不拆MongoDB解决MongoSocketOpenException: Exception opening socket

问题起源

玩Java Spring Boot全栈项目带有MongoDB, 在spring boot /src/main/resources/application.properties里边定义了mongodb的database和url, 在spring boot项目起的时候报错

com.mongodb.MongoSocketOpenException: Exception opening socket
	at com.mongodb.connection.netty.NettyStream$OpenChannelFutureListener.operationComplete(NettyStream.java:439) ~[mongodb-driver-core-4.1.2.jar:na]
	at com.mongodb.connection.netty.NettyStream$OpenChannelFutureListener.operationComplete(NettyStream.java:407) ~[mongodb-driver-core-4.1.2.jar:na]
	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:578) ~[netty-common-4.1.60.Final.jar:4.1.60.Final]
	at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:571) ~[netty-common-4.1.60.Final.jar:4.1.60.Final]
	at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:550) ~[netty-common-4.1.60.Final.jar:4.1.60.Final]
	at io.netty.util.concurrent.DefaultPromise.notifyListeners(Defa