一、如图所示进行创建，一路next
二、创建完成后的项目结构（拉红线的是我写的测试，大家略过）
三、启动试试(右键run，或者唯一的java类内的小绿三角点击启动，或者使用快捷键)
五、成功后的日志（经典Spring拼图，需要关注的是默认是8080端口）
D:\work\Java\jdk-8u191-windows-x64\bin\java.exe -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=65044 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Djava.rmi.server.hostname=localhost -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:D:\work\IntelliJ IDEA 2018.3.2\lib\idea_rt.jar=65045:D:\work\IntelliJ IDEA 2018.3.2\bin" -Dfile.encoding=UTF-8 -classpath D:\work\Java\jdk-8u191-windows-x64\jre\lib\charsets.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\deploy.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\ext\access-bridge-64.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\ext\cldrdata.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\ext\dnsns.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\ext\jaccess.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\ext\jfxrt.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\ext\localedata.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\ext\nashorn.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\ext\sunec.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\ext\sunjce_provider.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\ext\sunmscapi.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\ext\sunpkcs11.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\ext\zipfs.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\javaws.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\jce.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\jfr.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\jfxswt.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\jsse.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\management-agent.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\plugin.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\resources.jar;D:\work\Java\jdk-8u191-windows-x64\jre\lib\rt.jar;D:\workspaces\demo\target\classes;E:\M2\repository\org\springframework\boot\spring-boot-starter-data-redis\2.3.1.RELEASE\spring-boot-starter-data-redis-2.3.1.RELEASE.jar;E:\M2\repository\org\springframework\boot\spring-boot-starter\2.3.1.RELEASE\spring-boot-starter-2.3.1.RELEASE.jar;E:\M2\repository\org\springframework\boot\spring-boot-starter-logging\2.3.1.RELEASE\spring-boot-starter-logging-2.3.1.RELEASE.jar;E:\M2\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;E:\M2\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;E:\M2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.13.3\log4j-to-slf4j-2.13.3.jar;E:\M2\repository\org\apache\logging\log4j\log4j-api\2.13.3\log4j-api-2.13.3.jar;E:\M2\repository\org\slf4j\jul-to-slf4j\1.7.30\jul-to-slf4j-1.7.30.jar;E:\M2\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;E:\M2\repository\org\yaml\snakeyaml\1.26\snakeyaml-1.26.jar;E:\M2\repository\org\springframework\data\spring-data-redis\2.3.1.RELEASE\spring-data-redis-2.3.1.RELEASE.jar;E:\M2\repository\org\springframework\data\spring-data-keyvalue\2.3.1.RELEASE\spring-data-keyvalue-2.3.1.RELEASE.jar;E:\M2\repository\org\springframework\data\spring-data-commons\2.3.1.RELEASE\spring-data-commons-2.3.1.RELEASE.jar;E:\M2\repository\org\springframework\spring-tx\5.2.7.RELEASE\spring-tx-5.2.7.RELEASE.jar;E:\M2\repository\org\springframework\spring-oxm\5.2.7.RELEASE\spring-oxm-5.2.7.RELEASE.jar;E:\M2\repository\org\springframework\spring-aop\5.2.7.RELEASE\spring-aop-5.2.7.RELEASE.jar;E:\M2\repository\org\springframework\spring-context-support\5.2.7.RELEASE\spring-context-support-5.2.7.RELEASE.jar;E:\M2\repository\org\slf4j\slf4j-api\1.7.30\slf4j-api-1.7.30.jar;E:\M2\repository\io\lettuce\lettuce-core\5.3.1.RELEASE\lettuce-core-5.3.1.RELEASE.jar;E:\M2\repository\io\netty\netty-common\4.1.50.Final\netty-common-4.1.50.Final.jar;E:\M2\repository\io\netty\netty-handler\4.1.50.Final\netty-handler-4.1.50.Final.jar;E:\M2\repository\io\netty\netty-resolver\4.1.50.Final\netty-resolver-4.1.50.Final.jar;E:\M2\repository\io\netty\netty-buffer\4.1.50.Final\netty-buffer-4.1.50.Final.jar;E:\M2\repository\io\netty\netty-codec\4.1.50.Final\netty-codec-4.1.50.Final.jar;E:\M2\repository\io\netty\netty-transport\4.1.50.Final\netty-transport-4.1.50.Final.jar;E:\M2\repository\org\springframework\boot\spring-boot-starter-web\2.3.1.RELEASE\spring-boot-starter-web-2.3.1.RELEASE.jar;E:\M2\repository\org\springframework\boot\spring-boot-starter-json\2.3.1.RELEASE\spring-boot-starter-json-2.3.1.RELEASE.jar;E:\M2\repository\com\fasterxml\jackson\core\jackson-databind\2.11.0\jackson-databind-2.11.0.jar;E:\M2\repository\com\fasterxml\jackson\core\jackson-annotations\2.11.0\jackson-annotations-2.11.0.jar;E:\M2\repository\com\fasterxml\jackson\core\jackson-core\2.11.0\jackson-core-2.11.0.jar;E:\M2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.11.0\jackson-datatype-jdk8-2.11.0.jar;E:\M2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.11.0\jackson-datatype-jsr310-2.11.0.jar;E:\M2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.11.0\jackson-module-parameter-names-2.11.0.jar;E:\M2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.3.1.RELEASE\spring-boot-starter-tomcat-2.3.1.RELEASE.jar;E:\M2\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.36\tomcat-embed-core-9.0.36.jar;E:\M2\repository\org\glassfish\jakarta.el\3.0.3\jakarta.el-3.0.3.jar;E:\M2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.36\tomcat-embed-websocket-9.0.36.jar;E:\M2\repository\org\springframework\spring-web\5.2.7.RELEASE\spring-web-5.2.7.RELEASE.jar;E:\M2\repository\org\springframework\spring-beans\5.2.7.RELEASE\spring-beans-5.2.7.RELEASE.jar;E:\M2\repository\org\springframework\spring-webmvc\5.2.7.RELEASE\spring-webmvc-5.2.7.RELEASE.jar;E:\M2\repository\org\springframework\spring-context\5.2.7.RELEASE\spring-context-5.2.7.RELEASE.jar;E:\M2\repository\org\springframework\spring-expression\5.2.7.RELEASE\spring-expression-5.2.7.RELEASE.jar;E:\M2\repository\org\springframework\boot\spring-boot-devtools\2.3.1.RELEASE\spring-boot-devtools-2.3.1.RELEASE.jar;E:\M2\repository\org\springframework\boot\spring-boot\2.3.1.RELEASE\spring-boot-2.3.1.RELEASE.jar;E:\M2\repository\org\springframework\boot\spring-boot-autoconfigure\2.3.1.RELEASE\spring-boot-autoconfigure-2.3.1.RELEASE.jar;E:\M2\repository\org\springframework\spring-core\5.2.7.RELEASE\spring-core-5.2.7.RELEASE.jar;E:\M2\repository\org\springframework\spring-jcl\5.2.7.RELEASE\spring-jcl-5.2.7.RELEASE.jar;E:\M2\repository\io\projectreactor\reactor-core\3.3.6.RELEASE\reactor-core-3.3.6.RELEASE.jar;E:\M2\repository\org\reactivestreams\reactive-streams\1.0.3\reactive-streams-1.0.3.jar com.example.demo.DemoApplication
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.3.1.RELEASE)
2020-06-23 18:38:35.741 INFO 9296 --- [ restartedMain] com.example.demo.DemoApplication : Starting DemoApplication on PC-20180617ZGXJ with PID 9296 (D:\workspaces\demo\target\classes started by Administrator in D:\workspaces\demo)
2020-06-23 18:38:35.746 INFO 9296 --- [ restartedMain] com.example.demo.DemoApplication : No active profile set, falling back to default profiles: default
2020-06-23 18:38:35.871 INFO 9296 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2020-06-23 18:38:35.871 INFO 9296 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2020-06-23 18:38:38.339 INFO 9296 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2020-06-23 18:38:38.342 INFO 9296 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data Redis repositories in DEFAULT mode.
2020-06-23 18:38:38.374 INFO 9296 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 17ms. Found 0 Redis repository interfaces.
2020-06-23 18:38:39.046 INFO 9296 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-06-23 18:38:39.061 INFO 9296 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-06-23 18:38:39.062 INFO 9296 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.36]
2020-06-23 18:38:39.230 INFO 9296 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-06-23 18:38:39.231 INFO 9296 --- [ restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 3359 ms
2020-06-23 18:38:39.705 INFO 9296 --- [ restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-06-23 18:38:39.936 INFO 9296 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729
2020-06-23 18:38:40.107 INFO 9296 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2020-06-23 18:38:40.120 INFO 9296 --- [ restartedMain] com.example.demo.DemoApplication : Started DemoApplication in 4.988 seconds (JVM running for 6.435)
六、创建第一个Hello World（File——Java Class）
七、成功如图：
八、编写一个简单的HelloWorld方法
九、再次启动项目，在浏览器输入URL
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