spring boot 的web项目

墨蓝 2022-10-31 14:57 104阅读 0赞

spring boot web修改完类或者配置之后，通常需要重新部署之后才能生效，如果每次都手动运行非常不方便，，幸好spring boot提供了spring-boot-devtools，它能在修改类或者配置文件的时候自动重新加载spring boot应用，当然首先要在pom文件的

dependencies标签里

中添加如下依赖

<dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-devtools</artifactId>
             <optional>true</optional>
    </dependency>

然后修改类或者配置文件，观察控制台日志，正常应该重启，例如下面是我本机修改某类之后控制台新输出的内容

2021-02-23 10:59:56.936  INFO 17284 --- [      Thread-36] ConfigServletWebServerApplicationContext : Closing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@ef64958: startup date [Tue Feb 23 10:53:19 CST 2021]; root of context hierarchy
    2021-02-23 10:59:56.938  INFO 17284 --- [      Thread-36] o.s.j.e.a.AnnotationMBeanExporter        : Unregistering JMX-exposed beans on shutdown
    
      .   ____          _            __ _ _
     /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
    ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
     \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
      '  |____| .__|_| |_|_| |_\__, | / / / /
     =========|_|==============|___/=/_/_/_/
     :: Spring Boot ::        (v2.0.0.RELEASE)
    
    2021-02-23 10:59:57.636  INFO 17284 --- [  restartedMain] com.bee.sample.ch1.Ch1Application        : Starting Ch1Application on DESKTOP-LOQT6LN with PID 17284 (started by 35725 in E:\idea_project\工具类\springboot\Spring-Boot-2.0-Samples\1_preface\ch1.helloword)
    2021-02-23 10:59:57.636  INFO 17284 --- [  restartedMain] com.bee.sample.ch1.Ch1Application        : No active profile set, falling back to default profiles: default
    2021-02-23 10:59:57.638  INFO 17284 --- [  restartedMain] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@3b39f9cc: startup date [Tue Feb 23 10:59:57 CST 2021]; root of context hierarchy
    2021-02-23 10:59:58.122 ERROR 17284 --- [  restartedMain] o.a.catalina.core.AprLifecycleListener   : An incompatible version [1.2.5] of the APR based Apache Tomcat Native library is installed, while Tomcat requires version [1.2.14]
    2021-02-23 10:59:58.175  INFO 17284 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
    2021-02-23 10:59:58.176 ERROR 17284 --- [  restartedMain] o.a.catalina.core.AprLifecycleListener   : An incompatible version [1.2.5] of the APR based Apache Tomcat Native library is installed, while Tomcat requires version [1.2.14]
    2021-02-23 10:59:58.176  INFO 17284 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
    2021-02-23 10:59:58.177  INFO 17284 --- [  restartedMain] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.28
    2021-02-23 10:59:58.178 ERROR 17284 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener   : An incompatible version [1.2.5] of the APR based Apache Tomcat Native library is installed, while Tomcat requires version [1.2.14]
    2021-02-23 10:59:58.197  INFO 17284 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
    2021-02-23 10:59:58.197  INFO 17284 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 559 ms
    2021-02-23 10:59:58.449  INFO 17284 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [/]
    2021-02-23 10:59:58.449  INFO 17284 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
    2021-02-23 10:59:58.450  INFO 17284 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
    2021-02-23 10:59:58.450  INFO 17284 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
    2021-02-23 10:59:58.450  INFO 17284 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
    2021-02-23 10:59:58.450  INFO 17284 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpTraceFilter' to: [/*]
    2021-02-23 10:59:58.450  INFO 17284 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'webMvcMetricsFilter' to: [/*]
    2021-02-23 10:59:58.582  INFO 17284 --- [  restartedMain] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@3b39f9cc: startup date [Tue Feb 23 10:59:57 CST 2021]; root of context hierarchy
    2021-02-23 10:59:58.594  INFO 17284 --- [  restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/say.html]}" onto public java.lang.String com.bee.sample.ch1.controller.HelloworldController.say(java.lang.String)
    2021-02-23 10:59:58.595  INFO 17284 --- [  restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/usercredit/{id}]}" onto public java.lang.Integer com.bee.sample.ch1.rest.UserReditRestController.getCreditLevel(java.lang.String)
    2021-02-23 10:59:58.597  INFO 17284 --- [  restartedMain] 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)
    2021-02-23 10:59:58.598  INFO 17284 --- [  restartedMain] 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)
    2021-02-23 10:59:58.617  INFO 17284 --- [  restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
    2021-02-23 10:59:58.617  INFO 17284 --- [  restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
    2021-02-23 10:59:58.634  INFO 17284 --- [  restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
    2021-02-23 10:59:58.764  INFO 17284 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
    2021-02-23 10:59:58.776  INFO 17284 --- [  restartedMain] s.b.a.e.w.s.WebMvcEndpointHandlerMapping : Mapped "{[/actuator/health],methods=[GET],produces=[application/vnd.spring-boot.actuator.v2+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.web.servlet.AbstractWebMvcEndpointHandlerMapping$OperationHandler.handle(javax.servlet.http.HttpServletRequest,java.util.Map<java.lang.String, java.lang.String>)
    2021-02-23 10:59:58.776  INFO 17284 --- [  restartedMain] s.b.a.e.w.s.WebMvcEndpointHandlerMapping : Mapped "{[/actuator/info],methods=[GET],produces=[application/vnd.spring-boot.actuator.v2+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.web.servlet.AbstractWebMvcEndpointHandlerMapping$OperationHandler.handle(javax.servlet.http.HttpServletRequest,java.util.Map<java.lang.String, java.lang.String>)
    2021-02-23 10:59:58.777  INFO 17284 --- [  restartedMain] s.b.a.e.w.s.WebMvcEndpointHandlerMapping : Mapped "{[/actuator],methods=[GET],produces=[application/vnd.spring-boot.actuator.v2+json || application/json]}" onto protected java.util.Map<java.lang.String, java.util.Map<java.lang.String, org.springframework.boot.actuate.endpoint.web.Link>> org.springframework.boot.actuate.endpoint.web.servlet.WebMvcEndpointHandlerMapping.links(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
    2021-02-23 10:59:58.845  INFO 17284 --- [  restartedMain] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
    2021-02-23 10:59:58.860  INFO 17284 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
    2021-02-23 10:59:58.861  INFO 17284 --- [  restartedMain] com.bee.sample.ch1.Ch1Application        : Started Ch1Application in 1.245 seconds (JVM running for 663.929)
    2021-02-23 10:59:58.863  INFO 17284 --- [  restartedMain] .ConditionEvaluationDeltaLoggingListener : Condition evaluation unchanged

需要注意一下内容

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pwMzU3MjUyNTM5_size_16_color_FFFFFF_t_70][]

![20210223110905359.png][]

如果没有输出，可能没有配置代码更新后自动保存，自动编译，例如我的IDE工具**IDEA,**还需要做如下配置**File——>Settings**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pwMzU3MjUyNTM5_size_16_color_FFFFFF_t_70 1][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pwMzU3MjUyNTM5_size_16_color_FFFFFF_t_70]: /images/20221024/808e0fc0425a4307b5164ca01ea512e8.png
[20210223110905359.png]: /images/20221024/791cd774a05346c2b000744cd36ee6ec.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pwMzU3MjUyNTM5_size_16_color_FFFFFF_t_70 1]: /images/20221024/8624f31367b24ca1a6dae10315f8c21b.png