原理是根据淘宝提供的service查询IP的归属地并且解析http请求返回的json串。
我之前也是伸手党，现在也给伸手党提供下方便。
淘宝返回的数据为：
{"code":0,"data":{"country":"\u4e2d\u56fd","country_id":"CN","area":"\u534e\u4e1c","area_id":"300000","region":"\u5c71\u4e1c\u7701","region_id":"370000","city":"\u4e1c\u8425\u5e02","city_id":"370500","county":"","county_id":"-1","isp":"\u8054\u901a","isp_id":"100026","ip":"60.214.183.158"}}
用法：
String arr1 = GetAddressByIp.GetAddressByIp("120.192.182.1");
System.out.println(arr1);
详细请看代码

 
package getAddressByIp;
  
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
  
import net.sf.json.JSONObject;
  
public class GetAddressByIp
{
      
      
    /**
     * 
     * @param IP
     * @return
     */
    public static String GetAddressByIp(String IP){
        String resout = "";
        try{
         String str = getJsonContent("http://ip.taobao.com/service/getIpInfo.php?ip="+IP);
         System.out.println(str);
           
         JSONObject obj = JSONObject.fromObject(str);
         JSONObject obj2 =  (JSONObject) obj.get("data");
         String code = (String) obj.get("code");
         if(code.equals("0")){
           
             resout =  obj2.get("country")+"--" +obj2.get("area")+"--" +obj2.get("city")+"--" +obj2.get("isp");
         }else{
             resout =  "IP地址有误";
         }
        }catch(Exception e){
              
            e.printStackTrace();
             resout = "获取IP地址异常："+e.getMessage();
        }
        return resout;
           
    }
     
    public static String getJsonContent(String urlStr)
    {
        try
        {// 获取HttpURLConnection连接对象
            URL url = new URL(urlStr);
            HttpURLConnection httpConn = (HttpURLConnection) url
                    .openConnection();
            // 设置连接属性
            httpConn.setConnectTimeout(3000);
            httpConn.setDoInput(true);
            httpConn.setRequestMethod("GET");
            // 获取相应码
            int respCode = httpConn.getResponseCode();
            if (respCode == 200)
            {
                return ConvertStream2Json(httpConn.getInputStream());
            }
        }
        catch (MalformedURLException e)
        {
            e.printStackTrace();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        return "";
    }
  
     
    private static String ConvertStream2Json(InputStream inputStream)
    {
        String jsonStr = "";
        // ByteArrayOutputStream相当于内存输出流
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        // 将输入流转移到内存输出流中
        try
        {
            while ((len = inputStream.read(buffer, 0, buffer.length)) != -1)
            {
                out.write(buffer, 0, len);
            }
            // 将内存流转换为字符串
            jsonStr = new String(out.toByteArray());
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return jsonStr;
    }
}