Retrieves the response data in String format from the specified URL. - Android Network

Android examples for Network:URL

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Description

Retrieves the response data in String format from the specified URL.

Demo Code


import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.text.TextUtils;
import android.util.Log;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class Main{
    private static final String LOG_TAG = HttpUtils.class.getSimpleName();
    /**//from ww w  . j a v  a  2  s . c o  m
     * Retrieves the response data in String format from the specified URL.
     *
     * @param sUrl          the well-formed URL to retrieve the data from
     * @param requestMethod the method used for requesting data (e.g., POST, GET, PUT, DELETE, etc).
     * @return the response data in String format.
     */
    public static String getResponse(String sUrl, String requestMethod) {
        if (TextUtils.isEmpty(sUrl)) {
            throw new RuntimeException(
                    "Passed URL is either null or empty.");
        }
        if (TextUtils.isEmpty(requestMethod)) {
            throw new RuntimeException("Request Method is null or empty");
        }

        HttpURLConnection urlConnection = null;
        BufferedReader reader = null;

        try {
            URL url = new URL(sUrl);

            // Create the request and open the connection
            urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod(requestMethod);
            urlConnection.connect();

            // Read the input stream and convert into a response string
            InputStream inputStream = urlConnection.getInputStream();

            // This should not be changed to StringBuilder as this method must be invoked on a
            // background thread.
            StringBuffer buffer = new StringBuffer();

            if (inputStream == null) {
                return null;
            }

            reader = new BufferedReader(new InputStreamReader(inputStream));
            String line;

            while ((line = reader.readLine()) != null) {
                // Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
                // But it does make debugging a *lot* easier if you print out the completed
                // buffer for debugging.
                buffer.append(line);
                buffer.append("\n");
            }

            if (buffer.length() == 0) {
                // The Stream was empty. No point in pasing
                return null;
            }

            return buffer.toString();
        } catch (IOException e) {
            e.printStackTrace();
            Log.e(LOG_TAG, "Error retrieving data from server", e);
            return null;
        } finally {
            if (urlConnection != null) {
                urlConnection.disconnect();
            }
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    Log.e(LOG_TAG, "Error closing stream", e);
                }
            }
        }
    }
    /**
     * Retrieves the response data in String format from the specified URI.
     *
     * @param uri           the built uri to retrieve data from.
     * @param requestMethod the method used for requesting data (e.g., POST, GET, PUT, DELETE, etc).
     * @return the response data in String format.
     */
    public static String getResponse(Uri uri, String requestMethod) {
        return getResponse(uri.toString(), requestMethod);
    }
}

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