Java连接mongodb数据库

/**
     * 带有身份认证的连接
     *
     * @param userName
     * @param database
     * @param password
     * @param host
     * @param port
     * @param databaseName
     * @param collectionName
     * @return
     */
    public static MongoCollection<Document> mongoDBConn(String userName, String database, String password, String host, int port, String databaseName, String collectionName) {
        MongoCredential credential = MongoCredential.createCredential(userName, database, password.toCharArray());
        ServerAddress address = new ServerAddress(host, port);
        MongoClient mongoClient = new MongoClient(address, Arrays.asList(credential));

        //得到数据库
        MongoDatabase database1 = mongoClient.getDatabase(databaseName);
        //得到集合
        MongoCollection<Document> collection = database1.getCollection(collectionName);
        return collection;
    }

注：database和databaseName不同。一般database在默认的情况下是admin。databaseName是要连接的数据库名称。