可现实开机最小化托盘,可还原;并可设置定时关机。

1、MainFrame

package pretoct;
import java.awt.AWTException;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.MenuItem;
import java.awt.Panel;
import java.awt.PopupMenu;
import java.awt.SystemTray;
import java.awt.TextArea;
import java.awt.TrayIcon;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.text.SimpleDateFormat;
import java.util.Date;
  
  
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.Timer;

import pretoct.SD;
  
 public class MainFrame extends JFrame {
 static TextArea ta = new TextArea();
 private static TrayIcon trayIcon = null;
 static JFrame mf = new JFrame();
 static SystemTray tray = SystemTray.getSystemTray();
 
 public static void myFrame() { // 窗体
  mf.setLocation(300, 100);
  mf.setSize(400, 150);
  mf.setTitle("定时休息系统");
  mf.setLayout(new BorderLayout());
 
  ta.setText("30");
 
  ImageIcon ll = new ImageIcon("image/favicon.ico");//在JFrame中使用图片
  JLabel i = new JLabel(ll);
  
  JLabel j = new JLabel("鼠标单击设置定时关机", SwingConstants.CENTER);//设置标签,显示文本居中
  j.addMouseListener(new MouseAdapter(){
      public void mouseClicked(MouseEvent e){
        j.setForeground(Color.red);
        System.out.println("-------------");
        SD win= new SD("定时关机程序");
        Thread t=new Thread(win);
        t.start(); 
      }//mouseClicked
    });//addMouseListener
  JLabel k = new JLabel("实现定时休息提醒功能,在下框中输入休息间隔时间(分)。", SwingConstants.CENTER);//设置标签,显示文本居中
  j.setFont(new java.awt.Font("", 1, 18));//设置标签J显示字体
  
  Panel p1 = new Panel();//实例化面板P1
  p1.setLayout(new BorderLayout());//设置面板P1中控件排列方式
  
  final Panel p11 = new Panel();
  p11.setLayout(new BorderLayout());//设置P11控件排列方式
  p11.add(j, BorderLayout.NORTH);//P11上方显示控件J

  p11.add(k, BorderLayout.SOUTH);//P11下方显示控件K
    
  final JLabel t = new JLabel("",SwingConstants.CENTER);//设置标签t用于显示时钟

  t.setFont(new java.awt.Font("", 1, 26));//设置标签t字体
  t.setForeground(Color.blue);//设置标签t前景色彩
  
  p11.add(t,BorderLayout.CENTER);//标签t显示在中间位置
 
      
  Timer timer_date = new Timer(1000,new ActionListener(){ //设置数字时钟
      public void actionPerformed(ActionEvent evt) {
       t.setText( new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss").format(new Date()));
      }//actionPerformed
     }); //Timer
  timer_date.start();
  
  p1.add(i, BorderLayout.WEST);//左侧图标
  p1.add(p11, BorderLayout.CENTER);//p11在P1中间排列
  
  mf.add(p1, BorderLayout.NORTH);//将p1显示在窗口上方
  mf.add(ta, BorderLayout.CENTER);//将一个多行文本区域显示在文体中间
 
  mf.setVisible(true);//使窗口可见
  
  mf.addWindowListener(new WindowAdapter() { // 窗口关闭事件
     public void windowClosing(WindowEvent e) {
      System.exit(0);
     };//windowClosing
  
     public void windowIconified(WindowEvent e) { // 窗口最小化事件
    	 mf.setVisible(false);
    	 MainFrame.miniTray();
     }//windowIconified
    });//addWindowListener
  MainFrame.setTimer();
  //add 使最小化
  MainFrame.miniTray();
  mf.setVisible(false);
  //end add
  }//myFrame
  private static void miniTray() {  //窗口最小化到任务栏托盘
  ImageIcon trayImg = new ImageIcon("image/favicon.ico");//托盘图标
   PopupMenu pop = new PopupMenu();  //增加托盘右击菜单
  MenuItem show = new MenuItem("还原");
  MenuItem exit = new MenuItem("退出");
  
  show.addActionListener(new ActionListener() {
  
   public void actionPerformed(ActionEvent e) { // 按下还原键
  
    tray.remove(trayIcon);
    mf.setVisible(true);
    mf.setExtendedState(JFrame.NORMAL);
    mf.toFront();
   }//actionPerformed
  
  });//addActionListener
  
  exit.addActionListener(new ActionListener() { // 按下退出键
     public void actionPerformed(ActionEvent e) {
      tray.remove(trayIcon);
      System.exit(0);
  
     }//actionPerformed
  
    });//addActionListener
  
  pop.add(show);
  pop.add(exit);
  
  trayIcon = new TrayIcon(trayImg.getImage(), "请注意休息哦!身体最重要。", pop);
  trayIcon.setImageAutoSize(true);
  
  trayIcon.addMouseListener(new MouseAdapter() {
  
   public void mouseClicked(MouseEvent e) { // 鼠标器双击事件
    if (e.getClickCount() == 2){
     tray.remove(trayIcon); // 移去托盘图标
     mf.setVisible(true);
     mf.setExtendedState(JFrame.NORMAL); // 还原窗口
     mf.toFront();
    }//if
  
   }//mouseClicked
  
  });//addMouseListener
  
  try {
   tray.add(trayIcon);
  } catch (AWTException e1) {
   // TODO Auto-generated catch block
   e1.printStackTrace();
  }//try
 }//miniTray
 //设置Timer 
 private static void setTimer(){   
int time=1000;      //1000ms实现一次动作 实际是一个线程  
long openTime=System.currentTimeMillis()/1000;//起初值
     Timer timeAction = new Timer(time, new ActionListener() {          
          
         public void actionPerformed(ActionEvent e) {
             int userRestMinute=Integer.parseInt(ta.getText())*60;
             long nowTime=System.currentTimeMillis()/1000;
             long cha=nowTime-openTime;
             long bi=cha%userRestMinute;
 
             if(bi==0){
                new TopFrame();   //打开新界面
                System.out.println("hava a reset");
            }//if
         }//actionPer
     });            
 
     timeAction.start();
 }//setTimer
 
 public static void main(String[] args) {
  new MainFrame();
  MainFrame.myFrame();
  
 }//main
}//MainFrame

2、TopFrame.java

package pretoct;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JRootPane;
import javax.swing.JTextField;
import javax.swing.Timer;  

public class TopFrame extends Frame{
	JTextField jtf=null;
	int rest=100;//minutes
	public TopFrame(){
	JFrame frame =new JFrame();
	
	FlowLayout  flow=new FlowLayout( );

	frame.setLayout(flow);	

	JLabel jlb=new JLabel("现在是休息时间,请好好休息!");
	jtf=new JTextField(5);
	frame.add(jlb);
	frame.add(jtf);
	jtf.setText(rest+"");
	jtf.disable();


	frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
	frame.setAlwaysOnTop(true);
	frame.setUndecorated(true); // 去掉窗口的装饰 
	frame.getRootPane().setWindowDecorationStyle(JRootPane.NONE);//采用指定的窗口装饰风格 
	frame.setVisible(true);
	
	
	Timer timeAction = new Timer(1000, new ActionListener() {          
   	 
        public void actionPerformed(ActionEvent e) {
        	rest--;
        	jtf.setText(rest+"");
        	if(jtf.getText().equals("0")){
	       		System.out.println("-finished-");
	       		frame.dispose();
        	}//if
        }//actionPerformed
    });//timeAction         

    timeAction.start();
}//TopFrame
}//TopFrame

3、FrameSD

package pretoct;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.text.SimpleDateFormat;
import java.io.*;
class SD extends Frame implements ActionListener,Runnable{
Label text1;
  TextField text2;
  Label text3;
  Label text4;
  Button button1 ;
  Button button2 ;
  Dialog dlg;
  Date nowtime;
  String st;
  boolean tf=false;
  SD(String s)
  {super(s);
   setLayout(new GridLayout(4,2));
   text1=new Label("请输入关机时间(如 06:20): ",text1.CENTER);
   text2=new TextField(10);
   text3=new Label("现在的时间是:",text3.CENTER);
   nowtime=new Date();
   SimpleDateFormat matter1=new SimpleDateFormat("HH 时 mm 分 ss秒 yyyy年 MM 月DD 日 E");
   text4=new Label(matter1.format(nowtime));
   button1=new Button("确定");
   button2=new Button("取消");
 
   add(text1);
   add(text2);
   add(text3);
   add(text4);
   add(button1);
   add(button2);
   setBounds(100,100,500,150);
   button1.addActionListener(this);
   button2.addActionListener(this);
   
   addWindowListener(new WindowAdapter(){
    public void windowClosing(WindowEvent e){System.exit(0);}
    });
   setVisible(true);
   validate();
 
  }
public void run(){
  while(true){
  nowtime=new Date();
   SimpleDateFormat matter2=new SimpleDateFormat("HH 时 mm 分 ss秒 yyyy年 MM 月DD 日 E");
   text4.setText((matter2.format(nowtime)));
   try{
   Thread.sleep(1000);}
   catch(Exception ex){}
  }}
public void actionPerformed(ActionEvent e) {
   String command=e.getActionCommand();
   if(command.equals("确定")){
       st=text2.getText();
       int tj=st.length();
       if(st.equals("")||tj<5){
      
        final Dialog d=new Dialog(this,"错误",true);
        d.add(new Label("你输入的格式错误!请从新输入!例如08:30",Label.CENTER));
        d.addWindowListener(new WindowAdapter(){
         public void windowClosing(WindowEvent e){d.dispose();}
         });
        d.setSize(300,100);
        d.setVisible(true);
       }else{
     
       dlg=new Dialog(this,"关机确定",true);
       Panel p=new Panel();
       p.setLayout(new GridLayout(1,2));
       Button button3=new Button("是");
       Button button4=new Button("否");
       p.add(button3);
       p.add(button4);
       button3.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent s){
           try{
           Runtime rt=Runtime.getRuntime();
          String   cmd= " C:/Windows/System32/at "+st+" shutdown.exe -s -t 20";         
            rt.exec(cmd);}catch(IOException e){}
         dlg.dispose();}
          });
       button4.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent s){
    
          dlg.dispose();}
           });
           dlg.addWindowListener(new WindowAdapter()
         {
         public void windowClosing(WindowEvent e){dlg.dispose();}
         });
        dlg.add(new Label("你确定在"+st+"时关机?在cmd中使用at id /delete可放弃任务。"),"Center");
        dlg.add(p,"South");
        dlg.setBounds(150,200,200,100);
        dlg.setVisible(true);
        }}
          else if(command.equals("取消")){
         this.dispose();
        }
}
}
/*
public class FrameSD{
 public static void main(String arge[]){
  SD win= new SD("定时关机程序");
 Thread t=new Thread(win);
 t.start();   
}//main
}//FrameSD*/