How to use Spring to connect to MongoDB which requ

问题:

I am using the below Spring configuration in order to connect to mongoDB

<bean id="mongoTemplate" class="org.springframework.data.document.mongodb.MongoTemplate">
        <constructor-arg name="mongo" ref="mongo"/>
        <constructor-arg name="databaseName" value="${mongodb.dbname}"/>
    </bean>


    <bean class="com.mongodb.MongoURI" id="mongoUri">
        <constructor-arg value="${mongodb.url}"  />
    </bean>

    <bean class="com.mongodb.Mongo" id="mongo">
        <constructor-arg ref="mongoUri" />
    </bean>

where mongo.url=mongodb://<user>:<password>@<host>:27017

However I'm getting an authetication error. My understanding was that MongoUI can take a URL in the above format.

I know that mongoTemplate can accept userCredentials object however I would need to extract them from the URL first and i'm not sure how to do that in the configuration.

Any idea how can I change my config above to suppot this assuming mongo.url format cannot be changed?

回答1:

found the solution using Spring Expression Language

<bean id="mongoTemplate" class="org.springframework.data.document.mongodb.MongoTemplate">
        <constructor-arg name="mongo" ref="mongo"/>
        <constructor-arg name="databaseName" value="${mongodb.dbname}"/>
        <constructor-arg name="userCredentials" ref="mongoCredentials"/>
    </bean>

    <bean id="mongoCredentials" class="org.springframework.data.authentication.UserCredentials">
        <property name="username" value="#{mongoURI.username}" />
        <property name="password" value="#{new java.lang.String(mongoURI.password)}" />
    </bean>

    <bean class="com.mongodb.MongoURI" id="mongoURI">
        <constructor-arg value="${mongodb.url}"  />
    </bean>

    <bean class="com.mongodb.Mongo" id="mongo">
        <constructor-arg ref="mongoURI" />
    </bean>

回答2:

If you want to add authntication using java config

@Configuration
@EnableMongoRepositories("path.to.your.repository")
public class MongoConfig extends AbstractMongoConfiguration
{
@Value("${mongodb.name}")
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;


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

@Override
public Mongo mongo() throws Exception
{
    return new MongoClient(this.host, this.port);
}

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

@Override
@Bean
public MongoTemplate mongoTemplate() throws Exception
{
    final UserCredentials userCredentials = new UserCredentials(this.userName, this.password);

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

    return mongoTemplate;
}

}

回答3:

To update @Lealem Admassu's answer for java config, in Mongo 3 they changed the API, and now it is recommended to use mongo's MongoCredentials instead of UserCredentials.

Here there is a simple example of how to get a MongoClient: http://docs.spring.io/spring-data/mongodb/docs/current/reference/html/#mongo.mongo-3.authentication

The next code can be done modular, but more or less this works for me (I needed a MongoTemplate):

public MongoTemplate getMongoTemplate(String host, int port,
                                      String authenticationDB,
                                      String database,
                                      String user, char[] password)
        throws UnknownHostException {
    return new MongoTemplate(
            new SimpleMongoDbFactory(
                    new MongoClient(
                            new ServerAddress(host, port),
                            Collections.singletonList(
                                    MongoCredential.createCredential(
                                            user,
                                            authenticationDB,
                                            password
                                    )
                            )
                    ),
                    database
            )
    );
}