Storing images in your documentDB — MongoDB

MongoDB has special API called GridFS to manipulate the files. It stores the files as bit chunks with 256k. Then we can retrieve the bit sequence to a image again. Keep remember to create a separate namespace to store these image files. I have used a namespace called photo — GridFS gfsPhoto = new GridFS(db,”photo”);

Here is the Java code on how to store an image and retrieve it.

[sourcecode language=”java”]
package com.technodyne.core;

import java.io.File;
import java.io.IOException;
import java.net.UnknownHostException;

import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.Mongo;
import com.mongodb.MongoException;
import com.mongodb.gridfs.GridFS;
import com.mongodb.gridfs.GridFSDBFile;
import com.mongodb.gridfs.GridFSInputFile;

public class SaveImage {

public static void main(String[]args){

try {

Mongo mongo = new Mongo(“127.0.0.1”,27017);
DB db = mongo.getDB(“imagedb”);
DBCollection collection = db.getCollection(“dummyImageCollection”);

String newFileName = “technodyne-java-image”;
File imageFile = new File(“C:UsersSUPUNDesktopimages.jpg”);

GridFS gfsPhoto = new GridFS(db,”photo”);
try {
GridFSInputFile gfsFile = gfsPhoto.createFile(imageFile);
gfsFile.setFilename(newFileName);
gfsFile.save();

DBCursor cursor = gfsPhoto.getFileList();
while(cursor.hasNext()){
System.out.println(cursor.next());
}

GridFSDBFile imageForOutput = gfsPhoto.findOne(newFileName);
imageForOutput.writeTo(“C:UsersSUPUNDesktopjava-monngo-image.jpg”);
gfsPhoto.remove(gfsPhoto.findOne(newFileName));

System.out.println(“Done”);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

} catch (UnknownHostException e) {
// TODO: handle exception
e.printStackTrace();
}
catch(MongoException e){
e.printStackTrace();
}
}
}[/sourcecode]