MongoDB 2.4 - Java (GridFS)

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.MongoClient;
import com.mongodb.gridfs.GridFS;
import com.mongodb.gridfs.GridFSDBFile;
import com.mongodb.gridfs.GridFSInputFile;

public class MongoDB {

public static void main(String[] args) throws IOException {
MongoClient client = new MongoClient();
DB database = client.getDB("databaseName");
FileInputStream fileInputStream = null;

GridFS videos = new GridFS(database, "videos");

try {
fileInputStream = new FileInputStream("video.mp4");
} catch (FileNotFoundException e) {
e.printStackTrace();
client.close();
System.exit(1);
}

GridFSInputFile video = videos.createFile(fileInputStream, "video.mp4");
BasicDBObject metadata = new BasicDBObject("description",
"Jennier Singing");
ArrayList<String> tags = new ArrayList<String>();

tags.add("Singing");
tags.add("Opera");
metadata.append("tags", tags);
video.setMetaData(metadata);
video.save();

System.out
.println("Object ID in Files Collection: " + video.get("_id"));
System.out.println("Saved the file to MongoDB");
System.out.println("Now let's read it back out");

GridFSDBFile gridFSDBFile = videos.findOne(new BasicDBObject(
"filename", "video.mp4"));
FileOutputStream fileOutputStream = new FileOutputStream(
"video_copy.mp4");
gridFSDBFile.writeTo(fileOutputStream);

System.out.println("Write the file back out");

fileInputStream.close();
fileOutputStream.close();
client.close();
}
}