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"));

  }

}