关于网页访问的问题，大佬速进

最近写了一个小程序来下载Bing搜索的背景图片，可是出现了一些问题：无论我如何修改，下载下来的始终是，www.bing.com/?mtk=ZN-CN这个网页的背景图片，然而我想下载的是www.bing.com/?mtk=EN-US的背景图片
下面是源码：

 import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ReceiveBingPicture {
    private static String URL = "";//在网页中的链接
/**
 * 获取图片的真实链接
 * @param url
 * @return
 */
    public static String ReceiveUrl(String url) {
        String data = "";
        BufferedReader in = null;
        try {
            URL realurl = new URL(url);
            HttpURLConnection conntection = (HttpURLConnection) realurl.openConnection();
            conntection.connect();
            in = new BufferedReader(new InputStreamReader(conntection.getInputStream()));
            String line = "";
            while ((line = in.readLine()) != null) {
                data += line;
            }
            String pattern = "/az/hprichbg.*?.jpg";//正则表达式将连接过滤出来
            Pattern r = Pattern.compile(pattern);
            Matcher m = r.matcher(data);
            m.find();
            URL = m.group(0);
            System.out.println(URL);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return url + URL;
    }
/**
 * 由真实链接下载图片
 * @param urlStr
 * @throws IOException
 */
    private static void DownloadBingPicture(String urlStr) throws IOException {
        URL url = new URL(urlStr);
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
        String fileName = df.format(new Date()) + ".jpg";
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        System.out.println(InetAddress.getLocalHost().getHostAddress());
        conn.setConnectTimeout(3 * 1000);
        //conn.setRequestProperty("User-Agent", "Mozilla/5.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
        InputStream inputStream = conn.getInputStream();
        byte[] getData = readInputStream(inputStream);
        File saveDir = new File("D:/");
        if (!saveDir.exists()) {
            saveDir.mkdir();
        }
        File file = new File(saveDir + File.separator + fileName);
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(getData);
        if (fos != null) {
            fos.close();
        }
        if (inputStream != null) {
            inputStream.close();
        }
        System.out.println("picture download successs");
    }

    public static byte[] readInputStream(InputStream inputStream) throws IOException {
        byte[] buffer = new byte[1024];
        int len = 0;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while ((len = inputStream.read(buffer)) != -1) {
            bos.write(buffer, 0, len);
        }
        bos.close();
        return bos.toByteArray();
    }

    public static void main(String[] args) throws IOException {
        DownloadBingPicture(ReceiveUrl("https://www.bing.com/?mtk=EN-US"));
    }

}

首先两个网站的背景图片不是一样的吗？
你可以设置windows的地区，设置到美国，应该就能访问到https://www.bing.com/?mtk=EN-US