java根据ip地质调用百度定位api服务获取地理位置示例

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=OGNLmlzGl46KE7HU0hblDk2zXPPv0w5v&ip=58.250.63.74");
        System.out.println(json.toString());
        System.out.println(((JSONObject)((JSONObject) json.get("content")).get("address_detail")).get("city"));
    }
}