how download facebook profile picture in java in my computer disk

Question

I am using below code, its not working.
when i use imageUrl on browser its redirect somewhere then its working.
But i have n number of facebook id only and every time redirected url is different.

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
 import java.net.URL;

public class SaveImageFromUrl {

public static void main(String[] args) throws Exception {
    String imageUrl = "http://graph.facebook.com/67563683055/picture?type=square";
    String destinationFile = "C:\\Users\\emtx\\Desktop\\Nxg-pic.png";

    saveImage(imageUrl, destinationFile);
}

public static void saveImage(String imageUrl, String destinationFile) throws IOException {
    URL url = new URL(imageUrl);
    InputStream is = url.openStream();
    OutputStream os = new FileOutputStream(destinationFile);

    byte[] b = new byte[2048];
    int length;

    while ((length = is.read(b)) != -1) {
        os.write(b, 0, length);
    }

    is.close();
    os.close();
}

}

Pshemo · Answer 1 · 2016-02-14T19:29:19.007

Address you are using redirects you to other location. Since URL class doesn't redirects you automatically what you get is

headers containing information about redirection (like Location which points you to new address),
and possibly body (but in this case it is empty).

You may want to create method like (based on: http://www.mkyong.com/java/java-httpurlconnection-follow-redirect-example/)

public static String getFinalLocation(String address) throws IOException{
    URL url = new URL(address);
    HttpURLConnection conn = (HttpURLConnection)url.openConnection();
    int status = conn.getResponseCode();
    if (status != HttpURLConnection.HTTP_OK) 
    {
        if (status == HttpURLConnection.HTTP_MOVED_TEMP
            || status == HttpURLConnection.HTTP_MOVED_PERM
            || status == HttpURLConnection.HTTP_SEE_OTHER)
        {
            String newLocation = conn.getHeaderField("Location");
            return getFinalLocation(newLocation);
        }
    }
    return address;
}

and change your

URL url = new URL(imageUrl);

to

URL url = new URL(getFinalLocation(imageUrl));

score 0 · Accepted Answer · answered Feb 14 '16 at 19:36

0

In addition to Phsemos answer, you can also disable the redirection with the redirect parameter and use the following API call to get the real URL as JSON:

https://graph.facebook.com/67563683055/picture?type=square&redirect=false

This is how the JSON looks like:

{
   "data": {
      "is_silhouette": false,
      "url": "https://scontent.xx.fbcdn.net/hprofile-xaf1/v/t1.0-1/c44.44.544.544/s50x50/316295_10151906553973056_2129080216_n.jpg?oh=04888b6ef5d631447227b42d82ebd35d&oe=57250EA4"
   }
}

answered Feb 14 '16 at 19:36

andyrandy

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how i can use this in my example. – codePlayer Feb 15 '16 at 09:20
since you just accepted my answer, i guess you found out on your own? either way, there are some stackoverflow threads about that, if you need more information: http://stackoverflow.com/questions/7467568/parsing-json-from-url – andyrandy Feb 15 '16 at 16:08
or that one: http://stackoverflow.com/questions/4308554/simplest-way-to-read-json-from-a-url-in-java – andyrandy Feb 15 '16 at 16:08

how download facebook profile picture in java in my computer disk

2 Answers2