Exception in thread "main" com.mongodb.MongoTimeoutException: 
Timed out after 30000 ms while waiting for a server that matches
 WritableServerSelector. Client view of cluster state is {type=
UNKNOWN, servers=[{address=hadoop02:12345, type=UNKNOWN, state=
CONNECTING, exception={com.mongodb.MongoSocketOpenException: 
Exception opening socket}, caused by {java.net.SocketTimeoutException:
 connect timed out}}]

解决方法：

1.改配置：conf:    bind_ip:0.0.0.0

mongod.conf

port = 12345
bind_ip=0.0.0.0
dbpath = data/db
logpath = logs/mongod.log
fork = true
replSet=rs0

连不上navite

之后重启就连上了

2.改依赖包：

    <!-- mongodb -->
    <dependency>
	  	<groupId>org.mongodb</groupId>
	  	<artifactId>mongodb-driver</artifactId>
	  	<version>3.11.0</version>
  	</dependency>

3.进入客户端，运行代码就可以了