object ringbuf from rgs buffere while except pro open

package com.ust.map;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import net.sf.json.JSONObject;
public class getAddressByIP{
public String getAddressByIP(){
try
{
String strIP = "60.15.28.2";
URL url = new URL( "http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip=" + strIP);

URLConnection conn = url.openConnection();
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "GBK"));
String line = null;
StringBuffer result = new StringBuffer();

while((line = reader.readLine()) != null)
{ 
  result.append(line); 
} 
reader.close(); 
 

// System.out.println(result);
JSONObject json = JSONObject.fromObject(result.toString());
// System.out.println(json);
String country=(String) json.get("country");
String province=(String) json.get("province");
String city=(String) json.get("city");
return country+province+city;

}
catch( IOException e)
{
return "讀取失敗";
}
}
public static void main(String[] args) {
getAddressByIP getAddressByIP=new getAddressByIP();
System.out.println(getAddressByIP.getAddressByIP());
}
}

Java根據IP獲取國家省級地市信息