首先我們要使用mongdb首先要引入相應的jar包；

mongo-java-driver-3.2.2.jar 

maven中加入依賴：

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongo-Java-driver</artifactId>
    <version>2.13.0</version>
</dependency>
 

import java.util.ArrayList;
import java.util.List;

import com.mongodb.DB;
import com.mongodb.MongoClient;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;

public class MongoManagerUtil {

	/**
	 * 不需要連線認證獲取MongoClient
	 * @param host
	 * @param port
	 * @return
	 */
	public MongoClient clientMongo(String host,int port,String dataName){
		try{   
	       // 連線到 mongodb 服務
	         MongoClient mongoClient = new MongoClient( host , port );
	         // 連線到資料庫
//	         DB date=mongoClient.getDB(dataName);
	         return mongoClient;
	      }catch(Exception e){
	        System.err.println( e.getClass().getName() + ": " + e.getMessage() );
	        return null;
	      }

		
	}
	/**
	 * 通過連線認證獲取MongoClient
	 * @param host
	 * @param port
	 * @param userName
	 * @param dbName
	 * @param psw
	 * @return
	 */
	public MongoClient clientMongo(String host,int port,String userName,String dbName,String psw){
		try{
			ServerAddress serverAddress = new ServerAddress(host,port);
	        List<ServerAddress> addrs = new ArrayList<ServerAddress>();
	        addrs.add(serverAddress);
	        //MongoCredential.createScramSha1Credential()三個引數分別為 使用者名稱 資料庫名稱 密碼
	        MongoCredential credential = MongoCredential.createScramSha1Credential(userName, dbName, psw.toCharArray());
	        List<MongoCredential> credentials = new ArrayList<MongoCredential>();
	        credentials.add(credential);
	        //通過連線認證獲取MongoDB連線
	        MongoClient mongoClient = new MongoClient(addrs,credentials);
	        return mongoClient;
		}catch(Exception e){
			System.err.println( e.getClass().getName() + ": " + e.getMessage() );
	        return null;
		}
	}
}