mongodb3.x java 驱动 基本操作

      

     1.使用maven安装驱动（也可以手动下载jar包导入项目）： 

<dependency>
	<groupId>org.mongodb</groupId>
	<artifactId>mongo-java-driver</artifactId>
	<version>3.2.0</version>
</dependency>

     2.连接mongodb得到MongoClient

// To directly connect to a single MongoDB server
// (this will not auto-discover the primary even if it's a member of a replica set)
MongoClient mongoClient = new MongoClient();

// or
MongoClient mongoClient = new MongoClient( "localhost" );

// or
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );

// or, to connect to a replica set, with auto-discovery of the primary, supply a seed list of members
MongoClient mongoClient = new MongoClient(
  Arrays.asList(new ServerAddress("localhost", 27017),
                new ServerAddress("localhost", 27018),
                new ServerAddress("localhost", 27019)));

// or use a connection string
MongoClientURI connectionString = new MongoClientURI("mongodb://localhost:27017,localhost:27018,localhost:27019");
MongoClient mongoClient = new MongoClient(connectionString);

    3.CRUD操作

// insert
Document $doc 
 = new Document("_id", "abcd").append("name", "xiaoming");
mongoClient().getDatabase(database).getCollection(collection).insertOne($doc);
mongoClient().getDatabase(database).getCollection(collection).insertOne($doc);

// delete
mongoClient().getDatabase(db).getCollection(coll).deleteOne(new Document("_id", "abcd"));

// find
Document doc = mongoClient().getDatabase(database).getCollection(collection).find(new Document("name", "xiaoming")).first();
System.out.println(doc);

// update
mongoClient().getDatabase(database).getCollection(collection).updateOne(new Document("_id", "abcd"), new Document("$set", new Document("name",  "xiaowu")));

// close
mongoClient.close();