ip_dn.java

主要是对于JAVA的编程的基本语言 希望能够帮得上你。

package net;

import java.awt.HeadlessException;
import java.net.*;

import javax.swing.*;

public class IP_DN {

	public static void main(String[] args) {

		String strIP = JOptionPane.showInputDialog(null, "输入IP地址：", "网络",
				JOptionPane.INFORMATION_MESSAGE);

		try {
			if (strIP.equals(null))
				return;
			else {
				String strIPAddress = strIP;
				byte[] ipAddress = new byte[4];
				// 将IP地址字符串转换成相应的字节数组
				for (int i = 0; i < 3; i++) {
					ipAddress[i] = Byte.parseByte(strIP.substring(0, strIP
							.indexOf('.')));
					strIP = strIP.substring(strIP.indexOf('.') + 1);
				}
				ipAddress[3] = Byte.parseByte(strIP);
				InetAddress host = InetAddress.getByAddress(ipAddress);
				String hostName = host.getHostName();
				JOptionPane.showMessageDialog(null, "主机名：" + hostName + "\n"
						+ "IP地址：" + strIPAddress, "IP-->DN",
						JOptionPane.INFORMATION_MESSAGE);

			}
		} catch (NumberFormatException e) {			
			e.printStackTrace();
		} catch (HeadlessException e) {			
			e.printStackTrace();
		} catch (UnknownHostException e) {			
			e.printStackTrace();
		}
	}
}