httpClient请求获取网站数据

 今天一网友问我，他写的httpClient请求为什么获取不到数据？他写的代码如下：

StringBuffer buffer = new StringBuffer();
String url1 = "http://api.jisuapi.com/weather/query?appkey=8b650df3d443004f&city=贵阳";
try {
    URL url = new URL(url1);
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    InputStream is = conn.getInputStream();
    Reader reader = new InputStreamReader(is,"utf-8");
    char[] c = new char[1024];
    int count = -1;
    while ((count = reader.read(c)) > 0) {
        buffer.append(c, 0, count);
    }
    reader.close();
    JSONObject obj = JSONObject.parseObject(buffer.toString());
    Weather weather = JSONObject.toJavaObject(obj, Weather.class);
    model.addAttribute("msg",weather);
    System.out.println(weather);
    System.out.println(buffer.toString());
} catch (IOException e) {
    e.printStackTrace();
}

直接通过main方法运行是可以获取到的，但是通过系统页面点击却获取不到。甚是奇怪， 至今我还没搞明白为什么上面的方法不行！希望有知道的大神可以告诉小弟下，感激不尽！！！

后来我给他换了一种方式，如下是我写的代码：

String url = "http://api.jisuapi.com/weather/query?appkey=8b650df3d443004f&city=贵阳";
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpGet get = new HttpGet(url);
try {
    CloseableHttpResponse response = httpClient.execute(get);
    int statusCode =response.getStatusLine().getStatusCode();
    System.out.println(statusCode);
    if(statusCode == 200) {
        HttpEntity entity =response.getEntity();
        String content = EntityUtils.toString(entity,"utf-8");
        System.out.println(content);
        JSONObject obj = JSONObject.parseObject(content);
        Weather weather = JSONObject.toJavaObject(obj, Weather.class);
        model.addAttribute("msg",weather);
    }
    //关闭httpclient
    response.close();
    httpClient.close();
} catch (IOException e) {
    e.printStackTrace();
}

我用的比较多的就是这种，至于为什么上一个会获取不到，还希望知道的大神给予指教。