java通过URL读取json数据

打开URL，读流：

public static String loadJson (String url) {  
        StringBuilder json = new StringBuilder();  
        try {  
            URL urlObject = new URL(url);  
            URLConnection uc = urlObject.openConnection();  
            BufferedReader in = new BufferedReader(new InputStreamReader(uc.getInputStream()));  
            String inputLine = null;  
            while ( (inputLine = in.readLine()) != null) {  
                json.append(inputLine);  
            }  
            in.close();  
        } catch (MalformedURLException e) {  
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
        return json.toString();  
    }  

main方法测试：

public static void main(String[] args) {  
        String url = "http://api.map.baidu.com/telematics/v3/weather?location=%E6%88%90%E9%83%BD&output=json&ak=rnm8udmHdWaHFWZTO2tuTiG8";  
// String url = "http://www.kuaidi100.com/query?type=yunda&postid=1201386764793"; 
        String json = loadJson(url);  
        System.out.println(json);