package com.mindzgroup.android.utilities;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * A class to download the contents from any url
 * <p><strong>Author:</strong> Anant Anand Gupta<br/>
 * <strong>Date:</strong> 6 December 2015<br/>
 * <strong>Name:</strong> DownloadManager<br/>
 * <strong>Usage:</strong> <br/> <pre>{@code
 *      // get the string data from url
 *      DownloadManager.getStringFromURL(new URL("http://www.google.com/");
 *
 *      // get the binary data from url
 *      DownloadManager.getBytesFromURL(new URL("http://www.google.com/");
 * }
 * </pre></p>
 */
public class DownloadManager {
    
    public static String getStringFromURL(URL url) throws IOException {
        String retData = null;
        byte[] byteData = getBytesFromURL(url);
        if (byteData != null) {
            retData = new String(byteData);
        }
        return retData;
    }

    public static byte[] getBytesFromURL(URL url) throws IOException {
        byte[] retData;

        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.setRequestProperty("User-Agent", "Mozilla/5.0 ( compatible ) ");
        urlConnection.setRequestProperty("Accept", "*/*");
        urlConnection.setRequestMethod("GET");
        urlConnection.setDoOutput(false);
        urlConnection.connect();

        boolean isError = urlConnection.getResponseCode() >= 400;

        InputStream inputStream = isError ? urlConnection.getErrorStream() : urlConnection.getInputStream();

        if (!isError) {
            retData = StreamManager.ReadBytesFromStream(inputStream);
        } else {
            retData = null;
        }

        if (inputStream != null) {
            inputStream.close();
        }

        urlConnection.disconnect();

        return retData;
    }
}

package com.mindzgroup.android.utilities;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * A class to read data from InputStream
 * <p><strong>Author:</strong> Anant Anand Gupta<br/>
 * <strong>Date:</strong> 6 December 2015<br/>
 * <strong>Name:</strong> StreamManager<br/>
 * <strong>Usage:</strong> <br/> <pre>{@code
 *      // get the string data from url
 *      StreamManager.readStringFromStream(inputStream);
 *
 *      // get the binary data from url
 *      StreamManager.readBytesFromStream(inputStream);
 * }
 * </pre></p>
 */
public class StreamManager {

    public static byte[] readBytesFromStream(InputStream inputStream) throws IOException {
        ByteArrayOutputStream contents = new ByteArrayOutputStream();
        int bufferLength;

        // create a buffer...
        byte[] buffer = new byte[10240];

        while ((bufferLength = inputStream.read(buffer)) > 0) {
            contents.write(buffer,0,bufferLength);
        }
        return contents.toByteArray();
    }

    public static String readStringFromStream(InputStream inputStream) throws IOException {
        String contents = "";
        int bufferLength;

        // create a buffer...
        byte[] buffer = new byte[10240];

        while ((bufferLength = inputStream.read(buffer)) > 0) {
            String readData = new String(buffer,0,bufferLength);
            contents += readData;
        }
        return contents;
    }
}