依据IP获取 地址信息

package com.lee;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;

import org.json.JSONException;
import org.json.JSONObject;
/**
 * 根据IP地址获取详细的地域信息
 */
public class IPSeeker {  
 public void getAddresses(String content, String encodingString)
   throws UnsupportedEncodingException {
  //这里调用pconline的接口
  String urlStr = "http://ip.taobao.com/service/getIpInfo.php";
  //从http://whois.pconline.com.cn取得IP所在的省市区信息
  String returnStr = this.getResult(urlStr, content, encodingString);
  if (returnStr != null) {
	 System.out.println(returnStr);
	 JSONObject json=null;
	try {
		json = new JSONObject(returnStr);
		System.out.println(json.optJSONObject("data").getString("country"));
		System.out.println(json.optJSONObject("data").getString("area"));
		System.out.println(json.optJSONObject("data").getString("region"));
		System.out.println(json.optJSONObject("data").getString("city"));
		System.out.println(json.optJSONObject("data").getString("county"));
		System.out.println(json.optJSONObject("data").getString("isp"));
	} catch (JSONException e){
		e.printStackTrace();
	} 
  }
 }
 /**
  * @param urlStr
  *            请求的地址
  * @param content
  *            请求的参数 格式为：name=xxx&pwd=xxx
  * @param encoding
  *            服务器端请求编码。如GBK,UTF-8等
  * @return
  */
 private String getResult(String urlStr, String content, String encoding) {
  URL url = null;
  HttpURLConnection connection = null;
  try {
   url = new URL(urlStr);
   connection = (HttpURLConnection) url.openConnection();// 新建连接实例
   connection.setConnectTimeout(2000);// 设置连接超时时间，单位毫秒
   connection.setReadTimeout(2000);// 设置读取数据超时时间，单位毫秒
   connection.setDoOutput(true);// 是否打开输出流 true|false
   connection.setDoInput(true);// 是否打开输入流true|false
   connection.setRequestMethod("POST");// 提交方法POST|GET
   connection.setUseCaches(false);// 是否缓存true|false
   connection.connect();// 打开连接端口
   DataOutputStream out = new DataOutputStream(connection.getOutputStream());// 打开输出流往对端服务器写数据
   out.writeBytes(content);// 写数据,也就是提交你的表单 name=xxx&pwd=xxx
   out.flush();// 刷新
   out.close();// 关闭输出流
   BufferedReader reader = new BufferedReader(new InputStreamReader(
     connection.getInputStream(), encoding));// 往对端写完数据对端服务器返回数据
   // ,以BufferedReader流来读取
   StringBuffer buffer = new StringBuffer();
   String line = "";
   while ((line = reader.readLine()) != null) {
	   buffer.append(line);
   }
   	reader.close();
   return buffer.toString();
  } catch (IOException e) {
	  e.printStackTrace();
  } finally {
   if(connection != null) {
	   connection.disconnect();// 关闭连接
   }
  }
  return null;
 }
 
 // 测试
 public static void main(String[] args) throws UnsupportedEncodingException {
  IPSeeker seeker = new IPSeeker();
  //测试ip 219.136.134.157 中国=华南=广东省=广州市=越秀区=电信
  String ip = "219.136.134.157";
  try {
	  seeker.getAddresses("ip="+ip, "GBK");
  }catch (UnsupportedEncodingException e) {
    e.printStackTrace();
  }
 }
}