MongoDB - Connection from Remote Database

MongoDB - Connection from  Remote Database

There are multiple ways of doing this things, but I found this one is most suitable.

1. From Standalone
2. From Web Application

Make sure you have added correct maven dependency in your pom.xml like below -
<dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-mongodb-parent</artifactId>
    <version>1.5.2.RELEASE</version>
</dependency>
 
<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongo-java-driver</artifactId>
    <version>2.13.2</version>
</dependency>
 

Web Application - 

Before to use below code, please add property file having credentials and all other required details in it. Read that property file in spring-config.xml. You can use below code to read the property file -

<context:property-placeholder location='classpath:/config/configTest.properties'/>

configTest.properties

mongodb.dbname=
mongodb.host=
mongodb.port=
mongodb.username=
mongodb.password=
mongodb.authenticationdatabase=

Now below code will take the responsibility to get connected from mongodb host.

@Configuration

public class MongoConfiguration extends AbstractMongoConfiguration{

@Value("${mongodb.dbname}")
private String  dbName;

@Value("${mongodb.host}")
private String  host;

@Value("${mongodb.port}")
private Integer port;

@Value("${mongodb.username}")
private String  userName;

@Value("${mongodb.password}")
private String  password;

@Value("${mongodb.authenticationdatabase}")
private String  authenticationDatabase;

@Override
protected String getDatabaseName()  {
    return this.dbName;
}

@Override
public MongoClient mongo() throws Exception {
    List<ServerAddress> serverAddresses = new ArrayList<ServerAddress>();
    ServerAddress address = new ServerAddress(host, port);
    serverAddresses.add(address);
    List<MongoCredential> credentials = new ArrayList<MongoCredential>();
    MongoCredential credential = MongoCredential.createPlainCredential(userName, authenticationDatabase, password.toCharArray());
    credentials.add(credential);
    return new MongoClient(serverAddresses, credentials);
}

@Override
@Bean
public SimpleMongoDbFactory mongoDbFactory() throws Exception {
    return new SimpleMongoDbFactory(mongo(), getDatabaseName());
}

@Override
@Bean
public MongoTemplate mongoTemplate() throws Exception {

    final MongoTemplate mongoTemplate = new MongoTemplate(mongo(), getDatabaseName());
    mongoTemplate.setWriteConcern(WriteConcern.SAFE);
    return mongoTemplate;
}

Standalone Java Program -

A standalone Java Program which tells about how to connect with remote MongoDB server from Java Code.

    String database = "TestDev";

    String username = "user@test.COM";

    String pass = "XXXXX";

    char[] password = pass.toChogram arArray();

    try {

        List<ServerAddress> serverAddresses = new ArrayList<ServerAddress>();

        ServerAddress address = new ServerAddress("hostname", portnumber);

        serverAddresses.add(address);

        List<MongoCredential> credentials = new ArrayList<MongoCredential>();

        MongoCredential credential = MongoCredential.createPlainCredential(username, "$external", password);

        credentials.add(credential);

        MongoClient mongoClient1 = new MongoClient(serverAddresses, credentials);

        DB db = mongoClient1.getDB(database);

        System.out.println(db.getCollectionNames());

        System.out.println("Done");

    } catch (UnknownHostException e) {

        e.printStackTrace();

    }