Mondo DB with Java for processing Images

Q:Use MongoDB to process semi structured and unstructured data collections such as Rfid, images, blogs use python/Java MongoDB interface.

Testing Environment

Mongo DB version : 2.6.3

Network : switched LAN(Ethernet)

IDE: Eclipse (Java EE)

OS: Fedora 20 (64 bit )

Code 

import com.mongodb.MongoClient;
import com.mongodb.MongoException;
import com.mongodb.WriteConcern;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;
import com.mongodb.DBCursor;
import com.mongodb.ServerAddress;
import com.mongodb.gridfs.GridFS;
import com.mongodb.gridfs.GridFSDBFile;
import com.mongodb.gridfs.GridFSInputFile;

import java.io.File;
import java.util.Arrays;


public class MongoDBJDBC {

public static void main(String args[]){
            /*DB db=(new MongoClient("192.168.4.91",27017)).getDB("te3101");
            DBCollection dbcollection=db.getCollection("chanel");
            BasicDBObject basicDBObject=new BasicDBObject();
            basicDBObject.put("name", "dhiraj");
            basicDBObject.put("subscription", 4100);
            dbcollection.insert(basicDBObject);*/
 
 try{
  
        // To connect to mongodb server
        MongoClient mongoClient = new MongoClient( "192.168.4.91" , 27017 );
   
        // Now connect to your databases
        DB db = mongoClient.getDB( "te3101db" );
        System.out.println("Connect to database successfully");
        boolean auth = db.authenticate("te3101", new String("te3101").toCharArray());
        
        System.out.println("Authentication: "+auth);
        
        
        System.out.println("List of images currently in the database is:");
        listImage(db);
        storeImage(db);
        System.out.println("List of images after storing the image is:");
  listImage(db);
  getImage(db);
  deleteImage(db);
  System.out.println("List of images after deleting the image is:");
  listImage(db);
  
     }catch(Exception e){
        System.err.println( e.getClass().getName() + ": " + e.getMessage() );
     }
  }


public static void storeImage(DB db){
 db.getCollection("imagecollection");
 File imageFile = new File("/home/te/3101/image2.jpg");
 GridFS gfsPhoto = new GridFS(db, "photo");
 try{
 GridFSInputFile gfsFile = gfsPhoto.createFile(imageFile);
 gfsFile.setFilename("newphoto");
 gfsFile.save();
 }
 catch (Exception e){System.out.println("Caught an exception in store image");}
 
 
 }


public static void getImage(DB db){
 db.getCollection("imagecollection");
 try{
  GridFS gfsPhoto = new GridFS(db, "photo");
  GridFSDBFile imageForOutput = gfsPhoto.findOne("newphoto");
  imageForOutput.writeTo("/home/te/3101/mongomage.jpg");
 }catch(Exception e){System.out.println("Error while getting image");}
 
};


public static void deleteImage(DB db){
 db.getCollection("imagecollection");
 try{
  GridFS gfsPhoto = new GridFS(db, "photo");
  gfsPhoto.remove(gfsPhoto.findOne("newphoto"));
 }catch(Exception e){System.out.println("Error while deleteing the collection");}
};




public static void listImage(DB db){
 db.getCollection("imagecollection");
 try{
  GridFS gfsPhoto = new GridFS(db, "photo");
  DBCursor cursor = gfsPhoto.getFileList();
  while (cursor.hasNext()) {
   System.out.println(cursor.next());
  }
 }catch(Exception e){System.out.println("Listing the images error");}

};
 
 

}

Output

 Connect to database successfully
Authentication: true
List of images currently in the database is:
List of images after storing the image is:
{ "_id" : { "$oid" : "57c6a29483145a4fc32d704f"} , "chunkSize" : 262144 , "length" : 25124 , "md5" : "fdfd55e4120b8caa10dfd3b35d6a0b33" , "filename" : "newphoto" , "contentType" :  null  , "uploadDate" : { "$date" : "2016-08-31T09:25:40.304Z"} , "aliases" :  null }
List of images after deleting the image is:

Note

The programming style used in this code simply sucks. I never develop large project using such crappy code. I ask you not to do the same. Though I should never be writing code this way, time constraints make me do so. The is the poorest way, any one code in fact, could handle exceptions.

Moral: Ensure that you give programmers sufficient time. What's good takes time.