download Via Http - Android Network

Android examples for Network:HTTP

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Description

download Via Http

Demo Code


import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import android.util.Log;

public class Main{
    /**/*from   w  w w .j  a  v a2 s .c o m*/
     * @param uri URI to retrieve
     * @param type expected text-like MIME type of that content
     * @return content as a {@code String}
     * @throws IOException if the content can't be retrieved because of a bad URI, network problem, etc.
     */
    public static String downloadViaHttp(String uri, ContentType type)
            throws IOException {
        String contentTypes;
        switch (type) {
        case HTML:
            contentTypes = "application/xhtml+xml,text/html,text/*,*/*";
            break;
        case JSON:
            contentTypes = "application/json,text/*,*/*";
            break;
        case TEXT:
        default:
            contentTypes = "text/*,*/*";
        }
        return downloadViaHttp(uri, contentTypes);
    }
    private static String downloadViaHttp(String uri, String contentTypes)
            throws IOException {
        URL url = new URL(uri);
        Log.v("HTTP HELPER", url.toString());
        HttpURLConnection connection = (HttpURLConnection) url
                .openConnection();
        connection.setRequestMethod("GET");
        // connection.setRequestProperty("Accept", contentTypes);
        // connection.setRequestProperty("Accept-Charset", "utf-8,*");
        // connection.setRequestProperty("User-Agent", "ZXing (Android)");
        try {
            connection.connect();
            if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
                throw new IOException("Bad HTTP response: "
                        + connection.getResponseCode());
            }
            return consume(connection);
        } finally {
            connection.disconnect();
        }
    }
    private static String consume(URLConnection connection)
            throws IOException {
        String encoding = getEncoding(connection);
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        InputStream in = connection.getInputStream();
        try {
            in = connection.getInputStream();
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = in.read(buffer)) > 0) {
                out.write(buffer, 0, bytesRead);
            }
        } finally {
            try {
                in.close();
            } catch (IOException ioe) {
                // continue
            }
        }
        try {
            return new String(out.toByteArray(), encoding);
        } catch (UnsupportedEncodingException uee) {
            try {
                return new String(out.toByteArray(), "UTF-8");
            } catch (UnsupportedEncodingException uee2) {
                // can't happen
                throw new IllegalStateException(uee2);
            }
        }
    }
    private static String getEncoding(URLConnection connection) {
        String contentTypeHeader = connection
                .getHeaderField("Content-Type");
        if (contentTypeHeader != null) {
            int charsetStart = contentTypeHeader.indexOf("charset=");
            if (charsetStart >= 0) {
                return contentTypeHeader.substring(charsetStart
                        + "charset=".length());
            }
        }
        return "UTF-8";
    }
}

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