获取客户IP并查询IP的地理位置（使用淘宝IP地址库）

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;

import javax.servlet.http.HttpServletRequest;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

public class IpUtil {

public static String getIpAddr(HttpServletRequest request) {
String ip = request.getHeader("x-forwarded-for");
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("Proxy-Client-IP");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
if (ip.equals("0:0:0:0:0:0:0:1")) {
ip = "本地";
}
if (ip.split(",").length > 1) {
ip = ip.split(",")[0];
}
return getIpInfo(ip);
}

public static String getIpInfo(String ip) {
String info = "";
try {
URL url = new URL("http://ip.taobao.com/service/getIpInfo.php?ip=" + ip);
HttpURLConnection htpcon = (HttpURLConnection) url.openConnection();
htpcon.setRequestMethod("GET");
htpcon.setDoOutput(true);
htpcon.setDoInput(true);
htpcon.setUseCaches(false);

InputStream in = htpcon.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in));
StringBuffer temp = new StringBuffer();
String line = bufferedReader.readLine();
while (line != null) {
temp.append(line).append("\r\n");
line = bufferedReader.readLine();
}
bufferedReader.close();
JSONObject obj = (JSONObject) JSON.parse(temp.toString());
if (obj.getIntValue("code") == 0) {
JSONObject data = obj.getJSONObject("data");
info += data.getString("country") + " ";
info += data.getString("region") + " ";
info += data.getString("city") + " ";
info += data.getString("isp");
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return info;
}

}