根据IP获取地域信息

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class IPBean {
	private String ip;

	public void setIp(String ip) {
		this.ip = ip;
	}

	public String getAddrByIP() {
		StringBuffer result = new StringBuffer();
		try {
			URL url = new URL("http://whois.pconline.com.cn/ip.jsp?ip=" + ip);
			HttpURLConnection connect = (HttpURLConnection) url
					.openConnection();
			InputStream is = connect.getInputStream();
			ByteArrayOutputStream outStream = new ByteArrayOutputStream();
			byte[] buff = new byte[256];
			int rc = 0;
			while ((rc = is.read(buff, 0, 256)) > 0) {
				outStream.write(buff, 0, rc);
			}
			byte[] b = outStream.toByteArray();
			// 关闭
			outStream.close();
			is.close();
			connect.disconnect();
			// 因为提供服务的网站使用GB2312编码，所以转化为字符串时也是GB2312，否则是乱码。字符集问题花了整整一天的时间，才解决，原因是对java的String理解不够透彻
			String aa = new String(b, "gb2312");
			result.append(aa);

		} catch (Exception e) {
			e.printStackTrace();
			result = null;
		}
		return result.toString();
	}
}

import java.util.Scanner;

import net.ip.bean.IPBean;

public class IPUtil {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		try {
			String ip = sc.nextLine();
			IPBean bean = new IPBean();
			bean.setIp(ip);
			String result = bean.getAddrByIP();
			System.out.println(result);
		} catch (Exception ex) {
			System.err.println(ex.toString());
		}
	}

}