Android http https访问网络及资源

Http

private String getHttpValue() {
        String str="";
        String url = "http://test";
        URL getUrl;
        HttpURLConnection connection;
        try {
            getUrl = new URL(url);
            connection = (HttpURLConnection) getUrl.openConnection();
            connection.connect();
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String lines;
            while ((lines = reader.readLine()) != null) {
                 str+=lines;
            }
            reader.close();
            connection.disconnect();
        } catch (MalformedURLException e1) {
            e1.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("请求返回内容：\n" + str.toString());
        
        if (str != "") {
            try {
                JSONObject jsonObject = new JSONObject(str);
                str = jsonObject.getString("key");

            } catch (Exception e) {
                Log.e(TAG, e.toString());
            }
        }
        return str;
    }

http获取网络Json参数