关于HttpClient请求获取数据

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。