Exception opening socket

com.mongodb.MongoSocketOpenException: Exception opening socket
	at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:67) ~[mongodb-driver-core-3.8.2.jar:na]
	at com.mongodb.internal.connection.InternalStreamConnection.open(InternalStreamConnection.java:126) ~[mongodb-driver-core-3.8.2.jar:na]
	at com.mongodb.internal.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:117) ~[mongodb-driver-core-3.8.2.jar:na]
	at java.base/java.lang.Thread.run(Thread.java:844) [na:na]
Caused by: java.net.ConnectException: Connection refused: connect
	at java.base/java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:na]
	at java.base/java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:na]
	at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:400) ~[na:na]
	at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:243) ~[na:na]
	at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:225) ~[na:na]
	at java.base/java.net.PlainSocketImpl.connect(PlainSocketImpl.java:148) ~[na:na]
	at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:402) ~[na:na]
	at java.base/java.net.Socket.connect(Socket.java:591) ~[na:na]
	at com.mongodb.internal.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:64) ~[mongodb-driver-core-3.8.2.jar:na]
	at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:62) ~[mongodb-driver-core-3.8.2.jar:na]
	... 3 common frames omitted

解决办法：

1.检查我们的SpringBoot项目的配置文件的MongoDB的ip地址是否有错误；

2.利用远程连接工具secureCRT，输入ip addr，查看ip地址，结果会发现配置文件的ip和远程ip不一致，我们只需要将其改正一下，SpringBoot就可以正常运行MongoDB了。