(SpringLayout.NORTH, loginBtn, 20, SpringLayout.SOUTH, pwdLabel);
    //resetBtn
    springLayout.putConstraint(SpringLayout.WEST, resetBtn, 90, SpringLayout.EAST, loginBtn);
    springLayout.putConstraint(SpringLayout.NORTH, resetBtn, 0, SpringLayout.NORTH,loginBtn);
    
    contentPane.add(nameLabel,BorderLayout.NORTH);
    contentPane.add(centerPanel,BorderLayout.CENTER);
    
    if(SystemTray.isSupported()) {
      systemTray=SystemTray.getSystemTray();
      Toolkit toolkit=Toolkit.getDefaultToolkit();
      Image icon = toolkit.getDefaultToolkit().getImage("F:\\素材\\Taki-11.14-星河尽明意 万般皆是你素材包\\宇航员.png");
      trayIcon=new TrayIcon(new ImageIcon(icon).getImage());
      //设置托盘图标自动缩放
      trayIcon.setImageAutoSize(true);
      
      try{systemTray.add(trayIcon);
    }catch(AWTException e) {
      e.printStackTrace();
    }
      //增加最小化时销毁资源
      this.addWindowListener(new WindowAdapter() {
        @Override
        public void windowIconified(WindowEvent e) {
          LoginView.this.dispose();
        }
      });
      trayIcon.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseClicked(MouseEvent e) {
          int clickCount=e.getClickCount();
          if(clickCount==1) {
            LoginView.this.setExtendedState(JFrame.NORMAL);
          }
          LoginView.this.setVisible(true);
        }
      
      
      
      });
        
      }
    
    Toolkit toolkit=Toolkit.getDefaultToolkit();
    Image icon = toolkit.getDefaultToolkit().getImage("F:\\\\素材\\\\Taki-11.14-星河尽明意 万般皆是你素材包\\\\猫.png");
    setIconImage(icon);
    setSize(600,400);//大小
    setLocationRelativeTo(null);//居中
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭退出程序
    setVisible(true);
    
  }
  public static void main(String[] args) {
    new LoginView();
  }
  
  


}