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How to Retrieve the Download Link for Large Video Files

I would like to retrieve the download link for large video files. I have no problems with small video files but with large videos, the response from the server is that the file
"exceeds the maximum file size that Google can scan"
I want to use the link as the source to a video tag. But because that link gives me the error, I can't use it.
I'm using the Java SDK and I'm using File.getWebContentLink() to get the link. I've tried getDownloadLink() but that one doesn't even work.
Basically, is there anyway I can get the download link for large video files?

getWebContentLink() is designed for interactive users (browsers).
Instead, at the raw API level you'll want to use File.get with alt=Media AND also set the acknowledgeAbuse flag if you initially get returned the 'Google can't scan'. Read more on downloading files here and the abuse flag here.
In the Java client library, it'd look something like this:
String fileId = "0BwwA4oUTeiV1UVNwOHItT0xfa2M";
OutputStream outputStream = new ByteArrayOutputStream();
driveService.files().get(fileId)
.set("acknowledgeAbuse", true)
.executeMediaAndDownloadTo(outputStream);
Disclaimer, I haven't compiled the above.
Note: Do not use the .../host/id method mentioned in the other answer - that method is deprecated and scheduled to stop serving content by end of August, 2016 (this year)

Try using https://googledrive.com/host/id where id is the file's ID. Inspired by http://www.scriptscoop2.com/t/1eb5579419c6/issue-when-trying-to-stream-a-video-from-google-drive-inside-html5-vid.html.

Using java or javascript instead of Google app script

From Google app script (https://developers.google.com/apps-script/),I got this:-
var doc = DocumentApp.create('Hello, World');
// Access the body of the document, then add a paragraph.
doc.getBody().appendParagraph('This document was created by Google Apps Script.');
// Get the URL of the document.
var url = doc.getUrl();
What I would like to do is to be able to duplicate this from my javascript or java code so I can create a doc and get its URL. Any help is appreciated.

You'll need to use the Google Drive API.

Replacing text in Google document from Java

I have a document (native Google doc) in Google Drive that I need to update from my Java app. What I did so far is to download the doc as html
String downloadUrl = doc.getExportLinks().get("text/html");
HttpResponse resp = service.getRequestFactory()
.buildGetRequest(new GenericUrl(downloadUrl))
.execute();
String contents = IOUtils.toString(resp.getContent());
Then I update the contents in the String object and send the update to Drive:
ByteArrayContent mediaContent = ByteArrayContent.fromString("text/html", contents);
service.files().update(doc.getId(), doc, mediaContent).execute();
This works fine for very simple documents. But if the document contains an image, it disappears. The src attribute of the img tag is empty.
Does Google provide some other methods of updating the contents of a Google Document? Is there an API similar to the Google Spreadsheet API?

Unfortunately Google doesn't provide a fine-grained REST API for manipulating the contents of a Google Docs document. Google Apps Script provides a service that does this, but it may be difficult to integrate it into your Java application.

OpenSearch Compatible Response From Java

Here is an example OpenSearch description file:
http://webcat.hud.ac.uk/OpenSearch.xml
When I send a query as like that:
http://webcat.hud.ac.uk/perl/opensearch.pl?keyword=new&startpage=1&itemsperpage=20
I get a response which is compatible to OpenSearch. How can I implement OpenSearch specification at Java or is there any library for it or is there any xsd that I can generate a Java code from it?

According to the OpenSearch website's section on "Reading OpenSearch", there is a Java library which can do this, called Apache Abdera. I have not used it myself, so I cannot comment on its quality, but it should be worth looking into - apparently it can both interpret AND create OpenSearch responses, so this may be exactly what you're looking for.
Alternatively, there are quite a few very good XML parsers for Java (see this question for some suggestions), so writing your own parser for a simple OpenSearch XML file shouldn't be too difficult, since the full specification is available online.
As for an XSD, I can't find an "official" one, however there are XSD's for OpenSearch in various open source projects which have been tested and you can use, such as this one, which is part of a project called "OpenSearch Validator."
Another potential choice for writing OpenSearch results is the very mature and widely-used Apache Lucene library, which is in the list of software "writing OpenSearch results" in the previously linked OpenSearch website.

ROME also supports OpenSearch with its ROME Module A9 OpenSearch.
Sample usage:
SyndFeed feed = new SyndFeedImpl();
feed.setFeedType(feedType);
// Add the opensearch module, you would get information like totalResults from the
// return results of your search
List mods = feed.getModules();
OpenSearchModule osm = new OpenSearchModuleImpl();
osm.setItemsPerPage(1);
osm.setStartIndex(1);
osm.setTotalResults(1024);
osm.setItemsPerPage(50);
OSQuery query = new OSQuery();
query.setRole("superset");
query.setSearchTerms("Java Syndication");
query.setStartPage(1);
osm.addQuery(query);
Link link = new Link();
link.setHref("http://www.bargainstriker.com/opensearch-description.xml");
link.setType("application/opensearchdescription+xml");
osm.setLink(link);
mods.add(osm);
feed.setModules(mods);
// end add module

PDFJET Does Not Work For En Empty Constructor

i want to use pdfjet for a Google app engine project.
i downloaded the Java jar from the pPdfjet home page.
i followed an example given in a stack-overflow example and the examples given in the home page.
all the examples uses an empty constructor: PDF pdf=new PDF();. However when i try to use it,
it says that the constructor PDF() is undefined, further more all the method shown do not work:
pdf.wrap(): is undefined
pdf.save("Example_03.pdf"): is undefined

It looks like the examples on their web page are out of date. Look at the examples in the zip download instead. This simple example works for me:
OutputStream out = new FileOutputStream("test.pdf");
PDF pdf = new PDF(out);
Page page = new Page(pdf, Letter.PORTRAIT);
pdf.flush();
out.close();

Ok this is easy. Actually instead of taking from req.getOutputStream() directly create and instance of BytArrayOutputStream and use that.
For sending it just use out.toArray() as add it to the attacement part.