Download file sử dụng stream

DowloadFile

package com.phongbm.filemanager;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Created by Huan on 7/3/2016.
 */
public class Downloader {

    private InputStream is;
    private FileOutputStream fos;

    public Downloader() {
    }

    public void dowload(String link, String des) {
        try {
            URL url = new URL(link);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            is = connection.getInputStream();
            File file = new File(des);
            if (file.exists()) {
                file.delete();
            }
            file.createNewFile();
            fos = new FileOutputStream(file);
            byte[] b = new byte[1024];
            int leng = is.read(b);
            while (leng != -1) {
                fos.write(b, 0, leng);
                leng = is.read(b);
            }

            is.close();
            connection.disconnect();


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