mongodb数据库连接时，我们可以配置一个mongodb.xml就可以实现连接  如下：
<?xml version=”1.0″ encoding=”UTF-8″?>
<beans xmlns=”http://www.springframework.org/schema/beans”
xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”
xmlns:context=”http://www.springframework.org/schema/context”
xmlns:mongo=”http://www.springframework.org/schema/data/mongo”
xsi:schemaLocation=”http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/data/mongo
http://www.springframework.org/schema/data/mongo/spring-mongo.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd”>

<!– 加载mongodb的属性配置文件 –>
<context:property-placeholder location=”classpath:*.properties” />

<!– 定义mongo对象，对应的是mongodb官方jar包中的Mongo，replica-set设置集群副本的ip地址和端口 –>
<mongo:mongo id=”mongo” replica-set=”${mongo.hostport}”>

<!– 一些连接属性的设置 –>
<mongo:options
connections-per-host=”${mongo.connectionsPerHost}”
threads-allowed-to-block-for-connection-multiplier=”${mongo.threadsAllowedToBlockForConnectionMultiplier}”
connect-timeout=”${mongo.connectTimeout}”
max-wait-time=”${mongo.maxWaitTime}”
auto-connect-retry=”${mongo.autoConnectRetry}”
socket-keep-alive=”${mongo.socketKeepAlive}”
socket-timeout=”${mongo.socketTimeout}”
slave-ok=”${mongo.slaveOk}”
write-number=”1″
write-timeout=”0″
write-fsync=”true”/>
</mongo:mongo>

<mongo:db-factory
dbname=”database”
username=”han”
password=”906016″
mongo-ref=”mongo”
/>

<!–   <mongo:db-factory dbname=”database” mongo-ref=”mongo” />–>

<!– 默认Mongodb类型映射 –>
<bean id=”defaultMongoTypeMapper” class=”org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper”>
<constructor-arg name=”typeKey”>
<null /><!– 这里设置为空,可以把 spring data mongodb 多余保存的_class字段去掉 –>
</constructor-arg>
</bean>

<bean id=”mongoTemplate” class=”org.springframework.data.mongodb.core.MongoTemplate”>
<constructor-arg ref=”mongo” />
<constructor-arg name=”databaseName” value=”duola” />
</bean>
</beans>
但是这种配置是没有权限的访问，一但加入权限  用户名和密码  我们该怎么配置才能连接上去？

<mongo:mongo-client id="mongo" host="192.168.3.98" port="27017" credentials="用户名:密码@拥有权限的数据库">
<mongo:mongo-client>