问题：
SpringBoot项目报警告：Cannot find template location(s): [classpath:/templates/] (please add some templates, check your FreeMarker configuration, or set spring.freemarker.checkTemplateLocation=false)，具体如下：
"E:\Program Files (x86)\Java\jdk1.8.0_131\bin\java.exe" -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:63720,suspend=y,server=n -javaagent:C:\Users\liumin\.IdeaIC2019.1\system\captureAgent\debugger-agent.jar -Dfile.encoding=UTF-8 -classpath "E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\charsets.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\deploy.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\ext\access-bridge-64.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\ext\cldrdata.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\ext\dnsns.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\ext\jaccess.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\ext\jfxrt.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\ext\localedata.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\ext\nashorn.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\ext\sunec.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\ext\sunjce_provider.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\ext\sunmscapi.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\ext\sunpkcs11.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\ext\zipfs.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\javaws.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\jce.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\jfr.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\jfxswt.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\jsse.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\management-agent.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\plugin.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\resources.jar;E:\Program Files (x86)\Java\jdk1.8.0_131\jre\lib\rt.jar;F:\IdeaProjects\yd_bigdata\day19\springboot-security-mybaits\target\classes;C:\Users\liumin\.m2\repository\org\springframework\boot\spring-boot-starter-security\2.1.7.RELEASE\spring-boot-starter-security-2.1.7.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\boot\spring-boot-starter\2.1.7.RELEASE\spring-boot-starter-2.1.7.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.1.7.RELEASE\spring-boot-starter-logging-2.1.7.RELEASE.jar;C:\Users\liumin\.m2\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;C:\Users\liumin\.m2\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;C:\Users\liumin\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.11.2\log4j-to-slf4j-2.11.2.jar;C:\Users\liumin\.m2\repository\org\apache\logging\log4j\log4j-api\2.11.2\log4j-api-2.11.2.jar;C:\Users\liumin\.m2\repository\org\slf4j\jul-to-slf4j\1.7.26\jul-to-slf4j-1.7.26.jar;C:\Users\liumin\.m2\repository\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;C:\Users\liumin\.m2\repository\org\yaml\snakeyaml\1.23\snakeyaml-1.23.jar;C:\Users\liumin\.m2\repository\org\springframework\spring-aop\5.1.9.RELEASE\spring-aop-5.1.9.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\spring-beans\5.1.9.RELEASE\spring-beans-5.1.9.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\security\spring-security-config\5.1.6.RELEASE\spring-security-config-5.1.6.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\spring-context\5.1.9.RELEASE\spring-context-5.1.9.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\security\spring-security-web\5.1.6.RELEASE\spring-security-web-5.1.6.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\spring-expression\5.1.9.RELEASE\spring-expression-5.1.9.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.1.7.RELEASE\spring-boot-starter-web-2.1.7.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.1.7.RELEASE\spring-boot-starter-json-2.1.7.RELEASE.jar;C:\Users\liumin\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.9.9\jackson-databind-2.9.9.jar;C:\Users\liumin\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;C:\Users\liumin\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.9.9\jackson-core-2.9.9.jar;C:\Users\liumin\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.9\jackson-datatype-jdk8-2.9.9.jar;C:\Users\liumin\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.9\jackson-datatype-jsr310-2.9.9.jar;C:\Users\liumin\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.9\jackson-module-parameter-names-2.9.9.jar;C:\Users\liumin\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.1.7.RELEASE\spring-boot-starter-tomcat-2.1.7.RELEASE.jar;C:\Users\liumin\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.22\tomcat-embed-core-9.0.22.jar;C:\Users\liumin\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.22\tomcat-embed-el-9.0.22.jar;C:\Users\liumin\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.22\tomcat-embed-websocket-9.0.22.jar;C:\Users\liumin\.m2\repository\org\hibernate\validator\hibernate-validator\6.0.17.Final\hibernate-validator-6.0.17.Final.jar;C:\Users\liumin\.m2\repository\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;C:\Users\liumin\.m2\repository\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;C:\Users\liumin\.m2\repository\com\fasterxml\classmate\1.4.0\classmate-1.4.0.jar;C:\Users\liumin\.m2\repository\org\springframework\spring-web\5.1.9.RELEASE\spring-web-5.1.9.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\spring-webmvc\5.1.9.RELEASE\spring-webmvc-5.1.9.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\boot\spring-boot-starter-freemarker\2.1.7.RELEASE\spring-boot-starter-freemarker-2.1.7.RELEASE.jar;C:\Users\liumin\.m2\repository\org\freemarker\freemarker\2.3.28\freemarker-2.3.28.jar;C:\Users\liumin\.m2\repository\org\springframework\spring-context-support\5.1.9.RELEASE\spring-context-support-5.1.9.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\boot\spring-boot-devtools\2.1.7.RELEASE\spring-boot-devtools-2.1.7.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\boot\spring-boot\2.1.7.RELEASE\spring-boot-2.1.7.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.1.7.RELEASE\spring-boot-autoconfigure-2.1.7.RELEASE.jar;C:\Users\liumin\.m2\repository\org\projectlombok\lombok\1.18.8\lombok-1.18.8.jar;C:\Users\liumin\.m2\repository\org\springframework\spring-core\5.1.9.RELEASE\spring-core-5.1.9.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\spring-jcl\5.1.9.RELEASE\spring-jcl-5.1.9.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\security\spring-security-core\5.1.6.RELEASE\spring-security-core-5.1.6.RELEASE.jar;C:\Users\liumin\.m2\repository\org\mybatis\spring\boot\mybatis-spring-boot-starter\1.3.2\mybatis-spring-boot-starter-1.3.2.jar;C:\Users\liumin\.m2\repository\org\springframework\boot\spring-boot-starter-jdbc\2.1.7.RELEASE\spring-boot-starter-jdbc-2.1.7.RELEASE.jar;C:\Users\liumin\.m2\repository\com\zaxxer\HikariCP\3.2.0\HikariCP-3.2.0.jar;C:\Users\liumin\.m2\repository\org\springframework\spring-jdbc\5.1.9.RELEASE\spring-jdbc-5.1.9.RELEASE.jar;C:\Users\liumin\.m2\repository\org\springframework\spring-tx\5.1.9.RELEASE\spring-tx-5.1.9.RELEASE.jar;C:\Users\liumin\.m2\repository\org\mybatis\spring\boot\mybatis-spring-boot-autoconfigure\1.3.2\mybatis-spring-boot-autoconfigure-1.3.2.jar;C:\Users\liumin\.m2\repository\org\mybatis\mybatis\3.4.6\mybatis-3.4.6.jar;C:\Users\liumin\.m2\repository\org\mybatis\mybatis-spring\1.3.2\mybatis-spring-1.3.2.jar;C:\Users\liumin\.m2\repository\com\alibaba\druid-spring-boot-starter\1.1.10\druid-spring-boot-starter-1.1.10.jar;C:\Users\liumin\.m2\repository\com\alibaba\druid\1.1.10\druid-1.1.10.jar;C:\Users\liumin\.m2\repository\org\slf4j\slf4j-api\1.7.26\slf4j-api-1.7.26.jar;C:\Users\liumin\.m2\repository\mysql\mysql-connector-java\5.1.44\mysql-connector-java-5.1.44.jar;E:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 2019.1.3\lib\idea_rt.jar" com.lm.springboot.SpringbootSecurityMybaitsApplication
Connected to the target VM, address: '127.0.0.1:63720', transport: 'socket'
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.7.RELEASE)
2020-02-13 17:45:54.750 INFO 21256 --- [ restartedMain] p.s.SpringbootSecurityMybaitsApplication : Starting SpringbootSecurityMybaitsApplication on DESKTOP-4JO626E with PID 21256 (F:\IdeaProjects\yd_bigdata\day19\springboot-security-mybaits\target\classes started by liumin in F:\IdeaProjects\yd_bigdata\day19\springboot-security-mybaits)
2020-02-13 17:45:54.760 INFO 21256 --- [ restartedMain] p.s.SpringbootSecurityMybaitsApplication : No active profile set, falling back to default profiles: default
2020-02-13 17:45:54.861 INFO 21256 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2020-02-13 17:45:54.861 INFO 21256 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2020-02-13 17:45:57.767 INFO 21256 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-02-13 17:45:57.807 INFO 21256 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-02-13 17:45:57.807 INFO 21256 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.22]
2020-02-13 17:45:58.037 INFO 21256 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-02-13 17:45:58.037 INFO 21256 --- [ restartedMain] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 3176 ms
2020-02-13 17:45:58.226 INFO 21256 --- [ restartedMain] c.a.d.s.b.a.DruidDataSourceAutoConfigure : Init DruidDataSource
2020-02-13 17:45:58.356 INFO 21256 --- [ restartedMain] com.alibaba.druid.pool.DruidDataSource : {dataSource-1} inited
Thu Feb 13 17:46:01 CST 2020 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
2020-02-13 17:46:01.974 INFO 21256 --- [ restartedMain] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: any request, [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@6b2b4374, org.springframework.security.web.context.SecurityContextPersistenceFilter@65915dbf, org.springframework.security.web.header.HeaderWriterFilter@1455a976, org.springframework.security.web.authentication.logout.LogoutFilter@163f2ef2, org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter@56ce00f1, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@26d8718a, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@168f2d1a, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@6823ef17, org.springframework.security.web.session.SessionManagementFilter@7a43e3fb, org.springframework.security.web.access.ExceptionTranslationFilter@951b1b3, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@608a5ff9]
2020-02-13 17:46:02.184 INFO 21256 --- [ restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-02-13 17:46:02.425 WARN 21256 --- [ restartedMain] o.s.b.a.f.FreeMarkerAutoConfiguration : Cannot find template location(s): [classpath:/templates/] (please add some templates, check your FreeMarker configuration, or set spring.freemarker.checkTemplateLocation=false)
2020-02-13 17:46:02.527 INFO 21256 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729
2020-02-13 17:46:02.587 INFO 21256 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2020-02-13 17:46:02.597 INFO 21256 --- [ restartedMain] p.s.SpringbootSecurityMybaitsApplication : Started SpringbootSecurityMybaitsApplication in 8.268 seconds (JVM running for 9.091)
解决方案：
在application.properties文件里面添加如下：
spring.freemarker.checkTemplateLocation=false