java读取接口返回的json数据

package cn.wangshiyu777;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
 
public class JsonUtil {
  public static String loadJson(String url) throws Exception {
    //读取url,返回json串
    StringBuilder json = new StringBuilder();
    URL oracle = new URL(url);
    URLConnection yc = oracle.openConnection();
    BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
    String inputLine = null;
    while((inputLine = in.readLine()) != null){
      json.append(inputLine);
    }
    in.close();
    
    return json.toString();
  }
  public static void main(String[] args) throws Exception {
    String url = "http://api.geonames.org/citiesJSON?north=44.1&south=-9.9&east=-22.4&west=55.2&lang=de&username=demo";
    String json = loadJson(url);
    System.out.println(json);
  }
}