packagecom.lzw;importjava.awt.EventQueue;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjavax.swing.JButton;importjavax.swing.JFrame;importjavax.swing.JLabel;importjavax.swing.JOptionPane;importjavax.swing.JPanel;importjavax.swing.JTextField;importjavax.swing.border.EmptyBorder;public class CheckIPAddress extendsJFrame {privateJPanel contentPane;privateJTextField ipField;
public static voidmain(String[] args) {
EventQueue.invokeLater(newRunnable() {public voidrun() {try{
CheckIPAddress frame= newCheckIPAddress();
frame.setVisible(true);
}catch(Exception e) {
e.printStackTrace();
}
}
});
}
publicCheckIPAddress() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 280, 128);
contentPane= newJPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lblip= new JLabel("\u8BF7\u8F93\u5165IP\u5730\u5740\uFF1A");
lblip.setBounds(12, 14, 92, 15);
contentPane.add(lblip);
ipField= newJTextField();
ipField.setBounds(100, 10, 141, 25);
contentPane.add(ipField);
JButton button= new JButton("\u9A8C\u8BC1");
button.addActionListener(newActionListener() {public voidactionPerformed(ActionEvent e) {
do_button_actionPerformed(e);
}
});
button.setBounds(66, 57, 93, 23);
contentPane.add(button);
}protected voiddo_button_actionPerformed(ActionEvent e) {
String text= ipField.getText();//擷取使用者輸入
String info = matches(text);//對輸入文本進行IP驗證
JOptionPane.showMessageDialog(null, info);//用對話框輸出驗證結果
}
publicString matches(String text) {if (text != null && !text.isEmpty()) {//定義正規表達式
String regex = "^(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|[1-9])\\."
+ "(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)\\."
+ "(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)\\."
+ "(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)$";//判斷ip位址是否與正規表達式比對
if(text.matches(regex)) {//傳回判斷資訊
return text + "\n是一個合法的IP位址！";
}else{//傳回判斷資訊
return text + "\n不是一個合法的IP位址！";
}
}//傳回判斷資訊
return "請輸入要驗證的IP位址！";
}
}