Java 连接MongoDB集群的几种方式

import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
import com.mongodb.ServerAddress;
import com.mongodb.MongoCredential;
import com.mongodb.MongoClientOptions;

MongoClient mongoClient = new MongoClient(new MongoClientURI(\"mongodb://host1:27017\"));

MongoClient mongoClient = new MongoClient( new MongoClientURI(\"mongodb://host1:27017,host2:27017,host3:27017\"));​

MongoClient mongoClient = new MongoClient(
Arrays.asList(new ServerAddress(\"host1\", 27017),
              new ServerAddress(\"host2\", 27017),
              new ServerAddress(\"host3\", 27017)));

MongoClient mongoClient = new MongoClient(
   Arrays.asList(new ServerAddress(\"host1\", 27017),
                 new ServerAddress(\"host2\", 27017)));

MongoClientURI uri = new MongoClientURI(\"mongodb://user1:pwd1@host1/?authSource=db1&ssl=true\");
MongoClient mongoClient = new MongoClient(uri);

String user; // the user name
 String data ; // the name of the data  in which the user is defined
 char[] password; // the password as a character array
 // ...
 MongoCredential credential = MongoCredential.createCredential(user, data , password);
 MongoClientOptions options = MongoClientOptions.builder().sslEnabled(true).build();
 MongoClient mongoClient = new MongoClient(new ServerAddress(\"host1\", 27017),
                                           Arrays.asList(credential),
                                           options);