Java
Chilkat2 Java
Facebook Download all Photos to Local Files
See more Facebook Examples
Demonstrates how to download all of one's Facebook photos to a local filesystem directory. This sample code keeps a local cache to avoid re-downloading the same photos twice. The program can be run again after a time, and it will download only photos that haven't yet been downloaded.Chilkat Java Downloads
import com.chilkatsoft.chilkat2.Cache;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.FileAccess;
import com.chilkatsoft.chilkat2.Http;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.OAuth2;
import com.chilkatsoft.chilkat2.Rest;
import com.chilkatsoft.chilkat2.StringArray;
import com.chilkatsoft.chilkat2.StringBuilder;
public class ChilkatExample {
public static void main(String[] args) {
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
// This example will use a local disk cache to avoid re-fetching the same
// photo id after it's been fetched once.
Cache fbCache = new Cache();
// The cache will use 1 level of 256 sub-directories.
fbCache.setLevel(1);
// Use a directory path that makes sense on your operating system..
fbCache.addRoot("C:/fbCache");
// This example assumes a previously obtained an access token
OAuth2 oauth2 = new OAuth2();
oauth2.setAccessToken("FACEBOOK-ACCESS-TOKEN");
Rest rest = new Rest();
// Connect to Facebook.
String responseJson;
try {
rest.connect("graph.facebook.com", 443, true, true);
// Provide the authentication credentials (i.e. the access key)
rest.setAuthOAuth2(oauth2);
// There are two choices:
// We can choose to download the photos the person is tagged in or has uploaded
// by setting type to "tagged" or "uploaded".
rest.addQueryParam("type", "uploaded");
// To download all photos, we begin with an outer loop that iterates over
// the list of photo nodes in pages. Each page returned contains a list of
// photo node ids. Each photo node id must be retrieved to get the download URL(s)
// of the actual image.
// I don't know the max limit for the number of records that can be downloaded at once.
rest.addQueryParam("limit", "100");
// Get the 1st page of photos ids.
// See https://developers.facebook.com/docs/graph-api/reference/user/photos/ for more information.
responseJson = rest.fullRequestNoBody("GET", "/v2.7/me/photos");
} catch (ChilkatException e) {
System.out.println(e.getLastErrorText());
return;
}
JsonObject photoJson = new JsonObject();
StringArray saPhotoUrls = new StringArray();
StringBuilder sbPhotoIdPath = new StringBuilder();
JsonObject json = new JsonObject();
json.setEmitCompact(false);
json.load(responseJson);
int i = 0;
String photoId = "";
String imageUrl = "";
// Get the "after" cursor.
String afterCursor = json.stringOf("paging.cursors.after");
while (json.getLastMethodSuccess()) {
System.out.println("-------------------");
System.out.println("afterCursor = " + afterCursor);
// For each photo id in this page...
i = 0;
int numItems = json.sizeOfArray("data");
while (i < numItems) {
json.setI(i);
photoId = json.stringOf("data[i].id");
System.out.println("photoId = " + photoId);
// We need to fetch the JSON for this photo. Check to see if it's in the local disk cache,
// and if not, then get it from Facebook.
String photoJsonStr = null;
try {
photoJsonStr = fbCache.fetchText(photoId);
} catch (ChilkatException e) {
// It's not locally available, so get it from Facebook..
sbPhotoIdPath.clear();
sbPhotoIdPath.append("/v2.7/");
sbPhotoIdPath.append(photoId);
rest.clearAllQueryParams();
rest.addQueryParam("fields", "id,album,images");
System.out.println("Fetching photo node from Facebook...");
// This REST request will continue using the existing connection.
// If the connection was closed, it will automatically reconnect to send the request.
try {
photoJsonStr = rest.fullRequestNoBody("GET", sbPhotoIdPath.getAsString());
} catch (ChilkatException e2) {
System.out.println(e2.getLastErrorText());
return;
}
// Add the photo JSON to the local cache.
fbCache.saveTextNoExpire(photoId, "", photoJsonStr);
}
// Parse the photo JSON and add the main photo download URL to saPhotoUrls
// There may be multiple URLs in the images array, but the 1st one is the largest and main photo URL.
// The others are smaller sizes of the same photo.
photoJson.load(photoJsonStr);
imageUrl = photoJson.stringOf("images[0].source");
if (imageUrl != null) {
// Actually, we'll add a small JSON document that contains both the image ID and the URL.
JsonObject imgUrlJson = new JsonObject();
imgUrlJson.appendString("id", photoId);
imgUrlJson.appendString("url", imageUrl);
saPhotoUrls.append(imgUrlJson.emit());
System.out.println("imageUrl = " + imageUrl);
}
i = i + 1;
}
// Prepare for getting the next page of photos ids.
// We can continue using the same REST object.
// If already connected, we'll continue using the existing connection.
// Otherwise, a new connection will automatically be made if needed.
rest.clearAllQueryParams();
rest.addQueryParam("type", "uploaded");
rest.addQueryParam("limit", "20");
rest.addQueryParam("after", afterCursor);
// Get the next page of photo ids.
try {
responseJson = rest.fullRequestNoBody("GET", "/v2.7/me/photos");
} catch (ChilkatException e) {
System.out.println(e.getLastErrorText());
return;
}
json.load(responseJson);
afterCursor = json.stringOf("paging.cursors.after");
}
System.out.println("No more pages of photos.");
// Now iterate over the photo URLs and download each to a file.
// We can use Chilkat HTTP. No Facebook authorization (access token) is required to download
// the photo once the URL is known.
Http http = new Http();
// We'll cache the image data so that if run again, we don't re-download the same image again.
int numUrls = saPhotoUrls.getCount();
i = 0;
JsonObject urlJson = new JsonObject();
FileAccess fac = new FileAccess();
while (i < numUrls) {
urlJson.load(saPhotoUrls.getString(i));
photoId = urlJson.stringOf("id");
imageUrl = urlJson.stringOf("url");
// Check the local cache for the image data.
// Only download and save if not already cached.
ERROR: Invalid type for Chilkat2 Java: pbytes
ERROR: Method not in Chilkat2 Java: Cache.FetchFromCache
imageBytes = fbCache.ERROR();
if (!fbCache.getLastMethodSuccess()) {
// This photo needs to be downloaded.
StringBuilder sbImageUrl = new StringBuilder();
sbImageUrl.append(imageUrl);
// Let's form a filename..
String extension = ".jpg";
if (sbImageUrl.contains(".gif", false)) {
extension = ".gif";
}
if (sbImageUrl.contains(".png", false)) {
extension = ".png";
}
if (sbImageUrl.contains(".tiff", false)) {
extension = ".tiff";
}
if (sbImageUrl.contains(".bmp", false)) {
extension = ".bmp";
}
StringBuilder sbLocalFilePath = new StringBuilder();
sbLocalFilePath.append("C:/Photos/facebook/uploaded/");
sbLocalFilePath.append(photoId);
sbLocalFilePath.append(extension);
ERROR: Invalid type for Chilkat2 Java: pbytes
ERROR: Method not in Chilkat2 Java: Http.QuickGet
imageBytes = http.ERROR();
if (!http.getLastMethodSuccess()) {
System.out.println(http.getLastErrorText());
return;
}
// We've downloaded the photo image bytes into memory.
// Save it to the cache AND save it to the output file.
ERROR: Method not in Chilkat2 Java: Cache.SaveToCacheNoExpire
fbCache.ERROR();
ERROR: Method not in Chilkat2 Java: FileAccess.WriteEntireFile
fac.ERROR();
System.out.println("Downloaded to " + sbLocalFilePath.getAsString());
}
i = i + 1;
}
System.out.println("Finished downloading all Facebook photos!");
}
}