第一节，创建第一个springboot项目

 .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.0.4.RELEASE)

2018-08-09 12:06:20.958  INFO 11480 --- [           main] com.dencycheng.demo1.Demo1Application    : Starting Demo1Application on dell-PC with PID 11480 (E:\ideaWork\demo1\target\classes started by dell in E:\ideaWork\demo1)
2018-08-09 12:06:20.985  INFO 11480 --- [           main] com.dencycheng.demo1.Demo1Application    : No active profile set, falling back to default profiles: default
2018-08-09 12:06:21.319  INFO 11480 --- [           main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@2fd6b6c7: startup date [Thu Aug 09 12:06:21 CST 2018]; root of context hierarchy
2018-08-09 12:06:23.291  INFO 11480 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2018-08-09 12:06:23.328  INFO 11480 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2018-08-09 12:06:23.329  INFO 11480 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.32
2018-08-09 12:06:23.342  INFO 11480 --- [ost-startStop-1] 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: [D:\java\jdk\jdk\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;D:\java\jdk\jdk\bin;D:\java\jdk\jdk\jre\bin;C:\Users\dell\AppData\Local\Programs\Python\Python36-32;D:\java\maven\apache-maven-3.2.5\bin;D:\tools\Git\cmd;D:\tools\mysql-5.7.20-winx64\bin;D:\tools\node\;D:\java\android-sdk\android-sdk-windows\platform-tools;D:\java\android-sdk\android-sdk-windows\tools;D:\java\gradle-4.8-rc-2-bin\gradle-4.8-rc-2\bin;C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\;D:\tools\sqlserver2008\100\Tools\Binn\;D:\tools\sqlserver2008\100\DTS\Binn\;C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\;C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE\PrivateAssemblies\;C:\Program Files (x86)\Microsoft SQL Server\100\DTS\Binn\;D:\tools\Microsoft VS Code\bin;C:\Users\dell\AppData\Local\Programs\Python\Python36-32\Scripts\;C:\Users\dell\AppData\Local\Programs\Python\Python36-32\;C:\Users\dell\AppData\Roaming\npm;D:\tools\Microsoft VS Code\bin;.]
2018-08-09 12:06:23.693  INFO 11480 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2018-08-09 12:06:23.693  INFO 11480 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2441 ms
2018-08-09 12:06:23.753  INFO 11480 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [/]
2018-08-09 12:06:23.758  INFO 11480 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-08-09 12:06:23.758  INFO 11480 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-08-09 12:06:23.758  INFO 11480 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-08-09 12:06:23.758  INFO 11480 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2018-08-09 12:06:23.871  INFO 11480 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-08-09 12:06:24.102  INFO 11480 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@2fd6b6c7: startup date [Thu Aug 09 12:06:21 CST 2018]; root of context hierarchy
2018-08-09 12:06:24.154  INFO 11480 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-08-09 12:06:24.155  INFO 11480 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-08-09 12:06:24.175  INFO 11480 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-08-09 12:06:24.176  INFO 11480 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-08-09 12:06:24.292  INFO 11480 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2018-08-09 12:06:24.392  INFO 11480 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2018-08-09 12:06:24.397  INFO 11480 --- [           main] com.dencycheng.demo1.Demo1Application    : Started Demo1Application in 4.925 seconds (JVM running for 10.043)