java 动态获取IP地址(城市)

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;
/**
 * 根据IP地址获取详细的地域信息
 *
 * @project:personGocheck
 * @class:AddressUtils.java
 * @author:heguanhua E-mail:[e-mail]
 * @date：Nov 14, 2012 6:38:25 PM
 */
public class Ip { 
 /**
     *
     * @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
     * @throws UnsupportedEncodingException
     */
 public String getAddresses(String content, String encodingString)
   throws UnsupportedEncodingException {
  // 这里调用pconline的接口
  String urlStr = "http://ip.taobao.com/service/getIpInfo.php";
  //其中code的值的含义为，0：成功，1：失败。
  //（json格式的）国家 、省（自治区或直辖市）、市（县）、运营商
  //根据不同的单词选择对应的信息
  String returnStr = this.getResult(urlStr, content, encodingString);
  if (returnStr != null) {
   // 处理返回的省市区信息
   //System.out.println(returnStr);
   String[] temp = returnStr.split(",");
   //System.out.println(temp[5]);
   if(temp.length<3){
    return "0";// 无效IP，局域网测试
   }
   //省
   String region = (temp[5].split(":"))[1].replaceAll("\"", "");
   region = decodeUnicode(region);// 省份
   String city = (temp[7].split(":"))[1].replaceAll("\"", "");
   System.out.println(decodeUnicode(city)+"....");
   return region;
  }
  return null;
 }
 /**
     * @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;
 }
 /**
     * unicode 转换成 中文
     *
     * @author fanhui 2007-3-15
     * @param theString
     * @return
     */
 public static String decodeUnicode(String theString) {
  char aChar;
  int len = theString.length();
  StringBuffer outBuffer = new StringBuffer(len);
  for (int x = 0; x < len;) {
   aChar = theString.charAt(x++);
   if (aChar == '\\') {
    aChar = theString.charAt(x++);
    if (aChar == 'u') {
     int value = 0;
     for (int i = 0; i < 4; i++) {
      aChar = theString.charAt(x++);
      switch (aChar) {
      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
       value = (value << 4) + aChar - '0';
       break;
      case 'a':
      case 'b':
      case 'c':
      case 'd':
      case 'e':
      case 'f':
       value = (value << 4) + 10 + aChar - 'a';
       break;
      case 'A':
      case 'B':
      case 'C':
      case 'D':
      case 'E':
      case 'F':
       value = (value << 4) + 10 + aChar - 'A';
       break;
      default:
       throw new IllegalArgumentException(
         "Malformed      encoding.");
      }
     }
     outBuffer.append((char) value);
    } else {
     if (aChar == 't') {
      aChar = '\t';
     } else if (aChar == 'r') {
      aChar = '\r';
     } else if (aChar == 'n') {
      aChar = '\n';
     } else if (aChar == 'f') {
      aChar = '\f';
     }
     outBuffer.append(aChar);
    }
   } else {
    outBuffer.append(aChar);
   }
  }
  return outBuffer.toString();
 }
 // 测试
 public static void main(String[] args) {
  Ip addressUtils = new Ip();
  String ip = "0:0:0:0:0:0:0:1";
  String address = "";
  try {
   address = addressUtils.getAddresses("ip="+ip, "utf-8");
  } catch (UnsupportedEncodingException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  System.out.println(address);
 }
}