java读取其他服务接口返回的json数据示例代码

/** 
 * 
 *<p>类描述：接口读取工具。</p> 
 */ 
public class ReadUrlUtil { 
  public static JSONObject readJsonFromUrl(String url) throws IOException, JSONException { 
  InputStream is = new URL(url).openStream(); 
  try { 
   BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8"))); 
   StringBuilder sb = new StringBuilder(); 
   int cp; 
   while ((cp = rd.read()) != -1) { 
   sb.append((char) cp); 
   } 
   String jsonText = sb.toString(); 
   JSONObject json = JSONObject.fromObject(jsonText); 
   return json; 
  } finally { 
   is.close(); 
  } 
  } 
} 

public static void main(String[] args) throws IOException, JSONException { 
/   这里调用百度的ip定位api服务 详见 http://api.map.baidu.com/lbsapi/cloud/ip-location-api.htm 
  String ip = "113.57.244.100"; 
  String url = "http://api.map.baidu.com/location/ip?ak=32f38c9491f2da9eb61106aaab1e9739&ip="+ip+"&coor=bd09ll";  
  JSONObject json = ReadUrlUtil.readJsonFromUrl(url); 
  System.out.println(json.toString()); 
  System.out.println("经度："+((JSONObject) json.get("content")).getJSONObject("point").get("x")); 
  System.out.println("维度："+((JSONObject) json.get("content")).getJSONObject("point").get("y")); 
  String city =(String) ((JSONObject) json.get("content")).getJSONObject("address_detail").get("city"); 
  city = city.replace("市",""); 
  System.out.println(city);  
  }