Java编写的定时关机程序!只适用于Windows

import java.awt.Dimension; import java.awt.Image; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Calendar; import javax.swing.JOptionPane; import javax.swing.UIManager; /* * ShutDownPc.java * * Created on __DATE__, __TIME__ */ /** * * @author __USER__ */ public class ShutDownPc extends javax.swing.JFrame { private static final long serialVersionUID = 1L; /** Creates new form ShutDownPc * @throws Exception */ public ShutDownPc() throws Exception { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); initComponents(); Image image=this.getToolkit().getImage("images\\icon.png"); this.setIconImage(image); Dimension screen = this.getToolkit().getScreenSize(); this.setBounds((screen.width - 300) / 2, (screen.height - 200) / 2, 300, 200); Thread thread1 = new Thread(new Runnable() { public void run() { Calendar now = null; SimpleDateFormat sdf = new SimpleDateFormat( "yyyy年MM月dd日HH时mm分ss秒"); while (true) { try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } now = Calendar.getInstance(); String currentTime = sdf.format(now.getTime()); currentTime_lab.setText("当前时间: " + currentTime); } } }); thread1.start(); } /** This method is called from within the constructor to * initialize the form. * WARNING: Do NOT modify this code. The content of this method is * always regenerated by the Form Editor. */ //GEN-BEGIN:initComponents // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { currentTime_lab = new javax.swing.JLabel(); jLabel1 = new javax.swing.JLabel(); timeToShutDownPc_txt = new javax.swing.JTextField(); timeType_combox = new javax.swing.JComboBox(); setTime_btn = new javax.swing.JButton(); cancelToSetTime_btn = new javax.swing.JButton(); timeToShutDown_lab = new javax.swing.JLabel(); jLabel2 = new javax.swing.JLabel(); operationToChoose_combo = new javax.swing.JComboBox(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); setTitle("\u5b9a\u65f6\u5173\u673a"); setResizable(false); currentTime_lab.setText("\u5f53\u524d\u65f6\u95f4:"); jLabel1.setText("\u8bbe\u7f6e\u65f6\u95f4"); timeType_combox.setModel(new javax.swing.DefaultComboBoxModel( new String[] { "秒", "分", "时" })); setTime_btn.setText("\u786e\u5b9a\u8bbe\u7f6e"); setTime_btn.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { setTime_btnActionPerformed(evt); } }); cancelToSetTime_btn.setText("\u53d6\u6d88\u8bbe\u7f6e"); cancelToSetTime_btn .addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { cancelToSetTime_btnActionPerformed(evt); } }); timeToShutDown_lab.setText("\u5173\u673a\u65f6\u95f4:"); jLabel2.setText("\u9009\u62e9\u64cd\u4f5c"); operationToChoose_combo.setModel(new javax.swing.DefaultComboBoxModel( new String[] { "关闭计算机", "重启计算机", "注销计算机" })); javax.swing.GroupLayout layout = new javax.swing.GroupLayout( getContentPane()); getContentPane().setLayout(layout); layout .setHorizontalGroup(layout .createParallelGroup( javax.swing.GroupLayout.Alignment.LEADING) .addGroup( layout .createSequentialGroup() .addGroup( layout .createParallelGroup( javax.swing.GroupLayout.Alignment.LEADING) .addGroup( layout .createSequentialGroup() .addContainerGap() .addComponent( currentTime_lab, javax.swing.GroupLayout.DEFAULT_SIZE, 268, Short.MAX_VALUE)) .addGroup( layout .createSequentialGroup() .addGap( 46, 46, 46) .addGroup( layout .createParallelGroup( javax.swing.GroupLayout.Alignment.TRAILING) .addGroup( layout .createSequentialGroup() .addComponent( setTime_btn) .addGap( 30, 30, 30) .addComponent( cancelToSetTime_btn)) .addGroup( layout .createParallelGroup( javax.swing.GroupLayout.Alignment.LEADING, false) .addGroup( layout .createSequentialGroup() .addComponent( jLabel2) .addPreferredGap( javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent( operationToChoose_combo, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) .addGroup( layout .createSequentialGroup() .addComponent( jLabel1) .addPreferredGap( javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent( timeToShutDownPc_txt, javax.swing.GroupLayout.PREFERRED_SIZE, 75, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap( javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent( timeType_combox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))))) .addGroup( layout .createSequentialGroup() .addContainerGap() .addComponent( timeToShutDown_lab, javax.swing.GroupLayout.DEFAULT_SIZE, 268, Short.MAX_VALUE))) .addContainerGap())); layout .setVerticalGroup(layout .createParallelGroup( javax.swing.GroupLayout.Alignment.LEADING) .addGroup( javax.swing.GroupLayout.Alignment.TRAILING, layout .createSequentialGroup() .addContainerGap() .addGroup( layout .createParallelGroup( javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel1) .addComponent( timeToShutDownPc_txt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent( timeType_combox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.Gr