通过IP地址获得域名和主机名

package com.zzk; import java.awt.Color; import java.awt.EventQueue; import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.net.InetAddress; import java.net.UnknownHostException; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; @SuppressWarnings("serial") public class ByIpGainDomainFrame extends JFrame { private JTextField tf_ip; private JTextField tf_canonical; private JTextField tf_host; /** * Launch the application * * @param args */ public static void main(String args[]) { EventQueue.invokeLater(new Runnable() { public void run() { try { ByIpGainDomainFrame frame = new ByIpGainDomainFrame(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame */ public ByIpGainDomainFrame() { super(); getContentPane().setLayout(null); setTitle("通过IP地址获得域名和主机名"); setBounds(100, 100, 333, 218); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); final JButton button = new JButton(); button.addActionListener(new ActionListener() { public void actionPerformed(final ActionEvent e) { try { String ip = tf_ip.getText();// IP地址 String[] ipStr = ip.split("[.]");// IP转换为字符串数组 byte[] ipBytes = new byte[4];// 声明存储转换后IP的字节数组 for (int i = 0; i < 4; i++) { int m = Integer.parseInt(ipStr[i]);// 转换为整数 byte b = (byte) (m & 0xff);// 转换为字节 ipBytes[i] = b;// 赋值给字节数组 } InetAddress inetAddr = InetAddress.getByAddress(ipBytes);// 创建InetAddress对象 String canonical = inetAddr.getCanonicalHostName();// 获取域名 String host = inetAddr.getHostName();// 获取主机名 tf_canonical.setText(canonical);// 在文本框中显示域名 tf_host.setText(host);// 在文本框中显示主机名 } catch (UnknownHostException e1) { e1.printStackTrace(); } } }); button.setText("获取域名和主机名"); button.setBounds(28, 136, 150, 28); getContentPane().add(button); final JLabel label = new JLabel(); label.setForeground(new Color(0, 0, 255)); label.setFont(new Font("", Font.BOLD, 16)); label.setText("通过IP地址获得域名和主机名"); label.setBounds(51, 10, 223, 35); getContentPane().add(label); final JLabel label_1 = new JLabel(); label_1.setText("主 机 名："); label_1.setBounds(28, 110, 66, 18); getContentPane().add(label_1); tf_host = new JTextField(); tf_host.setBounds(87, 108, 199, 22); getContentPane().add(tf_host); final JButton button_1 = new JButton(); button_1.addActionListener(new ActionListener() { public void actionPerformed(final ActionEvent e) { System.exit(0); } }); button_1.setText("退出系统"); button_1.setBounds(191, 136, 95, 28); getContentPane().add(button_1); final JLabel label_2 = new JLabel(); label_2.setText("域 名："); label_2.setBounds(28, 82, 66, 18); getContentPane().add(label_2); tf_canonical = new JTextField(); tf_canonical.setBounds(87, 80, 199, 22); getContentPane().add(tf_canonical); final JLabel label_3 = new JLabel(); label_3.setText("输入IP地址："); label_3.setBounds(10, 51, 84, 18); getContentPane().add(label_3); tf_ip = new JTextField(); tf_ip.setBounds(87, 52, 199, 22); getContentPane().add(tf_ip); // } }