In previous tutorials, we learned about How to Install Mongodb On Windows platform and Implement CRUD Operations Using MongoDB And Spring Data. This tutorial will help to store,retrieve image file using Mongodb GridFs specification.

Tools and Technologies

Basically we are using below maven dependencies

1. Maven 3.0.4
2. JDK 1.6
3. Spring Core 4.0.3.RELEASE
4. Spring Data Mongodb 1.5.2.RELEASE

Maven Dependencies

We need to define required dependencies and their versions in pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <groupId>org.springframework.data.examples</groupId>
 <artifactId>spring-data-examples</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <name>SpringMongoExamples</name>
 <dependencies>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-core</artifactId>
   <version>4.0.3.RELEASE</version>
  </dependency>
  <dependency>
   <groupId>org.springframework.data</groupId>
   <artifactId>spring-data-mongodb</artifactId>
   <version>1.5.2.RELEASE</version>
  </dependency>

 </dependencies>
 <build>
  <finalName>SpringMongoExamples</finalName>
  <plugins>
   <plugin>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
     <source>1.6</source>
     <target>1.6</target>
    </configuration>
   </plugin>
  </plugins>
 </build>
</project>

org.springframework I am using spring 4.0.3.RELEASE version. we required only spring-core artifact of Spring Framework because this is stand-alone java application

org.springframework.data Spring Data for MongoDB is part of the parent Spring Data project. You can define the respected dependency in pom.xml

Once you define your maven dependencies in pom.xml, please execute the maven command mvn clean install -e so that it will start downloading the respected jars files

FileStorageDao Interface

Here we are going to use DAO pattern to perform Db operation with MongoDb, Which store and retrive the image File. So lets define below methods in FileStorageDao interface.

package com.technicalkeeda.dao;

import java.io.InputStream;
import java.util.List;

import com.mongodb.DBObject;
import com.mongodb.gridfs.GridFSDBFile;

public interface FileStorageDao {

 public String store(InputStream inputStream, String fileName,
   String contentType, DBObject metaData);
 
 public GridFSDBFile retrive(String fileName);

 public GridFSDBFile getById(String id);

 public GridFSDBFile getByFilename(String filename);

 public List findAll();

}

FileStorageDao Implementation

This is MongoDB specific implementation to perform different Image operations using GridFsTemplate similar to MongoTemplate. Its not specific to Image file you can store or save any type of files like .doc, .xls and.pdf etc.

The template can now be injected and used to perform storage and retrieval operations.The store operations take an InputStream, a filename and optionally metadata information about the file to store. The metadata can be an arbitrary object which will be marshalled by the MongoConverter configured with the GridFsTemplate

package com.technicalkeeda.dao;

import java.io.InputStream;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.gridfs.GridFsTemplate;

import com.mongodb.DBObject;
import com.mongodb.gridfs.GridFSDBFile;

public class FileStorageDaoImpl implements FileStorageDao {

 @Autowired
 GridFsTemplate gridFsTemplate;

 public String store(InputStream inputStream, String fileName,
   String contentType, DBObject metaData) {
  return this.gridFsTemplate
    .store(inputStream, fileName, contentType, metaData).getId()
    .toString();
 }

 public GridFSDBFile getById(String id) {
  return this.gridFsTemplate.findOne(new Query(Criteria.where("_id").is(
    id)));
 }

 public GridFSDBFile getByFilename(String fileName) {
  return gridFsTemplate.findOne(new Query(Criteria.where("filename").is(
    fileName)));
 }

 public GridFSDBFile retrive(String fileName)