项目没有使用 MongoDB 却每次启动时会出现如下异常信息：
10:41:41.288 [main] INFO o.m.d.cluster - Cluster created with settings {hosts=[localhost:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
10:41:41.361 [cluster-ClusterId{value='5dae6c654d4299250bde1b44', description='null'}-localhost:27017] INFO o.m.d.cluster - Exception in monitor thread while connecting to server localhost:27017
com.mongodb.MongoSocketOpenException: Exception opening socket
at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:67)
at com.mongodb.internal.connection.InternalStreamConnection.open(InternalStreamConnection.java:126)
at com.mongodb.internal.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:117)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.ConnectException: 拒绝连接 (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at com.mongodb.internal.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:64)
at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:62)
... 3 common frames omitted
解决方法
// 在 Application 主类上添加注解
// 方式一：
@EnableAutoConfiguration(exclude={MongoAutoConfiguration.class, MongoDataAutoConfiguration.class})
// 方式二：
@SpringBootApplication(exclude = {MongoAutoConfiguration.class, MongoDataAutoConfiguration.class})
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