Springboot启动时，MongoDB连接异常，如何解决MongoSocketOpenException问题？

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Spring Boot启动报错：com.mongodb.MongoSocketOpenException：无法打开socket。详细信息：com.mongodb.MongoSocketOpenException：打开socket异常。

Springboot启动报错：com.mongodb.MongoSocketOpenException:Exceptionopeningsocket:详细错误信息：com.mong

　　详细错误信息：

com.mongodb.MongoSocketOpenException: Exception opening socketat com.mongodb.connection.SocketStream.open(SocketStream.java:63) ~[mongodb-driver-core-3.4.2.jar:na]at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:115) ~[mongodb-driver-core-3.4.2.jar:na]at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:113) ~[mongodb-driver-core-3.4.2.jar:na]at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]

Caused by: java.net.ConnectException: Connection refused: connectat java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_131]at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_131]at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_131]at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_131]at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_131]at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_131]at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_131]at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_131]at com.mongodb.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:57) ~[mongodb-driver-core-3.4.2.jar:na]at com.mongodb.connection.SocketStream.open(SocketStream.java:58) ~[mongodb-driver-core-3.4.2.jar:na]... 3 common frames omitted

在spring boot项目中没有配置 mongodb的信息，启动一直报异常，如果使用 ：

　　@SpringBootApplication(exclude = MongoAutoConfiguration.class)注解取消spring boot的自动配置，项目就启动不了。

求各位大神帮忙解答下，感激不尽。

Spring boot 启动报错：com.mongodb.MongoSocketOpenException: Exception opening socket