Use mongodb to store and read files (pictures, audio, video)

Use mongodb to store and read files (pictures, audio, video)

    Implementation code example:

package mongo.util;

import java.io.File;
import java.io.IOException;
import java.util.List;
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBObject;
import com.mongodb.Mongo;
import com.mongodb.gridfs.GridFS;
import com.mongodb.gridfs.GridFSDBFile;
import com.mongodb.gridfs.GridFSInputFile;

/**
 * Use mongodb to store and read files (pictures, audio, video)
 * @author wangzp
 */
public class Mon_GridFS {

	public static void main(String[] args) throws Exception {
		//saveFile();
		readFile();
	}
    
	/**
     * Store files
	 * @throws IOException
     */
	public static void saveFile() throws IOException{
		//connect to the server, create an instance
		Mongo mongo = new Mongo("127.0.0.1",27017);
		//Connect to the database
		DB db = mongo.getDB("testGridFS");
		//The file is implemented on the basis of DB and has nothing to do with tables and documents
		GridFS gridFS = new GridFS(db);
		
		String fileName = "2-2 Database Design.mp4";
		File readFile = new File("d:/0202/"+fileName);
		GridFSInputFile mongofile = gridFS.createFile(readFile);
		//add the object again
		mongofile.put("path", "d:/0202/"+fileName);
		//keep
		mongofile.save();
	}
	
	/**
	 * read file, write to disk
	 * @throws Exception
	 */
	public static void readFile() throws Exception{
		//1. Connect to the server and create an instance
		Mongo mongo = new Mongo("127.0.0.1",27017);
		//Connect to the database
		DB db = mongo.getDB("testGridFS");
		//The file is implemented on the basis of DB and has nothing to do with tables and documents
		GridFS gridFS = new GridFS(db);
	    
		//2. Find conditions
		DBObject query = new BasicDBObject();
		List<GridFSDBFile> listFile = gridFS.find(query);
		GridFSDBFile gridFSDBFile = listFile.get(0);
		
		//3. Get the file name
		//Note: not the column name of the table in fs, but according to the properties in the debug gridDBFile
		String fileName = (String)gridFSDBFile.get("filename");
		System.out.println("The file name obtained from MongoDB: "+fileName);
		
		//4. Create empty file
		File writeFile = new File("d:/"+fileName);
		if(!writeFile.exists()){
			writeFile.createNewFile();
		}
		
		//5. Write to the file
		gridFSDBFile.writeTo(writeFile);
	}
	
}

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