下载视频

/**
 from
* N  o w  J a v a . c o m 
**/

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.text.MessageFormat;


public class Main{

    public static String downloadVideo(String url, String path,

            IProgressable downloadProgress) {

        InputStream input = null;

        OutputStream output = null;

        HttpURLConnection connection = null;

        try {

            connection = (HttpURLConnection) new URL(url).openConnection();/*来自 时 代 J a v a 公 众 号*/

            connection.connect();


            // expect HTTP 200 OK, so we don't mistakenly save error report

            // instead of the file

            if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {

                return MessageFormat.format(

                        "Server returned HTTP ({0}): {1}",

                        connection.getResponseCode(),

                        connection.getResponseMessage());

            }


            // this will be useful to display download percentage

            // might be -1: server did not report the length

            int fileLength = connection.getContentLength();


            // download the file

            input = connection.getInputStream();

            output = new FileOutputStream(path);


            byte data[] = new byte[4096];

            long total = 0;

            int count;

            while ((count = input.read(data)) != -1) {

                // allow canceling with back button

                /*

                if (isCancelled()) {

                   input.close();

                   return null;

                }

                 */

                total += count;

                // publishing the progress....

                if (fileLength > 0) // only if total length is known

                    downloadProgress.progress(total * 100.0 / fileLength);

                output.write(data, 0, count);

            }

        } catch (Exception e) {

            return e.t