Timer Swing

http://blog.csdn.net/HideLin/article/details/8201267
import java.awt.*;
import java.awt.event.*;
import java.io.IOException;
import java.util.Calendar;
import javax.swing.*;

public class CloseComputer extends JFrame implements ActionListener{
    //创建成员变量
    //创建实现BorderLayout布局的面板对象panelmain,用于放panelSubnorth面板和panelSubcenter面板
    private JPanel panelMain;
    //创建实现FlowLayout布局的面板对象panelSubnorth,用于放tag提示标签
    private JPanel panelSubnorth;
    //创建实现FlowLayout布局的面板对象panelSubcenter,用于放3个按钮
    private JPanel panelSubcenter;

    //创建三个按钮
    private Button countdown;
    private Button time;
    private Button cancel;
    private String key;
    //创建一个提示标签
    private JLabel tag;

    public CloseComputer(){
        initComponents();
    }

    /**
     * 初始化组件信息
     */
    public void initComponents() {

        panelMain=new JPanel(new BorderLayout(5, 10));

        panelSubnorth=new JPanel(new FlowLayout(3));
        panelSubcenter=new JPanel(new FlowLayout(1,5,5));

        countdown=new Button("倒计时关机");
        time=new Button("定时关机");
        cancel=new Button("取消关机");

        tag=new JLabel("请选择关机方式");

        //将panelMain添加到窗体中
        this.getContentPane().add(panelMain);
        //添加对象panelSubnorth到对象panelMain窗口里
        panelMain.add(panelSubnorth, BorderLayout.NORTH);
        //添加对象panelSubcenter到对象panelMain窗口里
        panelMain.add(panelSubcenter, BorderLayout.CENTER);

        //添加标签对象tag到对象panelSubnorth窗口里
        panelSubnorth.add(tag);

        //添加3个按钮到对象panelSubcenter里
        panelSubcenter.add(countdown);
        panelSubcenter.add(time);
        panelSubcenter.add(cancel);

        //为3个按钮注册事件监听器
        countdown.addActionListener(this);
        time.addActionListener(this);
        cancel.addActionListener(this);

        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setResizable(false);
        this.setLocation(350, 350);
        this.setSize(400, 400);
        this.setTitle("关机工具");

        this.pack();
    }

    /**
     * 倒计时关机
     */
    public void countdown() {
        //创建字符串面板对象
        key=JOptionPane.showInputDialog(this,"请输入倒计时关机剩余的时间(秒)","输入框",1);
        try {
            Runtime.getRuntime().exec("shutdown -s -t "+key);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    /**
     * 定时关机
     */
    public void time(){
        //获取当前系统的时间
        Calendar calendar=Calendar.getInstance();
        int h=calendar.get(Calendar.HOUR);        //获取小时
        System.out.println(h);
        int m=calendar.get(Calendar.MINUTE);    //获取分钟
        int s=calendar.get(Calendar.SECOND);    //获取秒
        String hourtmp,minutetmp,secordtmp;        //保存输入的时间
        int hour,minute,secord;                    //保存转换后的时间
        //输入时间
        hourtmp=JOptionPane.showInputDialog(this,"请输入关机的小时(12小时制)","输入",1);
        minutetmp=JOptionPane.showInputDialog(this,"请输入关机的分钟","输入",1);
        secordtmp=JOptionPane.showInputDialog(this,"请输入关机的秒钟","输入",1);
        //转换时间
        hour=Integer.parseInt(hourtmp);
        minute=Integer.parseInt(minutetmp);
        secord=Integer.parseInt(secordtmp);

        long setTime=timeSum(hour, minute, secord);    //计算输入时间的总和
        long currentlyTime=timeSum(h, m, s);        //计算当前系统时间的总和
        long discrepancyTime=setTime-currentlyTime;    //获取时间差
        if (discrepancyTime<0) {
            try {
                Runtime.getRuntime().exec("shutdown -s");
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }else {
            try {
                Runtime.getRuntime().exec("shutdown -s  -t "+discrepancyTime);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            JOptionPane.showMessageDialog(this, "恭喜你,设置成功!", "确认", 2);
        }
    }
    /**
     * 计算出时间总和,并返回
     * @param h
     * @param m
     * @param s
     * @return
     */
    public int timeSum(int h,int m,int s) {
        int sum=h*3600+m*60+s;
        return sum;
    }

    /**
     * 取消关机
     */
    public void cancel() {
        JOptionPane.showMessageDialog(this, "你已经成功取消了关机操作!", "消息", 2);
        try {
            Runtime.getRuntime().exec("shutdown -a");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                new CloseComputer().setVisible(true);
            }
        });

    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub
        if (e.getSource() == countdown) {
            countdown();
        }
        if (e.getSource() == time) {
            time();
        }
        if (e.getSource() == cancel) {
            cancel();
        }
    }
}