執行結果：

中國電信

西雙版納

西雙版納,中國電信

程式碼：

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class NewMobile {
	
	public static void main(String[] args) {
		
		System.out.println(NewMobile.getCarrier("18988176532"));
		System.out.println(NewMobile.getCity("18988176532"));
		System.out.println(NewMobile.getResult("18988176532"));
	}
	
	//得到歸屬地
	public static String getCity(String tel) {
		try{
			//獲取返回結果
			String json = httpRequest(tel).toString();
			//拆分xml頁面程式碼
			String[] a = json.split("att");
			String[] b = a[1].split(",");
			//歸屬地
			String city = b[2].replace(">", "").replace("</", "");
			return city;
		}catch(Exception e){
			return "暫無相關歸屬地資訊！";
		}
	}
	
	//得到運營商
	public static String getCarrier(String tel) {
		try{
			//獲取返回結果
			String json = httpRequest(tel).toString();
			//拆分xml頁面程式碼
			String[] a = json.split("att");
			String[] c = a[2].split("operators");
			//運營商
			String carrier = c[1].replace(">", "").replace("</", "");
			return carrier;
		}catch(Exception e){
			return "暫無相關運營商資訊！";
		}
	}
	
	//得歸屬地，運營商。如：西雙版納,中國電信
	public static String getResult(String tel) {
		try{
			//獲取返回結果
			String json = httpRequest(tel).toString();
			//拆分xml頁面程式碼
			String[] a = json.split("att");
			String[] b = a[1].split(",");
			//歸屬地
			String city = b[2].replace(">", "").replace("</", "");
			String[] c = a[2].split("operators");
			//運營商
			String carrier = c[1].replace(">", "").replace("</", "");
			String cityAndCarrier = city+","+carrier;
			return cityAndCarrier;
		}catch(Exception e){
			return "暫無相關歸屬地、運營商資訊！";
		}
	}
	
	/**
	* 發起http請求獲取返回結果
	* @param tel 待查詢手機號
	* @return String 結果字串
	*/
	public static String httpRequest(String tel) {
		
		//組裝查詢地址(requestUrl 請求地址)
		String requestUrl = "http://api.k780.com:88/?app=phone.get&phone="+tel+"&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=xml";

		StringBuffer buffer = new StringBuffer();
		try {
			URL url = new URL(requestUrl);
			HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();
			httpUrlConn.setDoOutput(false);
			httpUrlConn.setDoInput(true);
			httpUrlConn.setUseCaches(false);
			httpUrlConn.setRequestMethod("GET");
			httpUrlConn.connect();
			//將返回的輸入流轉換成字串
			InputStream inputStream = httpUrlConn.getInputStream();
			InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "UTF-8");
			BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
			
			String str = null;
			while ((str = bufferedReader.readLine()) != null) {
				buffer.append(str);
			}
			bufferedReader.close();
			inputStreamReader.close();
			//釋放資源
			inputStream.close();
			inputStream = null;
			httpUrlConn.disconnect();
		}
		catch (Exception e) {
			return "發起http請求後，獲取返回結果失敗！";
		}
		return buffer.toString();
	}
}