spring boot整合MongoDB报错，MongoCommandException: Command failed with error 18 (Authenticati_com.mongodb.mongocommandexception: command failed

按照书中代码敲完后，报错如下：

com.mongodb.MongoCommandException: Command failed with error 18 (AuthenticationFailed): 'Authentication failed.' on server 192.168.64.128:27017. The full response is {"ok": 0.0, "errmsg": "Authentication failed.", "code": 18, "codeName": "AuthenticationFailed"}
	at com.mongodb.internal.connection.ProtocolHelper.getCommandFailureException(ProtocolHelper.java:175) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.InternalStreamConnection.receiveCommandMessageResponse(InternalStreamConnection.java:303) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:259) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.CommandHelper.sendAndReceive(CommandHelper.java:83) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.CommandHelper.executeCommand(CommandHelper.java:33) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.SaslAuthenticator.sendSaslStart(SaslAuthenticator.java:130) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.SaslAuthenticator.access$100(SaslAuthenticator.java:40) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:54) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:47) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.SaslAuthenticator.doAsSubject(SaslAuthenticator.java:179) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.SaslAuthenticator.authenticate(SaslAuthenticator.java:47) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.InternalStreamConnectionInitializer.authenticateAll(InternalStreamConnectionInitializer.java:156) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.InternalStreamConnectionInitializer.initialize(InternalStreamConnectionInitializer.java:63) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.InternalStreamConnection.open(InternalStreamConnection.java:129) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.UsageTrackingInternalConnection.open(UsageTrackingInternalConnection.java:50) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.DefaultConnectionPool$PooledConnection.open(DefaultConnectionPool.java:398) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.DefaultConnectionPool.get(DefaultConnectionPool.java:115) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.DefaultConnectionPool.get(DefaultConnectionPool.java:101) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.internal.connection.DefaultServer.getConnection(DefaultServer.java:92) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.binding.ClusterBinding$ClusterBindingConnectionSource.getConnection(ClusterBinding.java:126) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.operation.OperationHelper.withReleasableConnection(OperationHelper.java:501) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:196) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:71) ~[mongodb-driver-core-3.11.2.jar:na]
	at com.mongodb.client.internal.MongoClientDelegate$DelegateOperationExecutor.execute(MongoClientDelegate.java:206) ~[mongodb-driver-3.11.2.jar:na]
	at com.mongodb.client.internal.MongoCollectionImpl.executeInsertMany(MongoCollectionImpl.java:524) ~[mongodb-driver-3.11.2.jar:na]
	at com.mongodb.client.internal.MongoCollectionImpl.insertMany(MongoCollectionImpl.java:508) ~[mongodb-driver-3.11.2.jar:na]
	at com.mongodb.client.internal.MongoCollectionImpl.insertMany(MongoCollectionImpl.java:503) ~[mongodb-driver-3.11.2.jar:na]
	at org.springframework.data.mongodb.core.MongoTemplate.lambda$insertDocumentList$17(MongoTemplate.java:1526) ~[spring-data-mongodb-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.data.mongodb.core.MongoTemplate.execute(MongoTemplate.java:585) ~[spring-data-mongodb-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.data.mongodb.core.MongoTemplate.insertDocumentList(MongoTemplate.java:1519) ~[spring-data-mongodb-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.data.mongodb.core.MongoTemplate.doInsertBatch(MongoTemplate.java:1384) ~[spring-data-mongodb-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.data.mongodb.core.MongoTemplate.doInsertAll(MongoTemplate.java:1353) ~[spring-data-mongodb-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.data.mongodb.core.MongoTemplate.insertAll(MongoTemplate.java:1326) ~[spring-data-mongodb-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.data.mongodb.repository.support.SimpleMongoRepository.insert(SimpleMongoRepository.java:272) ~[spring-data-mongodb-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_191]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_191]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_191]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_191]
	at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:371) ~[spring-data-commons-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:204) ~[spring-data-commons-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:657) ~[spring-data-commons-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:621) ~[spring-data-commons-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:605) ~[spring-data-commons-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:80) ~[spring-data-commons-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95) ~[spring-aop-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at com.sun.proxy.$Proxy65.insert(Unknown Source) ~[na:na]
	at com.study.chapter0602.controller.BookController.test1(BookController.java:35) ~[classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_191]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_191]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_191]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_191]
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_191]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_191]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_191]
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经过检查，是由于自己账号输错了，与MongoDB中创建的用户不一致，导致认证错误，application.properties中内容如下：

#表示验证登录信息的库
spring.data.mongodb.authentication-database=admin
#表示要连接的库
spring.data.mongodb.database=test
spring.data.mongodb.host=192.168.64.128
spring.data.mongodb.port=27017
spring.data.mongodb.username= =sang
spring.data.mongodb.password=123
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不知道时候在用户名那儿多敲了一个“=”，去掉“=”之后，问题解决。
所以提醒在读人和自己，敲代码也要仔细检查，不然会浪费更多属于自己的时间。