json连接中央气象台api异常

		//本来准备通过查找城市id后再通过id查找天气信息免去建立数据库的麻烦,但是api不稳定,只能通过建立id数据库来对应查找了

		super.onCreate(savedInstanceState);
		String str = "http://toy.weather.com.cn/SearchBox/searchBox?"
				+ "callback=jsonp1342857491709&_=1342857620727&language=zh&keyword=guilin";

		try {
			URL url = new URL(str);
			HttpURLConnection cn = (HttpURLConnection) url.openConnection();
			cn.setConnectTimeout(5 * 1000);
			cn.setRequestMethod("GET");
			System.out.println("stream=======" + cn.getInputStream());
			InputStreamReader in = new InputStreamReader(cn.getInputStream());
			System.out.println("in======" + in);
			BufferedReader bu = new BufferedReader(in);

			String line = bu.readLine().toString();
			System.out.println("ling=====" + line);
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ProtocolException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}