读取HttpURLConnection

Question

我一直在努力弄清楚如何读HttpURLConnection。根据这个例子：http://www.vogella.com/tutorials/AndroidNetworking/article.html，下面的代码应该可以工作。但是，readStream从不触发，我也不会记录任何行。

我确实知道InputStream是通过缓冲区传递的，但是对我来说，逻辑在readStream方法中分解了，然后大部分是空字符串'line‘和while语句。那里到底发生了什么/应该发生什么，我如何才能解决它？另外，为什么我必须在Try语句中创建url？它返回一个未处理的异常；java.net.MalformedURLException。

提前感谢！

static String SendURL(){
    try {
        URL url = new URL("http://www.google.com/");
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
          readStream (con.getInputStream());
    } catch (Exception e) {
        e.printStackTrace();
    }

    return ("Done");

}

static void readStream(InputStream in) {

    BufferedReader reader = null;

    try {
        reader = new BufferedReader(new InputStreamReader(in));
        String line = "";
        while ((line = reader.readLine()) != null) {
            Log.i("Tag", line);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (reader != null) {
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

Answer 1

我在问题中发布的代码有很多错误。下面是一个有用的例子：

public class GooglePlaces extends AsyncTask {

public InputStream inputStream;


    public GooglePlaces(Context context) {

        String url = "https://www.google.com";


        try {
            HttpRequest httpRequest = requestFactory.buildGetRequest(new GenericUrl(url));
            HttpResponse httpResponse = httpRequest.execute();
            inputStream = httpResponse.getContent();

        } catch (IOException e) {
            e.printStackTrace();
        }


        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
        StringBuilder builder = new StringBuilder();

        try {
            for (String line = null; (line = bufferedReader.readLine()) != null;) {
                builder.append(line).append("\n");
                Log.i("GooglePlacesTag", line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Answer 2

您似乎没有连接您的HTTPUrlClient try con.connect()