1.更接近原生mongodb
public class MongoApp {
private static final Log log = LogFactory.getLog(MongoApp.class);
public static void main(String[] args) throws Exception {MongoOperations mongoOps = new MongoTemplate(new MongoClient(), "database");
mongoOps.insert(new Person("Joe", 34));
log.info(mongoOps.findOne(new Query(where("name").is("Joe")), Person.class)); mongoOps.dropCollection("person");
} }
2.@Configuration public class AppConfig { /* * Use the standard Mongo driver API to create a com.mongodb.MongoClient instance. */          public @Bean MongoClient mongoClient() {            return new MongoClient("localhost"); } }
3.@Configuration public class AppConfig { /* * Factory bean that creates the com.mongodb.MongoClient instance */ public @Bean MongoClientFactoryBean mongo() {      MongoClientFactoryBean mongo = new MongoClientFactoryBean();      mongo.setHost("localhost"); return mongo; } }
4. http://www.springframework.org/schema/data/mongo http://www.springframework.org/schema/data/mongo/spring-mongo.xsd

5.spring与mongodb的整合
<context:property-placeholder location="classpath:/com/myapp/mongodb/config/mongo.properties"/><mongo:mongo-client host="${mongo.host}" port="${mongo.port}"><mongo:client-optionsconnections-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-client><mongo:db-factory dbname="database" mongo-ref="mongoClient"/><bean id="anotherMongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate"><constructor-arg name="mongoDbFactory" ref="mongoDbFactory"/>
</bean>MongodbTemplate一旦配置好，是线程安全的的，可以跨多个实例使用

@Configuration
public class AppConfig {public @Bean MongoClient mongoClient() {return new MongoClient("localhost");}public @Bean MongoTemplate mongoTemplate() {return new MongoTemplate(mongoClient(), "mydatabase");}
}

mongodb的构造函数:
MongoTemplate(MongoClient mongo, String databaseName):
MongoTemplate(MongoDbFactory mongoDbFactory):
MongoTemplate(MongoDbFactory mongoDbFactory, MongoConverter mongoConverter): <mongo:mongo-client host="localhost" port="27017"/>
<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate"><constructor-arg ref="mongoClient"/><constructor-arg name="databaseName" value="geospatial"/>
</bean>

public class MongoApp {private static final Log log = LogFactory.getLog(MongoApp.class);public static void main(String[] args) {MongoOperations mongoOps = new MongoTemplate(new SimpleMongoDbFactory(new MongoClient(), "database"));Person p = new Person("Joe", 34);// Insert is used to initially store the object into the database.
    mongoOps.insert(p);log.info("Insert: " + p);// Findp = mongoOps.findById(p.getId(), Person.class);log.info("Found: " + p);// UpdatemongoOps.updateFirst(query(where("name").is("Joe")), update("age", 35), Person.class);p = mongoOps.findOne(query(where("name").is("Joe")), Person.class);log.info("Updated: " + p);// Delete
    mongoOps.remove(p);// Check that deletion workedList<Person> people =  mongoOps.findAll(Person.class);log.info("Number of people = : " + people.size());mongoOps.dropCollection(Person.class);}
}