以前项目可以正常运行。
今天重新打开项目运行，出现了下面异常：
23:56:12.102 [main] DEBUG org.springframework.boot.context.logging.ClasspathLoggingApplicationListener - Application failed to start with classpath: [file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/charsets.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/deploy.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/ext/access-bridge-64.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/ext/cldrdata.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/ext/dnsns.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/ext/jaccess.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/ext/jfxrt.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/ext/localedata.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/ext/nashorn.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/ext/sunec.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/ext/sunjce_provider.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/ext/sunmscapi.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/ext/sunpkcs11.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/ext/zipfs.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/javaws.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/jce.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/jfr.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/jfxswt.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/jsse.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/management-agent.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/plugin.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/resources.jar, file:/F:/Install/JavaJDK/JDKInstall/jdk1.8.0_181/jre/lib/rt.jar, file:/F:/Install/CompilerWorkspace/IDEA2/mybatis/springboot_mybatis/target/classes/, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/boot/spring-boot-starter-web/2.1.0.RELEASE/spring-boot-starter-web-2.1.0.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/boot/spring-boot-starter/2.1.0.RELEASE/spring-boot-starter-2.1.0.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/boot/spring-boot/2.1.0.RELEASE/spring-boot-2.1.0.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/boot/spring-boot-autoconfigure/2.1.0.RELEASE/spring-boot-autoconfigure-2.1.0.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/boot/spring-boot-starter-logging/2.1.0.RELEASE/spring-boot-starter-logging-2.1.0.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/ch/qos/logback/logback-core/1.2.3/logback-core-1.2.3.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/apache/logging/log4j/log4j-to-slf4j/2.11.1/log4j-to-slf4j-2.11.1.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/apache/logging/log4j/log4j-api/2.11.1/log4j-api-2.11.1.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/slf4j/jul-to-slf4j/1.7.25/jul-to-slf4j-1.7.25.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/javax/annotation/javax.annotation-api/1.3.2/javax.annotation-api-1.3.2.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/yaml/snakeyaml/1.23/snakeyaml-1.23.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/boot/spring-boot-starter-json/2.1.0.RELEASE/spring-boot-starter-json-2.1.0.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/com/fasterxml/jackson/core/jackson-databind/2.9.7/jackson-databind-2.9.7.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/com/fasterxml/jackson/core/jackson-annotations/2.9.0/jackson-annotations-2.9.0.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/com/fasterxml/jackson/core/jackson-core/2.9.7/jackson-core-2.9.7.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/com/fasterxml/jackson/datatype/jackson-datatype-jdk8/2.9.7/jackson-datatype-jdk8-2.9.7.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/com/fasterxml/jackson/datatype/jackson-datatype-jsr310/2.9.7/jackson-datatype-jsr310-2.9.7.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/com/fasterxml/jackson/module/jackson-module-parameter-names/2.9.7/jackson-module-parameter-names-2.9.7.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/boot/spring-boot-starter-tomcat/2.1.0.RELEASE/spring-boot-starter-tomcat-2.1.0.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/apache/tomcat/embed/tomcat-embed-core/9.0.12/tomcat-embed-core-9.0.12.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/apache/tomcat/embed/tomcat-embed-el/9.0.12/tomcat-embed-el-9.0.12.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/apache/tomcat/embed/tomcat-embed-websocket/9.0.12/tomcat-embed-websocket-9.0.12.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/hibernate/validator/hibernate-validator/6.0.13.Final/hibernate-validator-6.0.13.Final.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/javax/validation/validation-api/2.0.1.Final/validation-api-2.0.1.Final.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/jboss/logging/jboss-logging/3.3.2.Final/jboss-logging-3.3.2.Final.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/com/fasterxml/classmate/1.4.0/classmate-1.4.0.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/spring-web/5.1.2.RELEASE/spring-web-5.1.2.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/spring-beans/5.1.2.RELEASE/spring-beans-5.1.2.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/spring-webmvc/5.1.2.RELEASE/spring-webmvc-5.1.2.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/spring-aop/5.1.2.RELEASE/spring-aop-5.1.2.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/spring-context/5.1.2.RELEASE/spring-context-5.1.2.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/spring-expression/5.1.2.RELEASE/spring-expression-5.1.2.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/mybatis/spring/boot/mybatis-spring-boot-starter/1.3.2/mybatis-spring-boot-starter-1.3.2.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/boot/spring-boot-starter-jdbc/2.1.0.RELEASE/spring-boot-starter-jdbc-2.1.0.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/com/zaxxer/HikariCP/3.2.0/HikariCP-3.2.0.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/spring-jdbc/5.1.2.RELEASE/spring-jdbc-5.1.2.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/spring-tx/5.1.2.RELEASE/spring-tx-5.1.2.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/mybatis/spring/boot/mybatis-spring-boot-autoconfigure/1.3.2/mybatis-spring-boot-autoconfigure-1.3.2.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/mybatis/mybatis/3.4.6/mybatis-3.4.6.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/mybatis/mybatis-spring/1.3.2/mybatis-spring-1.3.2.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/mysql/mysql-connector-java/8.0.13/mysql-connector-java-8.0.13.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/slf4j/slf4j-api/1.7.25/slf4j-api-1.7.25.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/spring-core/5.1.2.RELEASE/spring-core-5.1.2.RELEASE.jar, file:/F:/Install/Apache/apache-maven-3.5.4/repository/org/springframework/spring-jcl/5.1.2.RELEASE/spring-jcl-5.1.2.RELEASE.jar, file:/F:/Install/CompilerInstall/IntelliJ%20IDEA%202018.2.4/lib/idea_rt.jar]
23:56:12.672 [background-preinit] DEBUG org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator - Loaded expression factory via original TCCL
23:56:12.692 [background-preinit] DEBUG org.hibernate.validator.internal.engine.ValidatorFactoryImpl - HV000234: Using org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator as ValidatorFactory-scoped message interpolator.
23:56:12.692 [background-preinit] DEBUG org.hibernate.validator.internal.engine.ValidatorFactoryImpl - HV000234: Using org.hibernate.validator.internal.engine.resolver.TraverseAllTraversableResolver as ValidatorFactory-scoped traversable resolver.
23:56:12.692 [background-preinit] DEBUG org.hibernate.validator.internal.engine.ValidatorFactoryImpl - HV000234: Using org.hibernate.validator.internal.util.ExecutableParameterNameProvider as ValidatorFactory-scoped parameter name provider.
23:56:12.692 [background-preinit] DEBUG org.hibernate.validator.internal.engine.ValidatorFactoryImpl - HV000234: Using org.hibernate.validator.internal.engine.DefaultClockProvider as ValidatorFactory-scoped clock provider.
23:56:12.692 [background-preinit] DEBUG org.hibernate.validator.internal.engine.ValidatorFactoryImpl - HV000234: Using org.hibernate.validator.internal.engine.scripting.DefaultScriptEvaluatorFactory as ValidatorFactory-scoped script evaluator factory.
23:56:13.637 [main] ERROR org.springframework.boot.SpringApplication - Application run failed
java.lang.IllegalStateException: Failed to load property source from location 'classpath:/application.yml'
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:554)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadForFileExtension(ConfigFileApplicationListener.java:500)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:467)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$null$6(ConfigFileApplicationListener.java:448)
at java.lang.Iterable.forEach(Iterable.java:75)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$load$7(ConfigFileApplicationListener.java:447)
at java.lang.Iterable.forEach(Iterable.java:75)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:444)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:332)
at org.springframework.boot.context.config.ConfigFileApplicationListener.addPropertySources(ConfigFileApplicationListener.java:207)
at org.springframework.boot.context.config.ConfigFileApplicationListener.postProcessEnvironment(ConfigFileApplicationListener.java:190)
at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEnvironmentPreparedEvent(ConfigFileApplicationListener.java:177)
at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEvent(ConfigFileApplicationListener.java:163)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)
at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:75)
at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54)
at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:347)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:306)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
at com.kaven.springboot_mybatis.SpringbootMybatisApplication.main(SpringbootMybatisApplication.java:12)
Caused by: org.yaml.snakeyaml.error.YAMLException: java.nio.charset.MalformedInputException: Input length = 1
at org.yaml.snakeyaml.reader.StreamReader.update(StreamReader.java:218)
at org.yaml.snakeyaml.reader.StreamReader.ensureEnoughData(StreamReader.java:176)
at org.yaml.snakeyaml.reader.StreamReader.ensureEnoughData(StreamReader.java:171)
at org.yaml.snakeyaml.reader.StreamReader.peek(StreamReader.java:126)
at org.yaml.snakeyaml.scanner.ScannerImpl.scanToNextToken(ScannerImpl.java:1177)
at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:287)
at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:227)
at org.yaml.snakeyaml.parser.ParserImpl$ParseImplicitDocumentStart.produce(ParserImpl.java:195)
at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:158)
at org.yaml.snakeyaml.parser.ParserImpl.checkEvent(ParserImpl.java:148)
at org.yaml.snakeyaml.composer.Composer.checkNode(Composer.java:72)
at org.yaml.snakeyaml.constructor.BaseConstructor.checkData(BaseConstructor.java:112)
at org.yaml.snakeyaml.Yaml$1.hasNext(Yaml.java:542)
at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:161)
at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:134)
at org.springframework.boot.env.OriginTrackedYamlLoader.load(OriginTrackedYamlLoader.java:75)
at org.springframework.boot.env.YamlPropertySourceLoader.load(YamlPropertySourceLoader.java:50)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadDocuments(ConfigFileApplicationListener.java:572)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:526)
... 23 common frames omitted
Caused by: java.nio.charset.MalformedInputException: Input length = 1
at java.nio.charset.CoderResult.throwException(CoderResult.java:281)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:339)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at org.yaml.snakeyaml.reader.UnicodeReader.read(UnicodeReader.java:125)
at org.yaml.snakeyaml.reader.StreamReader.update(StreamReader.java:183)
... 41 common frames omitted
异常信息很明显，问题在 yml 文件上。
application.yml 如下：
server:
port: 8080
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/kaven?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=GMT-8
username: root
mybatis:
mapper-locations: classpath:mapper/*.xml
#中文
type-aliases-package: com.kaven.springboot_mybatis.domin #中文
百度了很多博客，基本上都是说注释要用 #，而不是 // 这个问题。
但是我用的就是 # 啊。
还有就是空格的问题 ，按照博客说的要求我重新敲了一遍。
不过还是出现上面的异常。
经过很多次测试，把 yml 文件中的注释改成非中文就能正常运行了。
application.yml 如下：
server:
port: 8080
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/kaven?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=GMT-8
username: root
mybatis:
mapper-locations: classpath:mapper/*.xml
#1
type-aliases-package: com.kaven.springboot_mybatis.domin #1
运行结果如下：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.0.RELEASE)
2018-11-19 00:10:40.868 INFO 7624 --- [ main] c.k.s.SpringbootMybatisApplication : Starting SpringbootMybatisApplication on DESKTOP-1EB3JGB with PID 7624 (F:\Install\CompilerWorkspace\IDEA2\mybatis\springboot_mybatis\target\classes started by Kaven in F:\Install\CompilerWorkspace\IDEA2\mybatis\springboot_mybatis)
2018-11-19 00:10:40.878 INFO 7624 --- [ main] c.k.s.SpringbootMybatisApplication : No active profile set, falling back to default profiles: default
2018-11-19 00:10:43.941 INFO 7624 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-11-19 00:10:43.971 INFO 7624 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-11-19 00:10:43.971 INFO 7624 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/9.0.12
2018-11-19 00:10:43.981 INFO 7624 --- [ main] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\bin;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\bin;F:\Install\Apache\apache-tomcat-9.0.12\lib;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\MySQL\MySQL Utilities 1.6\;F:\Install\Apache\apache-maven-3.5.4\bin;C:\Program Files\MySQL\MySQL Server 5.7\bin;F:\Install\web\nodejsInstall\;F:\Install\VersionControlSystem\GitInstall\Git\cmd;F:\Install\DataBase\RedisInstall;C:\Users\Kaven\AppData\Local\Microsoft\WindowsApps;C:\Users\Kaven\AppData\Roaming\npm;.]
2018-11-19 00:10:44.171 INFO 7624 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-11-19 00:10:44.171 INFO 7624 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 3104 ms
2018-11-19 00:10:44.252 INFO 7624 --- [ main] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-11-19 00:10:44.260 INFO 7624 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-11-19 00:10:44.261 INFO 7624 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-11-19 00:10:44.261 INFO 7624 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'formContentFilter' to: [/*]
2018-11-19 00:10:44.261 INFO 7624 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-11-19 00:10:44.899 INFO 7624 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2018-11-19 00:10:45.432 INFO 7624 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-11-19 00:10:45.442 INFO 7624 --- [ main] c.k.s.SpringbootMybatisApplication : Started SpringbootMybatisApplication in 5.68 seconds (JVM running for 9.352)
但是我们平时还是习惯用中文注释怎么办呢？不可能改变习惯吧。
既然是 yml 文件出的问题，并且是跟中文问题相关，一般就是 yml 文件编码格式的问题了，我觉得把 yml 文件的编码格式改成 utf-8就可以了。
改编码格式之前，最好还是先把 yml 文件的中文先删掉，改了编码格式再重新复制上去，我之前没有删掉中文，就不允许我改编码格式，我指的是我下面说的这种情况，而不是设置 File Encodings，好像设置 File Encodings 并没有起作用，我不知道下面的设置和设置 File Encodings 有什么区别，有知道的大佬，可以留言告知一下。
编译器下方
重启编译器，这种设置会保留，不会又恢复默认设置。
这样设置对于我这个小项目有效，不确保对任何情况都有效。
application.yml 如下：
server:
port: 8080
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/kaven?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=GMT-8
username: root
mybatis:
mapper-locations: classpath:mapper/*.xml
#中文
type-aliases-package: com.kaven.springboot_mybatis.domin #中文
程序启动成功：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.0.RELEASE)
2018-11-19 00:30:38.943 INFO 6268 --- [ main] c.k.s.SpringbootMybatisApplication : Starting SpringbootMybatisApplication on DESKTOP-1EB3JGB with PID 6268 (F:\Install\CompilerWorkspace\IDEA2\mybatis\springboot_mybatis\target\classes started by Kaven in F:\Install\CompilerWorkspace\IDEA2\mybatis\springboot_mybatis)
2018-11-19 00:30:38.955 INFO 6268 --- [ main] c.k.s.SpringbootMybatisApplication : No active profile set, falling back to default profiles: default
2018-11-19 00:30:42.656 INFO 6268 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-11-19 00:30:42.685 INFO 6268 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-11-19 00:30:42.685 INFO 6268 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/9.0.12
2018-11-19 00:30:42.695 INFO 6268 --- [ main] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\bin;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\bin;F:\Install\Apache\apache-tomcat-9.0.12\lib;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\MySQL\MySQL Utilities 1.6\;F:\Install\Apache\apache-maven-3.5.4\bin;C:\Program Files\MySQL\MySQL Server 5.7\bin;F:\Install\web\nodejsInstall\;F:\Install\VersionControlSystem\GitInstall\Git\cmd;F:\Install\DataBase\RedisInstall;C:\Users\Kaven\AppData\Local\Microsoft\WindowsApps;C:\Users\Kaven\AppData\Roaming\npm;.]
2018-11-19 00:30:42.939 INFO 6268 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-11-19 00:30:42.939 INFO 6268 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 3791 ms
2018-11-19 00:30:42.989 INFO 6268 --- [ main] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-11-19 00:30:42.989 INFO 6268 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-11-19 00:30:42.989 INFO 6268 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-11-19 00:30:42.989 INFO 6268 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'formContentFilter' to: [/*]
2018-11-19 00:30:42.989 INFO 6268 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-11-19 00:30:43.732 INFO 6268 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2018-11-19 00:30:44.397 INFO 6268 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-11-19 00:30:44.397 INFO 6268 --- [ main] c.k.s.SpringbootMybatisApplication : Started SpringbootMybatisApplication in 7.068 seconds (JVM running for 10.137)
对于我这个小项目，yml 文件中的中文问题暂时算是解决了（不知道以后会不会还有 bug）。
设置 File Encodings :
我全部设置为 utf-8 都没有用。
要是有说错的地方，请大家不吝赐教。