package test; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.Reader; import java.net.URL; import java.nio.charset.Charset; import org.json.JSONException; import org.json.JSONObject; /**  * java根据url获取json对象  * @author openks  * @since 2013-7-16  * 需要添加java-json.jar才能运行  */ public class GetPlaceByIp {   private static String readAll(Reader rd) throws IOException {     StringBuilder sb = new StringBuilder();     int cp;     while ((cp = rd.read()) != -1) {       sb.append((char) cp);     }     return sb.toString();   }   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")));       String jsonText = readAll(rd);       JSONObject json = new JSONObject(jsonText);       return json;     } finally {       is.close();      // System.out.println("同时 从这里也能看出 即便return了，仍然会执行finally的！");     }   }   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     JSONObject json = readJsonFromUrl("http://api.map.baidu.com/location/ip?ak=F454f8a5efe5e577997931cc01de3974&ip=202.198.16.3");     System.out.println(json.toString());     System.out.println(((JSONObject) json.get("content")).get("address"));   } }